* [syzbot] [usb?] KASAN: slab-use-after-free Read in gadget_dev_open
@ 2026-07-31 6:03 syzbot
0 siblings, 0 replies; only message in thread
From: syzbot @ 2026-07-31 6:03 UTC (permalink / raw)
To: gregkh, linux-kernel, linux-usb, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: 365f9c7a6b81 Merge branches 'for-next/core' and 'for-next/..
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=113d97b1580000
kernel config: https://syzkaller.appspot.com/x/.config?x=72c97575381cec47
dashboard link: https://syzkaller.appspot.com/bug?extid=1459655b2bf1e798f9d0
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
userspace arch: arm64
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13aa78c6580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=179fb03e580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/eafe0adb7386/disk-365f9c7a.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/29422d607579/vmlinux-365f9c7a.xz
kernel image: https://storage.googleapis.com/syzbot-assets/98ca955a8b54/Image-365f9c7a.gz.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1459655b2bf1e798f9d0@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-use-after-free in __raw_spin_lock_irq include/linux/spinlock_api_smp.h:142 [inline]
BUG: KASAN: slab-use-after-free in _raw_spin_lock_irq+0x58/0x70 kernel/locking/spinlock.c:174
Read of size 1 at addr ffff0000d0323818 by task syz.0.20/4932
CPU: 0 UID: 0 PID: 4932 Comm: syz.0.20 Not tainted syzkaller #0 PREEMPT
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026
Call trace:
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
__dump_stack+0x30/0x40 lib/dump_stack.c:94
dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
print_address_description+0xb0/0x238 mm/kasan/report.c:378
print_report+0x68/0x84 mm/kasan/report.c:482
kasan_report+0x8c/0xc4 mm/kasan/report.c:595
__kasan_check_byte+0x3c/0x54 mm/kasan/common.c:574
kasan_check_byte include/linux/kasan.h:402 [inline]
lock_acquire+0xa4/0x364 kernel/locking/lockdep.c:5842
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock_irq+0x58/0x70 kernel/locking/spinlock.c:174
spin_lock_irq include/linux/spinlock.h:372 [inline]
gadget_dev_open+0x50/0x1c4 drivers/usb/gadget/legacy/inode.c:1919
do_dentry_open+0x5c4/0xfc0 fs/open.c:947
vfs_open+0x44/0x2dc fs/open.c:1052
do_open fs/namei.c:4700 [inline]
path_openat+0x21fc/0x2a60 fs/namei.c:4863
do_file_open+0x1c8/0x2e8 fs/namei.c:4892
do_sys_openat2+0x114/0x1e8 fs/open.c:1368
do_sys_open+0xb0/0xe0 fs/open.c:1374
__do_sys_openat fs/open.c:1390 [inline]
__se_sys_openat fs/open.c:1385 [inline]
__arm64_sys_openat+0xa0/0xbc fs/open.c:1385
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:736
el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594
Allocated by task 4840:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x40/0x78 mm/kasan/common.c:78
kasan_save_alloc_info+0x44/0x54 mm/kasan/generic.c:570
poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
__kasan_kmalloc+0x9c/0xb4 mm/kasan/common.c:415
kasan_kmalloc include/linux/kasan.h:263 [inline]
__kmalloc_cache_noprof+0x2e8/0x5ec mm/slub.c:5515
_kmalloc_noprof include/linux/slab.h:969 [inline]
_kzalloc_noprof include/linux/slab.h:1290 [inline]
dev_new drivers/usb/gadget/legacy/inode.c:176 [inline]
gadgetfs_fill_super+0x19c/0x370 drivers/usb/gadget/legacy/inode.c:2054
vfs_get_super+0xb8/0x148 fs/super.c:1267
get_tree_single+0x30/0x40 fs/super.c:1294
gadgetfs_get_tree+0x28/0x38 drivers/usb/gadget/legacy/inode.c:2085
vfs_get_tree+0x90/0x28c fs/super.c:1694
fc_mount+0x24/0xac fs/namespace.c:1198
