* [syzbot] [media?] [usb?] KASAN: slab-use-after-free Read in dev_dbg_obj
@ 2026-11-01 18:26 syzbot
2026-11-01 20:37 ` Forwarded: [PATCH] media: em28xx: fix v4l2 use-after-free after failed init syzbot
0 siblings, 1 reply; 3+ messages in thread
From: syzbot @ 2026-11-01 18:26 UTC (permalink / raw)
To: laurent.pinchart, linux-kernel, linux-media, linux-usb, mchehab,
sakari.ailus, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: cbbddb6b08cc Merge tag 'power-utilities-2026.10.31' of git..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11fc0581580000
kernel config: https://syzkaller.appspot.com/x/.config?x=bd712e5dbce1d1a0
dashboard link: https://syzkaller.appspot.com/bug?extid=54648a6c1187a7ef46a6
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
userspace arch: i386
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12f0e62d580000
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-cbbddb6b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/4e9212cb9d41/vmlinux-cbbddb6b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b7710a90cc0c/bzImage-cbbddb6b.xz
AI-generated root cause summary:
In drivers/media/usb/em28xx/em28xx-video.c, if em28xx_v4l2_init() fails after
registering video devices (e.g. during v4l2_mc_create_media_graph()) while
userspace concurrently holds an open file handle to a video device node,
unregister_dev drops the initial v4l2_dev reference but leaves dev->v4l2
non-NULL. When the device disconnects, em28xx_v4l2_fini() is called and
incorrectly drops the initial reference a second time via
v4l2_device_put(&v4l2->v4l2_dev). This refcount underflow causes
em28xx_free_v4l2() to free struct em28xx_v4l2 prematurely, resulting in a slab
use-after-free when userspace closes the file descriptor and
v4l2_device_release() accesses embedded media entities.
full analysis: https://syzkaller.appspot.com/x/ai_root_cause?x=54648a6c1187a7ef46a6
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+54648a6c1187a7ef46a6@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-use-after-free in media_type include/media/media-entity.h:443 [inline]
BUG: KASAN: slab-use-after-free in dev_dbg_obj+0x630/0x830 drivers/media/mc/mc-entity.c:96
Read of size 4 at addr ffff888023601bd0 by task v4l_id/6384
CPU: 2 UID: 0 PID: 6384 Comm: v4l_id 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+0xdf/0x1c0 mm/kasan/report.c:595
media_type include/media/media-entity.h:443 [inline]
dev_dbg_obj+0x630/0x830 drivers/media/mc/mc-entity.c:96
media_gobj_destroy drivers/media/mc/mc-entity.c:179 [inline]
media_gobj_destroy+0x4d/0x240 drivers/media/mc/mc-entity.c:173
__media_device_unregister_entity+0x20c/0x2f0 drivers/media/mc/mc-device.c:597
media_device_unregister_entity+0x4b/0x70 drivers/media/mc/mc-device.c:677
v4l2_device_release+0x363/0x480 drivers/media/v4l2-core/v4l2-dev.c:208
device_release+0xd2/0x270 drivers/base/core.c:2640
kobject_cleanup lib/kobject.c:689 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x1f7/0x640 lib/kobject.c:737
put_device+0x1f/0x30 drivers/base/core.c:3886
video_put drivers/media/v4l2-core/v4l2-dev.c:173 [inline]
v4l2_release+0x2da/0x390 drivers/media/v4l2-core/v4l2-dev.c:480
__fput+0x3fb/0xb50 fs/file_table.c:512
fput_close_sync+0x118/0x250 fs/file_table.c:618
filp_close_sync+0x75/0xa0 fs/open.c:1573
__do_sys_close fs/open.c:1596 [inline]
__se_sys_close fs/open.c:1583 [inline]
__x64_sys_close+0x81/0x110 fs/open.c:1583
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x121/0x770 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb504ca7407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffe26ad6260 EFLAGS: 00000202 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 00007fb5053c2880 RCX: 00007fb504ca7407
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007fb5053c26e8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000013
R13: 00007ffe26ad6490 R14: 00007fb505529000 R15: 0000564e446754d8
</TASK>
Allocated by task 34:
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:409 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:426
kasan_kmalloc include/linux/kasan.h:263 [inline]
__kmalloc_cache_noprof+0x2f8/0x6d0 mm/slub.c:5680
_kmalloc_noprof include/linux/slab.h:991 [inline]
_kzalloc_noprof include/linux/slab.h:1312 [inline]
em28xx_v4l2_init.cold+0x94/0x3a7f drivers/media/usb/em28xx/em28xx-video.c:2751
em28xx_init_extension+0x13a/0x200 drivers/media/usb/em28xx/em28xx-core.c:1245
