[syzbot] [media?] KASAN: slab-use-after-free Write in media_request_alloc

[syzbot] [media?] KASAN: slab-use-after-free Write in media_request_alloc

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    c875a6c32467 Merge tag 'usb-6.19-rc3' of git://git.kernel...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1395e49a580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=513255d80ab78f2b
dashboard link: https://syzkaller.appspot.com/bug?extid=2bf29e42be0666f2df70
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1795e49a580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-c875a6c3.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a757db7716a5/vmlinux-c875a6c3.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3095f726e048/bzImage-c875a6c3.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2bf29e42be0666f2df70@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: slab-use-after-free in vsnprintf+0x38b/0xee0 lib/vsprintf.c:2898
Write of size 1 at addr ffff888042136c11 by task syz.4.761/7191

CPU: 0 UID: 0 PID: 7191 Comm: syz.4.761 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xca/0x240 mm/kasan/report.c:482
 kasan_report+0x118/0x150 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x2b0/0x2c0 mm/kasan/generic.c:200
 __asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106
 vsnprintf+0x38b/0xee0 lib/vsprintf.c:2898
 snprintf+0xda/0x120 lib/vsprintf.c:3041
 media_request_alloc+0x319/0x5b0 drivers/media/mc/mc-request.c:320
 media_device_request_alloc+0x98/0xd0 drivers/media/mc/mc-device.c:380
 media_device_ioctl+0x278/0x430 drivers/media/mc/mc-device.c:465
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f801458f7c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f801547d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f80147e5fa0 RCX: 00007f801458f7c9
RDX: 0000000000000000 RSI: 0000000080047c05 RDI: 0000000000000003
RBP: 00007f8014613f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f80147e6038 R14: 00007f80147e5fa0 R15: 00007ffd838327f8
 </TASK>

Allocated by task 7191:
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
 poison_kmalloc_redzone mm/kasan/common.c:397 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:414
 kasan_kmalloc include/linux/kasan.h:262 [inline]
 __kmalloc_cache_noprof+0x3e2/0x700 mm/slub.c:5776
 kmalloc_noprof include/linux/slab.h:957 [inline]
 kzalloc_noprof include/linux/slab.h:1094 [inline]
 media_request_alloc+0xe4/0x5b0 drivers/media/mc/mc-request.c:294
 media_device_request_alloc+0x98/0xd0 drivers/media/mc/mc-device.c:380
 media_device_ioctl+0x278/0x430 drivers/media/mc/mc-device.c:465
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 7194:
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:252 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284
 kasan_slab_free include/linux/kasan.h:234 [inline]
 slab_free_hook mm/slub.c:2540 [inline]
 slab_free mm/slub.c:6670 [inline]
 kfree+0x1c0/0x660 mm/slub.c:6878
 media_request_close+0x38/0x50 drivers/media/mc/mc-request.c:89
 __fput+0x44c/0xa70 fs/file_table.c:468
 task_work_run+0x1d4/0x260 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:44 [inline]
 exit_to_user_mode_loop+0xef/0x4e0 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x2b7/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888042136c00
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 17 bytes inside of
 freed 256-byte region [ffff888042136c00, ffff888042136d00)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x42136
flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 04fff00000000000 ffff88801a441b40 ffffea000105e940 dead000000000008
raw: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 6435, tgid 6433 (syz.5.390), ts 150606964609, free_ts 150605503050
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x234/0x290 mm/page_alloc.c:1846
 prep_new_page mm/page_alloc.c:1854 [inline]
 get_page_from_freelist+0x24e0/0x2580 mm/page_alloc.c:3915
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5210
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486
 alloc_slab_page mm/slub.c:3075 [inline]
 allocate_slab+0x86/0x3b0 mm/slub.c:3248
 new_slab mm/slub.c:3302 [inline]
 ___slab_alloc+0xe53/0x1820 mm/slub.c:4656
 __slab_alloc+0x65/0x100 mm/slub.c:4779
 __slab_alloc_node mm/slub.c:4855 [inline]
 slab_alloc_node mm/slub.c:5251 [inline]
 __kmalloc_cache_noprof+0x41e/0x700 mm/slub.c:5771
 kmalloc_noprof include/linux/slab.h:957 [inline]
 kzalloc_noprof include/linux/slab.h:1094 [inline]
 media_request_alloc+0xe4/0x5b0 drivers/media/mc/mc-request.c:294
 media_device_request_alloc+0x98/0xd0 drivers/media/mc/mc-device.c:380
 media_device_ioctl+0x278/0x430 drivers/media/mc/mc-device.c:465
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 5325 tgid 5325 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 __free_frozen_pages+0xbc8/0xd30 mm/page_alloc.c:2943
 __tlb_remove_table_free mm/mmu_gather.c:227 [inline]
 tlb_remove_table_rcu+0x85/0x100 mm/mmu_gather.c:290
 rcu_do_batch kernel/rcu/tree.c:2605 [inline]
 rcu_core+0xc8e/0x1720 kernel/rcu/tree.c:2857
 handle_softirqs+0x22b/0x7c0 kernel/softirq.c:622
 do_softirq+0x76/0xd0 kernel/softirq.c:523
 __local_bh_enable_ip+0xf8/0x130 kernel/softirq.c:450
 lock_sock include/net/sock.h:1700 [inline]
 tcp_sendmsg+0x21/0x50 net/ipv4/tcp.c:1411
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg+0x19c/0x270 net/socket.c:742
 sock_write_iter+0x279/0x360 net/socket.c:1195
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888042136b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888042136b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888042136c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                         ^
 ffff888042136c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888042136d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================