do_new_mount_fc fs/namespace.c:3765 [inline]
do_new_mount+0x2a4/0x538 fs/namespace.c:3841
path_mount+0x5f0/0xa88 fs/namespace.c:4161
do_mount+0xe8/0x148 fs/namespace.c:4174
__do_sys_mount fs/namespace.c:4390 [inline]
__se_sys_mount fs/namespace.c:4367 [inline]
__arm64_sys_mount+0x334/0x380 fs/namespace.c:4367
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:736
el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594
Freed by task 4931:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x40/0x78 mm/kasan/common.c:78
kasan_save_free_info+0x58/0x70 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x74/0xa4 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2705 [inline]
slab_free mm/slub.c:6405 [inline]
kfree+0x188/0x690 mm/slub.c:6720
put_dev+0x8c/0xf8 drivers/usb/gadget/legacy/inode.c:169
dev_release+0x100/0x15c drivers/usb/gadget/legacy/inode.c:1215
__fput+0x338/0x74c fs/file_table.c:512
____fput+0x20/0x30 fs/file_table.c:540
task_work_run+0x1cc/0x25c 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:70 [inline]
exit_to_user_mode_loop+0x10c/0x17c kernel/entry/common.c:101
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
arm64_syscall_exit_to_user_mode arch/arm64/kernel/entry-common.c:88 [inline]
el0_svc+0x18c/0x260 arch/arm64/kernel/entry-common.c:737
el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594
The buggy address belongs to the object at ffff0000d0323800
which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 24 bytes inside of
freed 1024-byte region [ffff0000d0323800, ffff0000d0323c00)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x110320
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 05ffc00000000040 ffff0000c0001dc0 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000
head: 05ffc00000000040 ffff0000c0001dc0 dead000000000100 dead000000000122
head: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000
head: 05ffc00000000003 fffffdffc340c801 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff0000d0323700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff0000d0323780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff0000d0323800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff0000d0323880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff0000d0323900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in kernel/locking/qspinlock.h:68:9
index 13411 is out of range for type 'unsigned long[8]'
CPU: 0 UID: 0 PID: 4932 Comm: syz.0.20 Tainted: G B syzkaller #0 PREEMPT
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026
Call trace:
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
__dump_stack+0x30/0x40 lib/dump_stack.c:94
dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
dump_stack+0x1c/0x28 lib/dump_stack.c:129
ubsan_epilogue+0x14/0x48 lib/ubsan.c:233
__ubsan_handle_out_of_bounds+0xd0/0xf8 lib/ubsan.c:455
decode_tail kernel/locking/qspinlock.h:68 [inline]
queued_spin_lock_slowpath+0x834/0xd04 kernel/locking/qspinlock.c:285
queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
do_raw_spin_lock+0x21c/0x2d0 kernel/locking/spinlock_debug.c:116
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:143 [inline]
_raw_spin_lock_irq+0x60/0x70 kernel/locking/spinlock.c:174
spin_lock_irq include/linux/spinlock.h:372 [inline]
gadget_dev_open+0x50/0x1c4 drivers/usb/gadget/legacy/inode.c:1919
do_dentry_open+0x5c4/0xfc0 fs/open.c:947
vfs_open+0x44/0x2dc fs/open.c:1052
do_open fs/namei.c:4700 [inline]
path_openat+0x21fc/0x2a60 fs/namei.c:4863
do_file_open+0x1c8/0x2e8 fs/namei.c:4892
do_sys_openat2+0x114/0x1e8 fs/open.c:1368
