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* [syzbot] [bluetooth?] [usb?] KASAN: slab-use-after-free Read in btusb_disconnect
@ 2025-07-04  8:16 syzbot
  2025-07-04 14:03 ` Hillf Danton
  2025-11-05 16:05 ` Forwarded: potential fix syzbot
  0 siblings, 2 replies; 6+ messages in thread
From: syzbot @ 2025-07-04  8:16 UTC (permalink / raw)
  To: linux-bluetooth, linux-kernel, linux-usb, luiz.dentz, marcel,
	syzkaller-bugs

Hello,

syzbot found the following issue on:

HEAD commit:    cf16f408364e usb: core: config: Prevent OOB read in SS end..
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
console output: https://syzkaller.appspot.com/x/log.txt?x=1356f48c580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=a4c5153915e19e58
dashboard link: https://syzkaller.appspot.com/bug?extid=2fc81b50a4f8263a159b
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12cf7770580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1756f48c580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/a4e5962e656a/disk-cf16f408.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/13d6d9e53c15/vmlinux-cf16f408.xz
kernel image: https://storage.googleapis.com/syzbot-assets/dea34e20aa1d/bzImage-cf16f408.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2fc81b50a4f8263a159b@syzkaller.appspotmail.com

usb 4-1: New USB device found, idVendor=0e8d, idProduct=763f, bcdDevice=9b.23
usb 4-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 4-1: Product: syz
usb 4-1: Manufacturer: syz
usb 4-1: SerialNumber: syz
usb 4-1: USB disconnect, device number 2
==================================================================
BUG: KASAN: slab-use-after-free in btusb_disconnect+0x4dc/0x580 drivers/bluetooth/btusb.c:4287
Read of size 4 at addr ffff888107ebf7c0 by task kworker/0:1/10

CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Not tainted 6.16.0-rc2-syzkaller-00053-gcf16f408364e #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: usb_hub_wq hub_event
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:408 [inline]
 print_report+0xcd/0x680 mm/kasan/report.c:521
 kasan_report+0xe0/0x110 mm/kasan/report.c:634
 btusb_disconnect+0x4dc/0x580 drivers/bluetooth/btusb.c:4287
 usb_unbind_interface+0x1da/0x9a0 drivers/usb/core/driver.c:458
 device_remove drivers/base/dd.c:569 [inline]
 device_remove+0x122/0x170 drivers/base/dd.c:561
 __device_release_driver drivers/base/dd.c:1272 [inline]
 device_release_driver_internal+0x44b/0x620 drivers/base/dd.c:1295
 bus_remove_device+0x22f/0x420 drivers/base/bus.c:579
 device_del+0x396/0x9f0 drivers/base/core.c:3881
 usb_disable_device+0x355/0x7d0 drivers/usb/core/message.c:1418
 usb_disconnect+0x2e1/0x920 drivers/usb/core/hub.c:2316
 hub_port_connect drivers/usb/core/hub.c:5375 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5675 [inline]
 port_event drivers/usb/core/hub.c:5835 [inline]
 hub_event+0x1aa0/0x5030 drivers/usb/core/hub.c:5917
 process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3321 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
 kthread+0x3c5/0x780 kernel/kthread.c:464
 ret_from_fork+0x5b3/0x6c0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Allocated by task 10:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:394
 kasan_kmalloc include/linux/kasan.h:260 [inline]
 __do_kmalloc_node mm/slub.c:4328 [inline]
 __kmalloc_node_track_caller_noprof+0x212/0x4c0 mm/slub.c:4347
 alloc_dr drivers/base/devres.c:119 [inline]
 devm_kmalloc+0xa5/0x260 drivers/base/devres.c:864
 devm_kzalloc include/linux/device/devres.h:53 [inline]
 btusb_probe+0x23f/0x4480 drivers/bluetooth/btusb.c:3892
 usb_probe_interface+0x300/0x9c0 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:579 [inline]
 really_probe+0x241/0xa90 drivers/base/dd.c:657
 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:799
 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:829
 __device_attach_driver+0x1df/0x310 drivers/base/dd.c:957
 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:462
 __device_attach+0x1e4/0x4b0 drivers/base/dd.c:1029
 bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537
 device_add+0x1148/0x1a70 drivers/base/core.c:3692
 usb_set_configuration+0x1187/0x1e20 drivers/usb/core/message.c:2210
 usb_generic_driver_probe+0xb1/0x110 drivers/usb/core/generic.c:250
 usb_probe_device+0xec/0x3e0 drivers/usb/core/driver.c:291
 call_driver_probe drivers/base/dd.c:579 [inline]
 really_probe+0x241/0xa90 drivers/base/dd.c:657
 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:799
 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:829
 __device_attach_driver+0x1df/0x310 drivers/base/dd.c:957
 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:462
 __device_attach+0x1e4/0x4b0 drivers/base/dd.c:1029
 bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537
 device_add+0x1148/0x1a70 drivers/base/core.c:3692
 usb_new_device+0xd07/0x1a20 drivers/usb/core/hub.c:2663
 hub_port_connect drivers/usb/core/hub.c:5535 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5675 [inline]
 port_event drivers/usb/core/hub.c:5835 [inline]
 hub_event+0x2f85/0x5030 drivers/usb/core/hub.c:5917
 process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3321 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
 kthread+0x3c5/0x780 kernel/kthread.c:464
 ret_from_fork+0x5b3/0x6c0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Freed by task 10:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
 poison_slab_object mm/kasan/common.c:247 [inline]
 __kasan_slab_free+0x37/0x50 mm/kasan/common.c:264
 kasan_slab_free include/linux/kasan.h:233 [inline]
 slab_free_hook mm/slub.c:2381 [inline]
 slab_free mm/slub.c:4643 [inline]
 kfree+0x283/0x470 mm/slub.c:4842