---
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Re: [syzbot] [media?] KASAN: slab-use-after-free Write in media_request_alloc

[Hillf Danton]

> Date: Thu, 01 Jan 2026 19:38:23 -0800
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    c875a6c32467 Merge tag 'usb-6.19-rc3' of git://git.kernel...
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=1395e49a580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=513255d80ab78f2b
> dashboard link: https://syzkaller.appspot.com/bug?extid=2bf29e42be0666f2df70
> compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1795e49a580000
> 
> Downloadable assets:
> disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-c875a6c3.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/a757db7716a5/vmlinux-c875a6c3.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/3095f726e048/bzImage-c875a6c3.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+2bf29e42be0666f2df70@syzkaller.appspotmail.com
> 
> ==================================================================
> BUG: KASAN: slab-use-after-free in vsnprintf+0x38b/0xee0 lib/vsprintf.c:2898
> Write of size 1 at addr ffff888042136c11 by task syz.4.761/7191
> 
> CPU: 0 UID: 0 PID: 7191 Comm: syz.4.761 Not tainted syzkaller #0 PREEMPT(full) 
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
> Call Trace:
>  <TASK>
>  dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
>  print_address_description mm/kasan/report.c:378 [inline]
>  print_report+0xca/0x240 mm/kasan/report.c:482
>  kasan_report+0x118/0x150 mm/kasan/report.c:595
>  check_region_inline mm/kasan/generic.c:-1 [inline]
>  kasan_check_range+0x2b0/0x2c0 mm/kasan/generic.c:200
>  __asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106
>  vsnprintf+0x38b/0xee0 lib/vsprintf.c:2898
>  snprintf+0xda/0x120 lib/vsprintf.c:3041
>  media_request_alloc+0x319/0x5b0 drivers/media/mc/mc-request.c:320
>  media_device_request_alloc+0x98/0xd0 drivers/media/mc/mc-device.c:380
>  media_device_ioctl+0x278/0x430 drivers/media/mc/mc-device.c:465
>  vfs_ioctl fs/ioctl.c:51 [inline]

What is difficult to understand is why file is closed while ioctl does not finish.