request_module_async+0x1e/0x30 drivers/media/usb/em28xx/em28xx-cards.c:3723
process_one_work+0xac7/0x1b10 kernel/workqueue.c:3495
process_scheduled_works kernel/workqueue.c:3578 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3659
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
The buggy address belongs to the object at ffff888023600000
which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 7120 bytes inside of
freed 8192-byte region [ffff888023600000, ffff888023602000)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x23600
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801d443180 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801d443180 dead000000000100 dead000000000122
head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
head: 00fff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 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 5812, tgid 5812 (syz-executor), ts 73629010596
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1856
prep_new_page mm/page_alloc.c:1864 [inline]
get_page_from_freelist+0x1113/0x35e0 mm/page_alloc.c:3935
__alloc_frozen_pages_noprof+0x2bd/0x3280 mm/page_alloc.c:5444
alloc_slab_page mm/slub.c:3384 [inline]
allocate_slab mm/slub.c:3499 [inline]
new_slab+0xb1/0x6d0 mm/slub.c:3550
refill_objects+0xe3/0x410 mm/slub.c:7539
refill_sheaf mm/slub.c:2917 [inline]
__pcs_replace_empty_main+0x35e/0x650 mm/slub.c:4811
alloc_from_pcs mm/slub.c:4887 [inline]
slab_alloc_node mm/slub.c:5021 [inline]
__do_kmalloc_node mm/slub.c:5530 [inline]
__kmalloc_noprof+0x677/0x840 mm/slub.c:5556
_kmalloc_noprof include/linux/slab.h:995 [inline]
_kzalloc_noprof include/linux/slab.h:1312 [inline]
ops_init+0x77/0x5f0 net/core/net_namespace.c:127
setup_net+0x118/0x3a0 net/core/net_namespace.c:443
copy_net_ns+0x340/0x7a0 net/core/net_namespace.c:584
create_new_namespaces+0x3ea/0xac0 kernel/nsproxy.c:132
unshare_nsproxy_namespaces+0xf6/0x210 kernel/nsproxy.c:234
ksys_unshare+0x44f/0x980 kernel/fork.c:3298
__do_sys_unshare kernel/fork.c:3364 [inline]
__se_sys_unshare kernel/fork.c:3362 [inline]
__ia32_sys_unshare+0x30/0x40 kernel/fork.c:3362
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:79 [inline]
__do_fast_syscall_32+0x14b/0x8c0 arch/x86/entry/syscall_32.c:282
do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:307
page last free pid 5501 tgid 5501 ts 24218447288 stack trace:
reset_page_owner include/linux/page_owner.h:26 [inline]
__free_pages_prepare mm/page_alloc.c:1403 [inline]
__free_frozen_pages+0x7b4/0x1110 mm/page_alloc.c:2954
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x47/0xf0 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x1a0/0x1f0 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:361
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4720 [inline]
slab_alloc_node mm/slub.c:5033 [inline]
kmem_cache_alloc_node_noprof+0x282/0x6e0 mm/slub.c:5105
__alloc_skb+0x140/0x710 net/core/skbuff.c:705
alloc_skb include/linux/skbuff.h:1390 [inline]
alloc_skb_with_frags+0xdb/0x750 net/core/skbuff.c:6898
sock_alloc_send_pskb+0x86a/0x9e0 net/core/sock.c:3093
unix_dgram_sendmsg+0x3f4/0x1a80 net/unix/af_unix.c:2148
unix_seqpacket_sendmsg+0x12a/0x1d0 net/unix/af_unix.c:2549
sock_sendmsg_nosec net/socket.c:800 [inline]
__sock_sendmsg net/socket.c:818 [inline]
sock_write_iter+0x560/0x5d0 net/socket.c:1269
do_iter_readv_writev+0x6f7/0x930 fs/read_write.c:828
vfs_writev+0x360/0xdd0 fs/read_write.c:1058
do_writev+0x28a/0x340 fs/read_write.c:1104
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x121/0x770 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff888023601a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888023601b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888023601b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888023601c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888023601c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
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] 3+ messages in thread
* Forwarded: [PATCH] media: em28xx: fix v4l2 use-after-free after failed init
2026-11-01 18:26 [syzbot] [media?] [usb?] KASAN: slab-use-after-free Read in dev_dbg_obj syzbot
@ 2026-11-01 20:37 ` syzbot
0 siblings, 0 replies; 3+ messages in thread
From: syzbot @ 2026-11-01 20:37 UTC (permalink / raw)
To: linux-kernel
For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org.