 release_nodes+0x11e/0x240 drivers/base/devres.c:506
 devres_release_all+0x112/0x180 drivers/base/devres.c:535
 device_unbind_cleanup+0x19/0x1b0 drivers/base/dd.c:549
 __device_release_driver drivers/base/dd.c:1277 [inline]
 device_release_driver_internal+0x4c3/0x620 drivers/base/dd.c:1295
 usb_driver_release_interface+0x109/0x190 drivers/usb/core/driver.c:640
 btusb_disconnect+0x448/0x580 drivers/bluetooth/btusb.c:4280
 usb_unbind_interface+0x1da/0x9a0 drivers/usb/core/driver.c:458
 device_remove drivers/base/dd.c:569 [inline]
 device_remove+0x122/0x170 drivers/base/dd.c:561
 __device_release_driver drivers/base/dd.c:1272 [inline]
 device_release_driver_internal+0x44b/0x620 drivers/base/dd.c:1295
 bus_remove_device+0x22f/0x420 drivers/base/bus.c:579
 device_del+0x396/0x9f0 drivers/base/core.c:3881
 usb_disable_device+0x355/0x7d0 drivers/usb/core/message.c:1418
 usb_disconnect+0x2e1/0x920 drivers/usb/core/hub.c:2316
 hub_port_connect drivers/usb/core/hub.c:5375 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5675 [inline]
 port_event drivers/usb/core/hub.c:5835 [inline]
 hub_event+0x1aa0/0x5030 drivers/usb/core/hub.c:5917
 process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3321 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
 kthread+0x3c5/0x780 kernel/kthread.c:464
 ret_from_fork+0x5b3/0x6c0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

The buggy address belongs to the object at ffff888107ebf000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1984 bytes inside of
 freed 2048-byte region [ffff888107ebf000, ffff888107ebf800)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x107eb8
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x200000000000040(head|node=0|zone=2)
page_type: f5(slab)
raw: 0200000000000040 ffff888100042000 ffffea00041ba600 dead000000000002
raw: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000
head: 0200000000000040 ffff888100042000 ffffea00041ba600 dead000000000002
head: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000
head: 0200000000000003 ffffea00041fae01 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 3804462285, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1704
 prep_new_page mm/page_alloc.c:1712 [inline]
 get_page_from_freelist+0xf98/0x2ce0 mm/page_alloc.c:3669
 __alloc_frozen_pages_noprof+0x259/0x21e0 mm/page_alloc.c:4959
 alloc_pages_mpol+0xe4/0x410 mm/mempolicy.c:2419
 alloc_slab_page mm/slub.c:2451 [inline]
 allocate_slab mm/slub.c:2619 [inline]
 new_slab+0x23b/0x330 mm/slub.c:2673
 ___slab_alloc+0xda5/0x1940 mm/slub.c:3859
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3949
 __slab_alloc_node mm/slub.c:4024 [inline]
 slab_alloc_node mm/slub.c:4185 [inline]
 __kmalloc_cache_noprof+0x209/0x3c0 mm/slub.c:4354
 kmalloc_noprof include/linux/slab.h:905 [inline]
 kmalloc_array_noprof include/linux/slab.h:948 [inline]
 netdev_create_hash+0x3c/0xc0 net/core/dev.c:12447
 netdev_init+0x70/0x230 net/core/dev.c:12463
 ops_init+0x1df/0x5f0 net/core/net_namespace.c:138
 __register_pernet_operations net/core/net_namespace.c:1284 [inline]
 register_pernet_operations+0x39c/0x700 net/core/net_namespace.c:1361
 register_pernet_subsys+0x28/0x40 net/core/net_namespace.c:1402
 net_dev_init+0x13a/0xcb0 net/core/dev.c:12796
 do_one_initcall+0x120/0x6e0 init/main.c:1274
 do_initcall_level init/main.c:1336 [inline]
 do_initcalls init/main.c:1352 [inline]
 do_basic_setup init/main.c:1371 [inline]
 kernel_init_freeable+0x5c2/0x900 init/main.c:1584
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888107ebf680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888107ebf700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888107ebf780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff888107ebf800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888107ebf880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