>  __do_sys_ioctl fs/ioctl.c:597 [inline]
>  __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
>  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
>  do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7f801458f7c9
> Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007f801547d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
> RAX: ffffffffffffffda RBX: 00007f80147e5fa0 RCX: 00007f801458f7c9
> RDX: 0000000000000000 RSI: 0000000080047c05 RDI: 0000000000000003
> RBP: 00007f8014613f91 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
> R13: 00007f80147e6038 R14: 00007f80147e5fa0 R15: 00007ffd838327f8
>  </TASK>
> 
> Allocated by task 7191:
>  kasan_save_stack mm/kasan/common.c:56 [inline]
>  kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
>  poison_kmalloc_redzone mm/kasan/common.c:397 [inline]
>  __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:414
>  kasan_kmalloc include/linux/kasan.h:262 [inline]
>  __kmalloc_cache_noprof+0x3e2/0x700 mm/slub.c:5776
>  kmalloc_noprof include/linux/slab.h:957 [inline]
>  kzalloc_noprof include/linux/slab.h:1094 [inline]
>  media_request_alloc+0xe4/0x5b0 drivers/media/mc/mc-request.c:294
>  media_device_request_alloc+0x98/0xd0 drivers/media/mc/mc-device.c:380
>  media_device_ioctl+0x278/0x430 drivers/media/mc/mc-device.c:465
>  vfs_ioctl fs/ioctl.c:51 [inline]
>  __do_sys_ioctl fs/ioctl.c:597 [inline]
>  __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
>  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
>  do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
> 
> Freed by task 7194:
>  kasan_save_stack mm/kasan/common.c:56 [inline]
>  kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
>  kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
>  poison_slab_object mm/kasan/common.c:252 [inline]
>  __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284
>  kasan_slab_free include/linux/kasan.h:234 [inline]
>  slab_free_hook mm/slub.c:2540 [inline]
>  slab_free mm/slub.c:6670 [inline]
>  kfree+0x1c0/0x660 mm/slub.c:6878
>  media_request_close+0x38/0x50 drivers/media/mc/mc-request.c:89
>  __fput+0x44c/0xa70 fs/file_table.c:468
>  task_work_run+0x1d4/0x260 kernel/task_work.c:233
>  resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
>  __exit_to_user_mode_loop kernel/entry/common.c:44 [inline]
>  exit_to_user_mode_loop+0xef/0x4e0 kernel/entry/common.c:75
>  __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
>  syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
>  syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
>  syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
>  do_syscall_64+0x2b7/0xf80 arch/x86/entry/syscall_64.c:100
>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
> 
> The buggy address belongs to the object at ffff888042136c00
>  which belongs to the cache kmalloc-256 of size 256
> The buggy address is located 17 bytes inside of
>  freed 256-byte region [ffff888042136c00, ffff888042136d00)
> 
> The buggy address belongs to the physical page:
> page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x42136
> flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff)
> page_type: f5(slab)
> raw: 04fff00000000000 ffff88801a441b40 ffffea000105e940 dead000000000008
> raw: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000
> page dumped because: kasan: bad access detected
> page_owner tracks the page as allocated
> page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 6435, tgid 6433 (syz.5.390), ts 150606964609, free_ts 150605503050
>  set_page_owner include/linux/page_owner.h:32 [inline]
>  post_alloc_hook+0x234/0x290 mm/page_alloc.c:1846
>  prep_new_page mm/page_alloc.c:1854 [inline]
>  get_page_from_freelist+0x24e0/0x2580 mm/page_alloc.c:3915
>  __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5210
>  alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486
>  alloc_slab_page mm/slub.c:3075 [inline]
>  allocate_slab+0x86/0x3b0 mm/slub.c:3248
>  new_slab mm/slub.c:3302 [inline]
>  ___slab_alloc+0xe53/0x1820 mm/slub.c:4656
>  __slab_alloc+0x65/0x100 mm/slub.c:4779
>  __slab_alloc_node mm/slub.c:4855 [inline]
>  slab_alloc_node mm/slub.c:5251 [inline]
>  __kmalloc_cache_noprof+0x41e/0x700 mm/slub.c:5771
>  kmalloc_noprof include/linux/slab.h:957 [inline]
>  kzalloc_noprof include/linux/slab.h:1094 [inline]
>  media_request_alloc+0xe4/0x5b0 drivers/media/mc/mc-request.c:294
>  media_device_request_alloc+0x98/0xd0 drivers/media/mc/mc-device.c:380
>  media_device_ioctl+0x278/0x430 drivers/media/mc/mc-device.c:465
>  vfs_ioctl fs/ioctl.c:51 [inline]
>  __do_sys_ioctl fs/ioctl.c:597 [inline]
>  __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
>  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
>  do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
> page last free pid 5325 tgid 5325 stack trace:
>  reset_page_owner include/linux/page_owner.h:25 [inline]
>  free_pages_prepare mm/page_alloc.c:1395 [inline]
>  __free_frozen_pages+0xbc8/0xd30 mm/page_alloc.c:2943
>  __tlb_remove_table_free mm/mmu_gather.c:227 [inline]
>  tlb_remove_table_rcu+0x85/0x100 mm/mmu_gather.c:290
>  rcu_do_batch kernel/rcu/tree.c:2605 [inline]
>  rcu_core+0xc8e/0x1720 kernel/rcu/tree.c:2857
>  handle_softirqs+0x22b/0x7c0 kernel/softirq.c:622
>  do_softirq+0x76/0xd0 kernel/softirq.c:523
>  __local_bh_enable_ip+0xf8/0x130 kernel/softirq.c:450
>  lock_sock include/net/sock.h:1700 [inline]
>  tcp_sendmsg+0x21/0x50 net/ipv4/tcp.c:1411
>  sock_sendmsg_nosec net/socket.c:727 [inline]
>  __sock_sendmsg+0x19c/0x270 net/socket.c:742
>  sock_write_iter+0x279/0x360 net/socket.c:1195
>  new_sync_write fs/read_write.c:593 [inline]
>  vfs_write+0x5c9/0xb30 fs/read_write.c:686
>  ksys_write+0x145/0x250 fs/read_write.c:738
>  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
>  do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
> 
> Memory state around the buggy address:
>  ffff888042136b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>  ffff888042136b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> >ffff888042136c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>                          ^
>  ffff888042136c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>  ffff888042136d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> ==================================================================