do_sys_open+0xb0/0xe0 fs/open.c:1374
__do_sys_openat fs/open.c:1390 [inline]
__se_sys_openat fs/open.c:1385 [inline]
__arm64_sys_openat+0xa0/0xbc fs/open.c:1385
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:736
el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594
---[ end trace ]---
Unable to handle kernel paging request at virtual address ffff7fbfe45e33d2
KASAN: probably wild-memory-access in range [0xfffffdff22f19e90-0xfffffdff22f19e97]
Mem abort info:
ESR = 0x0000000096000006
EC = 0x25: DABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x06: level 2 translation fault
Data abort info:
ISV = 0, ISS = 0x00000006, ISS2 = 0x00000000
CM = 0, WnR = 0, TnD = 0, TagAccess = 0
GCS = 0, Overlay = 0, DirtyBit = 0
swapper pgtable: 4k pages, 48-bit VAs, pgdp=000000021b01e000
[ffff7fbfe45e33d2] pgd=0000000000000000, p4d=100000023cc9f403, pud=100000023cc9e403, pmd=0000000000000000
Internal error: Oops: 0000000096000006 [#1] SMP
Modules linked in:
CPU: 0 UID: 0 PID: 4932 Comm: syz.0.20 Tainted: G B syzkaller #0 PREEMPT
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026
pstate: 834000c5 (Nzcv daIF +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : queued_spin_lock_slowpath+0x52c/0xd04 kernel/locking/qspinlock.c:288
lr : decode_tail kernel/locking/qspinlock.h:68 [inline]
lr : queued_spin_lock_slowpath+0x834/0xd04 kernel/locking/qspinlock.c:285
sp : ffff80009a787560
x29: ffff80009a787600 x28: fffffdff22f19e90 x27: 1fffe000188f6afa
x26: 1fffe0001a064700 x25: ffff0001ade40708 x24: dfff800000000000
x23: ffff7000134f0eb0 x22: ffff0001ade40700 x21: 1fffe00035bc80e0
x20: ffff0000c47b57d0 x19: ffff0000d0323800 x18: 0000000000000000
x17: 363a682e6b636f6c x16: 0000000000000001 x15: 0000000000000000
x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000004
x11: ffff70001145ec6c x10: ffff800088ac7700 x9 : ffff800088ac7710
x8 : 1fffffbfe45e33d2 x7 : 0000000000000001 x6 : ffff80008048de94
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000802f7498
x2 : 0000000000000002 x1 : ffff0000c47b57c0 x0 : 0000000000000000
Call trace:
queued_spin_lock_slowpath+0x52c/0xd04 kernel/locking/qspinlock.c:288 (P)
queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
do_raw_spin_lock+0x21c/0x2d0 kernel/locking/spinlock_debug.c:116
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:143 [inline]
_raw_spin_lock_irq+0x60/0x70 kernel/locking/spinlock.c:174
spin_lock_irq include/linux/spinlock.h:372 [inline]
gadget_dev_open+0x50/0x1c4 drivers/usb/gadget/legacy/inode.c:1919
do_dentry_open+0x5c4/0xfc0 fs/open.c:947
vfs_open+0x44/0x2dc fs/open.c:1052
do_open fs/namei.c:4700 [inline]
path_openat+0x21fc/0x2a60 fs/namei.c:4863
do_file_open+0x1c8/0x2e8 fs/namei.c:4892
do_sys_openat2+0x114/0x1e8 fs/open.c:1368
do_sys_open+0xb0/0xe0 fs/open.c:1374
__do_sys_openat fs/open.c:1390 [inline]
__se_sys_openat fs/open.c:1385 [inline]
__arm64_sys_openat+0xa0/0xbc fs/open.c:1385
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:736
el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594
Code: f94007e9 f9400388 8b09011c d343ff88 (38786908)
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
0: f94007e9 ldr x9, [sp, #8]
4: f9400388 ldr x8, [x28]
8: 8b09011c add x28, x8, x9
c: d343ff88 lsr x8, x28, #3
* 10: 38786908 ldrb w8, [x8, x24] <-- trapping instruction
---
This report is generated by a bot. It may contain errors.
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2026-07-31 6:03 [syzbot] [usb?] KASAN: slab-use-after-free Read in gadget_dev_open syzbot
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