^ permalink raw reply	[flat|nested] 6+ messages in thread
* [syzbot] [ext4?] KASAN: slab-out-of-bounds Read in ext4_search_dir
@ 2025-10-02  0:10 syzbot
  2025-11-08  5:34 ` Forwarded: potential fix syzbot
  0 siblings, 1 reply; 6+ messages in thread
From: syzbot @ 2025-10-02  0:10 UTC (permalink / raw)
  To: adilger.kernel, linux-ext4, linux-kernel, syzkaller-bugs, tytso

Hello,

syzbot found the following issue on:

HEAD commit:    50c19e20ed2e Merge tag 'nolibc-20250928-for-6.18-1' of git..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15bd8092580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ee1d7eda39c03d2c
dashboard link: https://syzkaller.appspot.com/bug?extid=3ee481e21fd75e14c397
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=14f30a7c580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1109e942580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-50c19e20.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/33a22a854fe0/vmlinux-50c19e20.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e68f79994eb8/bzImage-50c19e20.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/921fccc3cfcf/mount_0.gz
  fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=16c42092580000)

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3ee481e21fd75e14c397@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: use-after-free in ext4_search_dir+0xf1/0x1b0 fs/ext4/namei.c:1469
Read of size 1 at addr ffff8880528ccb57 by task syz.0.24/5691

CPU: 0 UID: 0 PID: 5691 Comm: syz.0.24 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+0x189/0x250 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
 ext4_search_dir+0xf1/0x1b0 fs/ext4/namei.c:1469
 ext4_find_inline_entry+0x492/0x5f0 fs/ext4/inline.c:1621
 __ext4_find_entry+0x2fd/0x1f20 fs/ext4/namei.c:1542
 ext4_lookup_entry fs/ext4/namei.c:1703 [inline]
 ext4_lookup+0x13d/0x6c0 fs/ext4/namei.c:1771
 lookup_open fs/namei.c:3774 [inline]
 open_last_lookups fs/namei.c:3895 [inline]
 path_openat+0x1101/0x3830 fs/namei.c:4131
 do_filp_open+0x1fa/0x410 fs/namei.c:4161
 do_sys_openat2+0x121/0x1c0 fs/open.c:1435
 do_sys_open fs/open.c:1450 [inline]
 __do_sys_openat fs/open.c:1466 [inline]
 __se_sys_openat fs/open.c:1461 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1461
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f807b98eec9
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:00007f807c806038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f807bbe6090 RCX: 00007f807b98eec9
RDX: 0000000000000042 RSI: 0000200000000040 RDI: ffffffffffffff9c
RBP: 00007f807ba11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f807bbe6128 R14: 00007f807bbe6090 R15: 00007ffea28141a8
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x7fe26f59e pfn:0x528cc
flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff)
raw: 04fff00000000000 ffffea00014a3348 ffffea00014a3208 0000000000000000
raw: 00000007fe26f59e 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO|__GFP_COMP), pid 5688, tgid 5688 (rm), ts 112106822009, free_ts 112155145845
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851
 prep_new_page mm/page_alloc.c:1859 [inline]
 get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
 folio_alloc_mpol_noprof mm/mempolicy.c:2435 [inline]
 vma_alloc_folio_noprof+0xe4/0x200 mm/mempolicy.c:2470
 folio_prealloc+0x30/0x180 mm/memory.c:-1
 alloc_anon_folio mm/memory.c:4997 [inline]
 do_anonymous_page mm/memory.c:5054 [inline]
 do_pte_missing mm/memory.c:4232 [inline]
 handle_pte_fault mm/memory.c:6052 [inline]
 __handle_mm_fault+0x2ab9/0x5440 mm/memory.c:6195
 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6364
 do_user_addr_fault+0xa7c/0x1380 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
page last free pid 5688 tgid 5688 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 free_unref_folios+0xdbd/0x1520 mm/page_alloc.c:2952
 folios_put_refs+0x559/0x640 mm/swap.c:999
 free_pages_and_swap_cache+0x277/0x520 mm/swap_state.c:264
 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline]
 tlb_batch_pages_flush mm/mmu_gather.c:149 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:397 [inline]
 tlb_flush_mmu+0x3a0/0x680 mm/mmu_gather.c:404
 tlb_finish_mmu+0xc3/0x1d0 mm/mmu_gather.c:497
 exit_mmap+0x44c/0xb50 mm/mmap.c:1293
 __mmput+0x118/0x430 kernel/fork.c:1130
 exit_mm+0x1da/0x2c0 kernel/exit.c:582
 do_exit+0x648/0x2300 kernel/exit.c:949
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1102
 __do_sys_exit_group kernel/exit.c:1113 [inline]
 __se_sys_exit_group kernel/exit.c:1111 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1111
 x64_sys_call+0x21f7/0x2200 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff8880528cca00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8880528cca80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8880528ccb00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                 ^
 ffff8880528ccb80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8880528ccc00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================