***
Subject: [PATCH] media: em28xx: fix v4l2 use-after-free after failed init
Author: drifabdelmalekmohamedsaid@gmail.com
#syz test
---
drivers/media/usb/em28xx/em28xx-video.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/drivers/media/usb/em28xx/em28xx-video.c b/drivers/media/usb/em28xx/em28xx-video.c
index 84424284d486..924a3f7977c9 100644
--- a/drivers/media/usb/em28xx/em28xx-video.c
+++ b/drivers/media/usb/em28xx/em28xx-video.c
@@ -2414,7 +2414,7 @@ static int em28xx_v4l2_open(struct file *filp)
*/
static int em28xx_v4l2_fini(struct em28xx *dev)
{
- struct em28xx_v4l2 *v4l2 = dev->v4l2;
+ struct em28xx_v4l2 *v4l2;
if (dev->is_audio_only) {
/* Shouldn't initialize IR for this interface */
@@ -2426,13 +2426,17 @@ static int em28xx_v4l2_fini(struct em28xx *dev)
return 0;
}
- if (!v4l2)
- return 0;
-
dev_info(&dev->intf->dev, "Closing video extension\n");
mutex_lock(&dev->lock);
+ /* matches em28xx_v4l2_init error paths */
+ v4l2 = dev->v4l2;
+ if (!v4l2){
+ mutex_unlock(&dev->lock);
+ return 0;
+ }
+
v4l2_device_disconnect(&v4l2->v4l2_dev);
em28xx_uninit_usb_xfer(dev, EM28XX_ANALOG_MODE);
@@ -3129,6 +3133,9 @@ static int em28xx_v4l2_init(struct em28xx *dev)
vb2_video_unregister_device(&v4l2->vdev);
}
+ /* matches check in em28xx_v4l2_fini (under the same lock) */
+ dev->v4l2 = NULL;
+
mutex_unlock(&dev->lock);
/*
--
2.43.0
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [syzbot] [media?] [usb?] KASAN: slab-use-after-free Read in dev_dbg_obj
[not found] <20261101203703.165-1-drifabdelmalekmohamedsaid@gmail.com>
@ 2026-11-01 21:08 ` syzbot
0 siblings, 0 replies; 3+ messages in thread
From: syzbot @ 2026-11-01 21:08 UTC (permalink / raw)
To: drifabdelmalekmohamedsaid, linux-kernel, syzkaller-bugs
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
general protection fault in v4l2_open
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000019: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x00000000000000c8-0x00000000000000cf]
CPU: 3 UID: 0 PID: 8236 Comm: v4l_id 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
RIP: 0010:kasan_byte_accessible+0x15/0x30 mm/kasan/generic.c:210
Code: 00 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 48 b8 00 00 00 00 00 fc ff df 48 c1 ef 03 48 01 c7 <0f> b6 07 3c 07 0f 96 c0 e9 8e 5f 68 09 66 66 2e 0f 1f 84 00 00 00
RSP: 0018:ffffc900079d76a0 EFLAGS: 00010082
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8bee97ca RDI: dffffc0000000019
RBP: 00000000000000c8 R08: 0000000000000001 R09: 0000000000000000
R10: ffffffff926ad55f R11: 0000000000000000 R12: ffffffff8bee97ca
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000
FS: 00007f73db395880(0000) GS:ffff888095581000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056143b44d64d CR3: 000000006c150000 CR4: 0000000000352ef0
Call Trace:
<TASK>
__kasan_check_byte+0x13/0x50 mm/kasan/common.c:584
kasan_check_byte include/linux/kasan.h:402 [inline]
lock_acquire kernel/locking/lockdep.c:5916 [inline]
lock_acquire+0x132/0x380 kernel/locking/lockdep.c:5899
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:155 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:181
ida_free+0xd3/0x2f0 lib/idr.c:566
__media_device_unregister_entity+0x70/0x2f0 drivers/media/mc/mc-device.c:582
media_device_unregister_entity+0x4b/0x70 drivers/media/mc/mc-device.c:677
v4l2_device_release+0x363/0x480 drivers/media/v4l2-core/v4l2-dev.c:208
device_release+0xd2/0x270 drivers/base/core.c:2640