Forwarded: #syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git b69053dd3ffbc0d2dedbbc86182cdef6f641fe1b

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com.

***

Subject: #syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git b69053dd3ffbc0d2dedbbc86182cdef6f641fe1b
Author: dmantipov@yandex.ru

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git b69053dd3ffbc0d2dedbbc86182cdef6f641fe1b

Forwarded: #syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git b69053dd3ffbc0d2dedbbc86182cdef6f641fe1b

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com.

***

Subject: #syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git b69053dd3ffbc0d2dedbbc86182cdef6f641fe1b
Author: dmantipov@yandex.ru

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git b69053dd3ffbc0d2dedbbc86182cdef6f641fe1b

Re: [syzbot] [media?] KASAN: slab-use-after-free Write in media_request_alloc

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+2bf29e42be0666f2df70@syzkaller.appspotmail.com
Tested-by: syzbot+2bf29e42be0666f2df70@syzkaller.appspotmail.com

Tested on:

commit:         b69053dd wifi: mt76: Remove blank line after mt792x fi..
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=14dcbfb4580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=513255d80ab78f2b
dashboard link: https://syzkaller.appspot.com/bug?extid=2bf29e42be0666f2df70
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=15ccbfb4580000

Note: testing is done by a robot and is best-effort only.

Forwarded: KASAN: slab-use-after-free Write in media_request_alloc

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org.