---
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^ permalink raw reply	[flat|nested] 6+ messages in thread
* [syzbot] [ntfs3?] KMSAN: uninit-value in ntfs_read_bh
@ 2024-09-01 20:28 syzbot
  2025-09-25 16:59 ` Forwarded: potential fix syzbot
  0 siblings, 1 reply; 6+ messages in thread
From: syzbot @ 2024-09-01 20:28 UTC (permalink / raw)
  To: almaz.alexandrovich, linux-kernel, ntfs3, syzkaller-bugs

Hello,

syzbot found the following issue on:

HEAD commit:    431c1646e1f8 Linux 6.11-rc6
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=137426eb980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=35c699864e165c51
dashboard link: https://syzkaller.appspot.com/bug?extid=7a2ba6b7b66340cff225
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/5ab3219cb5e8/disk-431c1646.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/82e6779c1851/vmlinux-431c1646.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d5d4a104ce36/bzImage-431c1646.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7a2ba6b7b66340cff225@syzkaller.appspotmail.com

=====================================================
BUG: KMSAN: uninit-value in ntfs_fix_post_read fs/ntfs3/fsntfs.c:180 [inline]
BUG: KMSAN: uninit-value in ntfs_read_bh+0x1eb/0xde0 fs/ntfs3/fsntfs.c:1317
 ntfs_fix_post_read fs/ntfs3/fsntfs.c:180 [inline]
 ntfs_read_bh+0x1eb/0xde0 fs/ntfs3/fsntfs.c:1317
 indx_read+0x44e/0x17b0 fs/ntfs3/index.c:1067
 indx_find+0xd12/0x1440 fs/ntfs3/index.c:1181
 indx_update_dup+0x607/0xf80 fs/ntfs3/index.c:2666
 ni_update_parent+0x12de/0x14b0 fs/ntfs3/frecord.c:3301
 ni_write_inode+0x1cf4/0x1de0 fs/ntfs3/frecord.c:3392
 ntfs3_write_inode+0x94/0xb0 fs/ntfs3/inode.c:1052
 write_inode fs/fs-writeback.c:1497 [inline]
 __writeback_single_inode+0x849/0x12c0 fs/fs-writeback.c:1716
 writeback_sb_inodes+0xc95/0x1e00 fs/fs-writeback.c:1947
 wb_writeback+0x4df/0xea0 fs/fs-writeback.c:2127
 wb_do_writeback fs/fs-writeback.c:2274 [inline]
 wb_workfn+0x40b/0x1940 fs/fs-writeback.c:2314
 process_one_work kernel/workqueue.c:3231 [inline]
 process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3312
 worker_thread+0xea7/0x14d0 kernel/workqueue.c:3389
 kthread+0x3e2/0x540 kernel/kthread.c:389
 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Uninit was stored to memory at:
 ntfs_read_run_nb+0x786/0x1070 fs/ntfs3/fsntfs.c:1252
 ntfs_read_bh+0x64/0xde0 fs/ntfs3/fsntfs.c:1313
 indx_read+0x44e/0x17b0 fs/ntfs3/index.c:1067
 indx_find+0xd12/0x1440 fs/ntfs3/index.c:1181
 indx_update_dup+0x607/0xf80 fs/ntfs3/index.c:2666
 ni_update_parent+0x12de/0x14b0 fs/ntfs3/frecord.c:3301
 ni_write_inode+0x1cf4/0x1de0 fs/ntfs3/frecord.c:3392
 ntfs3_write_inode+0x94/0xb0 fs/ntfs3/inode.c:1052
 write_inode fs/fs-writeback.c:1497 [inline]
 __writeback_single_inode+0x849/0x12c0 fs/fs-writeback.c:1716
 writeback_sb_inodes+0xc95/0x1e00 fs/fs-writeback.c:1947
 wb_writeback+0x4df/0xea0 fs/fs-writeback.c:2127
 wb_do_writeback fs/fs-writeback.c:2274 [inline]
 wb_workfn+0x40b/0x1940 fs/fs-writeback.c:2314
 process_one_work kernel/workqueue.c:3231 [inline]
 process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3312
 worker_thread+0xea7/0x14d0 kernel/workqueue.c:3389
 kthread+0x3e2/0x540 kernel/kthread.c:389
 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Uninit was created at:
 __alloc_pages_noprof+0x9d6/0xe70 mm/page_alloc.c:4718
 alloc_pages_mpol_noprof+0x299/0x990 mm/mempolicy.c:2263
 alloc_pages_noprof mm/mempolicy.c:2343 [inline]
 folio_alloc_noprof+0x1db/0x310 mm/mempolicy.c:2350
 filemap_alloc_folio_noprof+0xa6/0x440 mm/filemap.c:1008
 __filemap_get_folio+0xa05/0x14b0 mm/filemap.c:1950
 grow_dev_folio fs/buffer.c:1047 [inline]
 grow_buffers fs/buffer.c:1113 [inline]
 __getblk_slow fs/buffer.c:1139 [inline]
 bdev_getblk+0x2c9/0xab0 fs/buffer.c:1441
 __getblk include/linux/buffer_head.h:381 [inline]
 sb_getblk include/linux/buffer_head.h:387 [inline]
 ntfs_get_bh+0x605/0x1190 fs/ntfs3/fsntfs.c:1365
 indx_new+0x1bc/0x780 fs/ntfs3/index.c:955
 indx_insert_into_root+0x2fd1/0x37d0 fs/ntfs3/index.c:1723
 indx_insert_entry+0xe1d/0xee0 fs/ntfs3/index.c:1982
 ntfs_create_inode+0x4391/0x4df0 fs/ntfs3/inode.c:1689
 ntfs_mkdir+0x56/0x70 fs/ntfs3/namei.c:207
 vfs_mkdir+0x4a0/0x780 fs/namei.c:4210
 do_mkdirat+0x529/0x810 fs/namei.c:4233
 __do_sys_mkdirat fs/namei.c:4248 [inline]
 __se_sys_mkdirat fs/namei.c:4246 [inline]
 __x64_sys_mkdirat+0xc6/0x120 fs/namei.c:4246
 x64_sys_call+0x3a81/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:259
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 1 UID: 0 PID: 2918 Comm: kworker/u8:9 Not tainted 6.11.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Workqueue: writeback wb_workfn (flush-7:4)
=====================================================


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

^ permalink raw reply	[flat|nested] 6+ messages in thread
end of thread, other threads:[~2025-11-08  5:34 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2025-07-04  8:16 [syzbot] [bluetooth?] [usb?] KASAN: slab-use-after-free Read in btusb_disconnect syzbot
2025-07-04 14:03 ` Hillf Danton
2025-07-04 16:12   ` syzbot
2025-11-05 16:05 ` Forwarded: potential fix syzbot
  -- strict thread matches above, loose matches on Subject: below --
2025-10-02  0:10 [syzbot] [ext4?] KASAN: slab-out-of-bounds Read in ext4_search_dir syzbot
2025-11-08  5:34 ` Forwarded: potential fix syzbot
2024-09-01 20:28 [syzbot] [ntfs3?] KMSAN: uninit-value in ntfs_read_bh syzbot
2025-09-25 16:59 ` Forwarded: potential fix syzbot

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