* [syzbot] [usb?] KASAN: invalid-free in f_uac2_opts_c_srate_store
@ 2026-07-29 5:27 syzbot
0 siblings, 0 replies; 2+ messages in thread
From: syzbot @ 2026-07-29 5:27 UTC (permalink / raw)
To: gregkh, linux-kernel, linux-usb, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: 3dab139d4795 Merge tag 'rust-fixes-7.2-2' of git://git.ker..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10e2b746580000
kernel config: https://syzkaller.appspot.com/x/.config?x=145fa60d73086782
dashboard link: https://syzkaller.appspot.com/bug?extid=a4f65284f1451010b0a8
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1466a449580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12d83fde580000
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-3dab139d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2b5a401a9dc7/vmlinux-3dab139d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/7ed2d255bd44/bzImage-3dab139d.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a4f65284f1451010b0a8@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: invalid-free in f_uac2_opts_c_srate_store+0x1d4/0x260 drivers/usb/gadget/function/f_uac2.c:2091
Free of addr ffff88802a89370c by task syz.0.17/5924
CPU: 0 UID: 0 PID: 5924 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0x13d/0x4b0 mm/kasan/report.c:482
kasan_report_invalid_free+0xb8/0x190 mm/kasan/report.c:557
check_slab_allocation+0xe1/0xf0 mm/kasan/common.c:230
kasan_slab_pre_free include/linux/kasan.h:199 [inline]
slab_free_hook mm/slub.c:2622 [inline]
slab_free mm/slub.c:6377 [inline]
kfree+0x1b6/0x6c0 mm/slub.c:6692
f_uac2_opts_c_srate_store+0x1d4/0x260 drivers/usb/gadget/function/f_uac2.c:2091
flush_write_buffer fs/configfs/file.c:207 [inline]
configfs_write_iter+0x302/0x4e0 fs/configfs/file.c:229
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc39579de99
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc94f16318 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fc395a25fa0 RCX: 00007fc39579de99
RDX: 00000000000000f7 RSI: 0000200000000d40 RDI: 0000000000000003
RBP: 00007fc395833eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc395a25fac R14: 00007fc395a25fa0 R15: 00007fc395a25fa0
</TASK>
Allocated by task 5924:
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415
kasan_kmalloc include/linux/kasan.h:263 [inline]
__do_kmalloc_node mm/slub.c:5334 [inline]
__kmalloc_node_track_caller_noprof+0x331/0x830 mm/slub.c:5471
__kmemdup_nul mm/util.c:64 [inline]
kstrdup+0x51/0xe0 mm/util.c:84
f_uac2_opts_c_srate_store+0x113/0x260 drivers/usb/gadget/function/f_uac2.c:2091
flush_write_buffer fs/configfs/file.c:207 [inline]
configfs_write_iter+0x302/0x4e0 fs/configfs/file.c:229
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88802a893700
which belongs to the cache kmalloc-32 of size 32
The buggy address is located 12 bytes inside of
18-byte region [ffff88802a893700, ffff88802a893712)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2a893
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801bc42780 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800400040 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 0xd2800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1489, tgid 1489 (kworker/u33:2), ts 8170009835, free_ts 0
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859
prep_new_page mm/page_alloc.c:1867 [inline]
get_page_from_freelist+0xf48/0x3530 mm/page_alloc.c:3946
__alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304
alloc_slab_page mm/slub.c:3266 [inline]
allocate_slab mm/slub.c:3380 [inline]
new_slab+0xa2/0x640 mm/slub.c:3426
refill_objects+0xe3/0x410 mm/slub.c:7310
refill_sheaf mm/slub.c:2804 [inline]
__pcs_replace_empty_main+0x376/0x680 mm/slub.c:4675
alloc_from_pcs mm/slub.c:4773 [inline]
slab_alloc_node mm/slub.c:4905 [inline]
__kmalloc_cache_noprof+0x479/0x6c0 mm/slub.c:5485
_kmalloc_noprof include/linux/slab.h:988 [inline]
slab_free_hook mm/slub.c:2629 [inline]
slab_free mm/slub.c:6377 [inline]
kmem_cache_free+0x412/0x6b0 mm/slub.c:6504
__cleanup_sighand kernel/fork.c:1705 [inline]
__cleanup_sighand+0x6a/0xa0 kernel/fork.c:1697
__exit_signal kernel/exit.c:223 [inline]
release_task+0xc31/0x1ab0 kernel/exit.c:270
exit_notify kernel/exit.c:810 [inline]
do_exit+0x13ba/0x2ae0 kernel/exit.c:1021
call_usermodehelper_exec_async+0x35d/0x4b0 kernel/umh.c:122
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
page_owner free stack trace missing
Memory state around the buggy address:
ffff88802a893600: 00 00 00 00 fc fc fc fc fa fb fb fb fc fc fc fc
ffff88802a893680: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
>ffff88802a893700: 00 00 02 fc fc fc fc fc fa fb fb fb fc fc fc fc
^
ffff88802a893780: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
ffff88802a893800: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
==================================================================
---
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2026-07-29 9:52 ` [syzbot] [usb?] KASAN: invalid-free in f_uac2_opts_c_srate_store syzbot
2026-07-29 5:27 syzbot
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