***

Subject: KASAN: slab-use-after-free Write in media_request_alloc
Author: mfo@igalia.com

#syz test git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git a260bd22a355

Re: [syzbot] [media?] KASAN: slab-use-after-free Write in media_request_alloc

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

0c03 length: 249 > 1
[  106.253750][ T4683] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[  106.257543][ T4683] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[  106.268568][ T4683] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[  106.271990][ T4683] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[  106.576059][  T951] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[  106.580308][  T951] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
[  106.963685][ T5367] syz-executor (5367) used greatest stack depth: 18056 bytes left
[  108.328157][ T4683] Bluetooth: hci0: command tx timeout
[  109.621987][ T5393] chnl_net:caif_netlink_parms(): no params data found
[  109.891390][ T5393] bridge0: port 1(bridge_slave_0) entered blocking state
[  109.895644][ T5393] bridge0: port 1(bridge_slave_0) entered disabled state
[  109.909027][ T5393] bridge_slave_0: entered allmulticast mode
[  109.919263][ T5393] bridge_slave_0: entered promiscuous mode
[  109.931659][ T5393] bridge0: port 2(bridge_slave_1) entered blocking state
[  109.945562][ T5393] bridge0: port 2(bridge_slave_1) entered disabled state
[  109.949131][ T5393] bridge_slave_1: entered allmulticast mode
[  109.958653][ T5393] bridge_slave_1: entered promiscuous mode
[  110.046797][ T5393] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[  110.073157][ T5393] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[  110.135915][ T5393] team0: Port device team_slave_0 added
[  110.146251][ T5393] team0: Port device team_slave_1 added
[  110.206774][ T5393] batman_adv: batadv0: Adding interface: batadv_slave_0
[  110.228265][ T5393] batman_adv: batadv0: The MTU of interface batadv_slave_0 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1532 would solve the problem.
[  110.264469][ T5393] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[  110.282476][ T5393] batman_adv: batadv0: Adding interface: batadv_slave_1
[  110.285647][ T5393] batman_adv: batadv0: The MTU of interface batadv_slave_1 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1532 would solve the problem.
[  110.318910][ T5393] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[  110.384477][ T5393] hsr_slave_0: entered promiscuous mode
[  110.398136][ T4683] Bluetooth: hci0: command tx timeout
[  110.401229][ T5393] hsr_slave_1: entered promiscuous mode
[  110.714539][ T5393] netdevsim netdevsim4 netdevsim0: renamed from eth0
[  110.750233][ T5393] netdevsim netdevsim4 netdevsim1: renamed from eth1
[  110.769066][ T5393] netdevsim netdevsim4 netdevsim2: renamed from eth2
[  110.782144][ T5393] netdevsim netdevsim4 netdevsim3: renamed from eth3
[  110.922207][ T5393] 8021q: adding VLAN 0 to HW filter on device bond0
[  110.963107][ T5393] 8021q: adding VLAN 0 to HW filter on device team0
[  110.980705][ T1043] bridge0: port 1(bridge_slave_0) entered blocking state
[  110.983983][ T1043] bridge0: port 1(bridge_slave_0) entered forwarding state
[  111.004797][ T1043] bridge0: port 2(bridge_slave_1) entered blocking state
[  111.007951][ T1043] bridge0: port 2(bridge_slave_1) entered forwarding state
[  111.291338][ T5393] 8021q: adding VLAN 0 to HW filter on device batadv0
[  111.494424][ T5393] veth0_vlan: entered promiscuous mode
[  111.504047][ T5393] veth1_vlan: entered promiscuous mode
[  111.530824][ T5393] veth0_macvtap: entered promiscuous mode
[  111.537212][ T5393] veth1_macvtap: entered promiscuous mode
[  111.553943][ T5393] batman_adv: batadv0: Interface activated: batadv_slave_0
[  111.566659][ T5393] batman_adv: batadv0: Interface activated: batadv_slave_1