kobject_cleanup lib/kobject.c:689 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x1f7/0x640 lib/kobject.c:737
put_device+0x1f/0x30 drivers/base/core.c:3886
video_put drivers/media/v4l2-core/v4l2-dev.c:173 [inline]
v4l2_open+0x2e5/0x490 drivers/media/v4l2-core/v4l2-dev.c:450
chrdev_open+0x234/0x6a0 fs/char_dev.c:413
do_dentry_open+0x674/0x1470 fs/open.c:1000
vfs_open_consume+0xcc/0x460 fs/open.c:1131
do_open fs/namei.c:4851 [inline]
path_openat+0x1547/0x23f0 fs/namei.c:5016
do_file_open+0x20e/0x430 fs/namei.c:5045
do_sys_openat2+0x163/0x1d0 fs/open.c:1442
do_sys_open fs/open.c:1448 [inline]
__do_sys_openat fs/open.c:1464 [inline]
__se_sys_openat fs/open.c:1459 [inline]
__x64_sys_openat+0x12d/0x210 fs/open.c:1459
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x121/0x770 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f73daca7407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007fff8d33df10 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f73db395880 RCX: 00007f73daca7407
RDX: 0000000000000000 RSI: 00007fff8d33ef1d RDI: ffffffffffffff9c
RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 00007fff8d33e160 R14: 00007f73db4fc000 R15: 000056143b4514d8
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:kasan_byte_accessible+0x15/0x30 mm/kasan/generic.c:210
Code: 00 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 48 b8 00 00 00 00 00 fc ff df 48 c1 ef 03 48 01 c7 <0f> b6 07 3c 07 0f 96 c0 e9 8e 5f 68 09 66 66 2e 0f 1f 84 00 00 00
RSP: 0018:ffffc900079d76a0 EFLAGS: 00010082
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8bee97ca RDI: dffffc0000000019
RBP: 00000000000000c8 R08: 0000000000000001 R09: 0000000000000000
R10: ffffffff926ad55f R11: 0000000000000000 R12: ffffffff8bee97ca
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000
FS: 00007f73db395880(0000) GS:ffff888095581000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056143b44d64d CR3: 000000006c150000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
0: 00 00 add %al,(%rax)
2: 0f 1f 00 nopl (%rax)
5: 90 nop
6: 90 nop
7: 90 nop
8: 90 nop
9: 90 nop
a: 90 nop
b: 90 nop
c: 90 nop
d: 90 nop
e: 90 nop
f: 90 nop
10: 90 nop
11: 90 nop
12: 90 nop
13: 90 nop
14: 90 nop
15: 0f 1f 40 d6 nopl -0x2a(%rax)
19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
20: fc ff df
23: 48 c1 ef 03 shr $0x3,%rdi
27: 48 01 c7 add %rax,%rdi
* 2a: 0f b6 07 movzbl (%rdi),%eax <-- trapping instruction
2d: 3c 07 cmp $0x7,%al
2f: 0f 96 c0 setbe %al
32: e9 8e 5f 68 09 jmp 0x9685fc5
37: 66 data16
38: 66 data16
39: 2e cs
3a: 0f .byte 0xf
3b: 1f (bad)
3c: 84 00 test %al,(%rax)
Tested on:
commit: 46fec1c3 Merge tag 'sched-urgent-2026-11-01' of git://..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=152fb935580000
kernel config: https://syzkaller.appspot.com/x/.config?x=f4b0888d27d9a541
dashboard link: https://syzkaller.appspot.com/bug?extid=54648a6c1187a7ef46a6
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
userspace arch: i386
patch: https://syzkaller.appspot.com/x/patch.diff?x=1222acb1580000
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2026-11-01 18:26 [syzbot] [media?] [usb?] KASAN: slab-use-after-free Read in dev_dbg_obj syzbot
2026-11-01 20:37 ` Forwarded: [PATCH] media: em28xx: fix v4l2 use-after-free after failed init syzbot
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2026-11-01 21:08 ` [syzbot] [media?] [usb?] KASAN: slab-use-after-free Read in dev_dbg_obj syzbot
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