[  111.577390][ T1043] netdevsim netdevsim4 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[  111.586923][ T1043] netdevsim netdevsim4 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[  111.603357][ T1043] netdevsim netdevsim4 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[  111.608797][   T31] netdevsim netdevsim4 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
2026/02/26 15:42:15 executed programs: 0
[  111.847365][   T46] Bluetooth: hci1: unexpected cc 0x0c03 length: 249 > 1
[  111.853330][   T46] Bluetooth: hci1: unexpected cc 0x1003 length: 249 > 9
[  111.856528][   T46] Bluetooth: hci1: unexpected cc 0x1001 length: 249 > 9
[  111.860446][   T46] Bluetooth: hci1: unexpected cc 0x0c23 length: 249 > 4
[  111.863901][   T46] Bluetooth: hci1: unexpected cc 0x0c38 length: 249 > 2
[  112.198358][ T5455] chnl_net:caif_netlink_parms(): no params data found
[  112.267661][ T5455] bridge0: port 1(bridge_slave_0) entered blocking state
[  112.271489][ T5455] bridge0: port 1(bridge_slave_0) entered disabled state
[  112.274573][ T5455] bridge_slave_0: entered allmulticast mode
[  112.279376][ T5455] bridge_slave_0: entered promiscuous mode
[  112.283631][ T5455] bridge0: port 2(bridge_slave_1) entered blocking state
[  112.286737][ T5455] bridge0: port 2(bridge_slave_1) entered disabled state
[  112.290395][ T5455] bridge_slave_1: entered allmulticast mode
[  112.294412][ T5455] bridge_slave_1: entered promiscuous mode
[  112.316604][ T5455] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[  112.341890][ T5455] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[  112.393270][ T5455] team0: Port device team_slave_0 added
[  112.409121][ T5455] team0: Port device team_slave_1 added
[  112.458152][ T5455] batman_adv: batadv0: Adding interface: batadv_slave_0
[  112.461130][ T5455] batman_adv: batadv0: The MTU of interface batadv_slave_0 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1532 would solve the problem.
[  112.478873][   T46] Bluetooth: hci0: command tx timeout
[  112.488075][ T5455] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[  112.499491][ T5455] batman_adv: batadv0: Adding interface: batadv_slave_1
[  112.502401][ T5455] batman_adv: batadv0: The MTU of interface batadv_slave_1 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1532 would solve the problem.
[  112.529001][ T5455] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[  112.605799][ T5455] hsr_slave_0: entered promiscuous mode
[  112.609713][ T5455] hsr_slave_1: entered promiscuous mode
[  112.612785][ T5455] debugfs: 'hsr0' already exists in 'hsr'
[  112.615353][ T5455] Cannot create hsr debugfs directory
[  112.771926][ T5455] netdevsim netdevsim0 netdevsim0: renamed from eth0
[  112.783380][ T5455] netdevsim netdevsim0 netdevsim1: renamed from eth1
[  112.791273][ T5455] netdevsim netdevsim0 netdevsim2: renamed from eth2
[  112.797627][ T5455] netdevsim netdevsim0 netdevsim3: renamed from eth3
[  112.875456][ T5455] 8021q: adding VLAN 0 to HW filter on device bond0
[  112.896056][ T5455] 8021q: adding VLAN 0 to HW filter on device team0
[  112.904713][ T3999] bridge0: port 1(bridge_slave_0) entered blocking state
[  112.908134][ T3999] bridge0: port 1(bridge_slave_0) entered forwarding state
[  112.919758][  T951] bridge0: port 2(bridge_slave_1) entered blocking state
[  112.923095][  T951] bridge0: port 2(bridge_slave_1) entered forwarding state
[  113.112452][ T5455] 8021q: adding VLAN 0 to HW filter on device batadv0
[  113.155690][ T5455] veth0_vlan: entered promiscuous mode
[  113.164569][ T5455] veth1_vlan: entered promiscuous mode
[  113.190733][ T5455] veth0_macvtap: entered promiscuous mode
[  113.197471][ T5455] veth1_macvtap: entered promiscuous mode
[  113.215022][ T5455] batman_adv: batadv0: Interface activated: batadv_slave_0
[  113.226089][ T5455] batman_adv: batadv0: Interface activated: batadv_slave_1
[  113.234855][   T31] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[  113.244504][   T31] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[  113.255609][   T31] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[  113.292821][   T31] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[  113.359090][  T951] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[  113.362546][  T951] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[  113.429892][   T31] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[  113.433619][   T31] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
SYZFAIL: failed to recv rpc
fd=3 want=4 recv=0 n=0 (errno 9: Bad file descriptor)
[  114.122967][ T1043] netdevsim netdevsim4 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[  114.429752][ T1043] netdevsim netdevsim4 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[  114.483912][ T1043] netdevsim netdevsim4 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[  114.549421][ T1043] netdevsim netdevsim4 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[  114.761462][ T1043] bridge_slave_1: left allmulticast mode
[  114.764161][ T1043] bridge_slave_1: left promiscuous mode
[  114.767497][ T1043] bridge0: port 2(bridge_slave_1) entered disabled state
[  114.802242][ T1043] bridge_slave_0: left allmulticast mode
[  114.804855][ T1043] bridge_slave_0: left promiscuous mode
[  114.807653][ T1043] bridge0: port 1(bridge_slave_0) entered disabled state
[  115.196541][ T1043] bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
[  115.203611][ T1043] bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
[  115.210418][ T1043] bond0 (unregistering): Released all slaves
[  115.367021][ T1043] hsr_slave_0: left promiscuous mode
[  115.388260][ T1043] hsr_slave_1: left promiscuous mode
[  115.391568][ T1043] batman_adv: batadv0: Interface deactivated: batadv_slave_0
[  115.394769][ T1043] batman_adv: batadv0: Removing interface: batadv_slave_0
[  115.413510][ T1043] batman_adv: batadv0: Interface deactivated: batadv_slave_1
[  115.416877][ T1043] batman_adv: batadv0: Removing interface: batadv_slave_1
[  115.453664][ T1043] veth1_macvtap: left promiscuous mode
[  115.456467][ T1043] veth0_macvtap: left promiscuous mode
[  115.464776][ T1043] veth1_vlan: left promiscuous mode
[  115.466936][ T1043] veth0_vlan: left promiscuous mode
[  115.943578][ T1043] team0 (unregistering): Port device team_slave_1 removed
[  115.984498][ T1043] team0 (unregistering): Port device team_slave_0 removed
[  116.563465][ T1043] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[  116.715509][ T1043] netdevsim netdevsim0 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[  116.787744][ T1043] netdevsim netdevsim0 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[  116.860315][ T1043] netdevsim netdevsim0 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[  117.037674][ T1043] bridge_slave_1: left allmulticast mode
[  117.051515][ T1043] bridge_slave_1: left promiscuous mode
[  117.054331][ T1043] bridge0: port 2(bridge_slave_1) entered disabled state
[  117.070719][ T1043] bridge_slave_0: left allmulticast mode
[  117.073222][ T1043] bridge_slave_0: left promiscuous mode
[  117.075883][ T1043] bridge0: port 1(bridge_slave_0) entered disabled state
[  117.470534][ T1043] bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
[  117.476031][ T1043] bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
[  117.483636][ T1043] bond0 (unregistering): Released all slaves
[  117.741781][ T1043] hsr_slave_0: left promiscuous mode
[  117.744650][ T1043] hsr_slave_1: left promiscuous mode
[  117.747513][ T1043] batman_adv: batadv0: Interface deactivated: batadv_slave_0
[  117.762774][ T1043] batman_adv: batadv0: Removing interface: batadv_slave_0
[  117.778823][ T1043] batman_adv: batadv0: Interface deactivated: batadv_slave_1
[  117.782013][ T1043] batman_adv: batadv0: Removing interface: batadv_slave_1
[  117.792752][ T1043] veth1_macvtap: left promiscuous mode
[  117.795248][ T1043] veth0_macvtap: left promiscuous mode
[  117.797711][ T1043] veth1_vlan: left promiscuous mode
[  117.818197][ T1043] veth0_vlan: left promiscuous mode
[  118.255958][ T1043] team0 (unregistering): Port device team_slave_1 removed
[  118.280291][ T1043] team0 (unregistering): Port device team_slave_0 removed


syzkaller build log:
go env (err=<nil>)
AR='ar'
CC='gcc'
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_ENABLED='1'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
CXX='g++'
GCCGO='gccgo'
GO111MODULE='auto'
GOAMD64='v1'
GOARCH='amd64'
GOAUTH='netrc'
GOBIN=''
GOCACHE='/syzkaller/.cache/go-build'
GOCACHEPROG=''
GODEBUG=''
GOENV='/syzkaller/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFIPS140='off'
GOFLAGS=''
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build3231907968=/tmp/go-build -gno-record-gcc-switches'
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMOD='/syzkaller/jobs/linux/gopath/src/github.com/google/syzkaller/go.mod'
GOMODCACHE='/syzkaller/jobs/linux/gopath/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/syzkaller/jobs/linux/gopath'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTELEMETRY='local'
GOTELEMETRYDIR='/syzkaller/.config/go/telemetry'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.24.4'
GOWORK=''
PKG_CONFIG='pkg-config'

git status (err=<nil>)
HEAD detached at d1b870e1003b
nothing to commit, working tree clean


tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
go list -f '{{.Stale}}' -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=d1b870e1003b52891d2196c1e2ee42fe905010ba -X github.com/google/syzkaller/prog.gitRevisionDate=20251128-125159"  ./sys/syz-sysgen | grep -q false || go install -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=d1b870e1003b52891d2196c1e2ee42fe905010ba -X github.com/google/syzkaller/prog.gitRevisionDate=20251128-125159"  ./sys/syz-sysgen
make .descriptions
tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
bin/syz-sysgen
touch .descriptions
GOOS=linux GOARCH=amd64 go build -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=d1b870e1003b52891d2196c1e2ee42fe905010ba -X github.com/google/syzkaller/prog.gitRevisionDate=20251128-125159"  -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
mkdir -p ./bin/linux_amd64
g++ -o ./bin/linux_amd64/syz-executor executor/executor.cc \
	-m64 -O2 -pthread -Wall -Werror -Wparentheses -Wunused-const-variable -Wframe-larger-than=16384 -Wno-stringop-overflow -Wno-array-bounds -Wno-format-overflow -Wno-unused-but-set-variable -Wno-unused-command-line-argument -static-pie -std=c++17 -I. -Iexecutor/_include   -DGOOS_linux=1 -DGOARCH_amd64=1 \
	-DHOSTGOOS_linux=1 -DGIT_REVISION=\"d1b870e1003b52891d2196c1e2ee42fe905010ba\"
/usr/bin/ld: /tmp/cczH2ZJp.o: in function `Connection::Connect(char const*, char const*)':
executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEPKcS1_]+0x386): warning: Using 'gethostbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
./tools/check-syzos.sh 2>/dev/null


Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=1721a006580000


Tested on:

commit:         a260bd22 media: mc: fix potential use-after-free in me..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel config:  https://syzkaller.appspot.com/x/.config?x=42a29b5eebe67b17
dashboard link: https://syzkaller.appspot.com/bug?extid=2bf29e42be0666f2df70
compiler:       Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8

Note: no patches were applied.

Forwarded: KASAN: slab-use-after-free Write in media_request_alloc

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org.

***

Subject: KASAN: slab-use-after-free Write in media_request_alloc
Author: mfo@igalia.com

#syz test git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git a260bd22a355

Re: [syzbot] [media?] KASAN: slab-use-after-free Write in media_request_alloc

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+2bf29e42be0666f2df70@syzkaller.appspotmail.com
Tested-by: syzbot+2bf29e42be0666f2df70@syzkaller.appspotmail.com

Tested on:

commit:         a260bd22 media: mc: fix potential use-after-free in me..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=14274d5a580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=42a29b5eebe67b17
dashboard link: https://syzkaller.appspot.com/bug?extid=2bf29e42be0666f2df70
compiler:       Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8

Note: no patches were applied.
Note: testing is done by a robot and is best-effort only.

Forwarded: KASAN: slab-use-after-free Write in media_request_alloc

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org.

***

Subject: KASAN: slab-use-after-free Write in media_request_alloc
Author: mfo@igalia.com

#syz dup: KASAN: slab-use-after-free Write in number