KASAN: slab-out-of-bounds Read in ec168_i2c_xfer

Status: upstream: reported C repro on 2026/03/23 20:13
Subsystems: usb media
Labels: prio:normal
[Documentation on labels]
Reported-by: syzbot+64485d3659c4c07111b4@syzkaller.appspotmail.com
First crash: 191d, last: 8d20h
Cause bisection: failed (error log, bisect log)
  
▶ ▼ ✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision
1cc2c070 assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ KASAN: slab-out-of-bounds Read in ec168_i2c_xfer 2026/05/21 19:25 2026/05/21 19:25 2026/05/21 20:16 d5742584
▶ ▼ Discussions (3)
Title Replies (including bot) Last reply
[PATCH v2] media: ec168: fix slab-out-of-bounds in ec168_i2c_xfer 4 (4) 2026/05/31 01:47
[PATCH] media: ec168: fix slab-out-of-bounds in ec168_i2c_xfer 1 (1) 2026/03/24 00:15
[syzbot] [media?] [usb?] KASAN: slab-out-of-bounds Read in ec168_i2c_xfer 0 (2) 2026/03/23 23:28
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.6 KASAN: slab-out-of-bounds Read in ec168_i2c_xfer 17 syz, C 5 22d 22d 0/2 upstream: reported C repro on 2026/09/06 18:09
linux-5.15 KASAN: slab-out-of-bounds Read in ec168_i2c_xfer 17 syz, C 2 1d04h 22d 0/3 upstream: reported C repro on 2026/09/06 22:26
▶ ▼ Last patch testing requests (11)
Created Duration User Patch Repo Result
2026/08/31 11:43 21m retest repro linux-next report job log log
2026/07/08 06:30 28m retest repro linux-next log
2026/07/08 06:30 37m retest repro linux-next log
2026/06/22 23:24 28m retest repro linux-next log
2026/06/22 23:24 32m retest repro linux-next log
2026/06/22 23:24 40m retest repro linux-next log
2026/06/22 23:24 27m retest repro linux-next log
2026/06/21 10:05 28m retest repro linux-next log
2026/04/26 15:46 33m retest repro linux-next report log
2026/04/26 15:46 27m retest repro linux-next report log
2026/03/23 23:28 37m kartikey406@gmail.com patch linux-next OK log

Sample crash report:
==================================================================
BUG: KASAN: slab-out-of-bounds in ec168_i2c_xfer+0x4d4/0x630 drivers/media/usb/dvb-usb-v2/ec168.c:143
Read of size 1 at addr ffff888034cd6921 by task syz-executor392/5634

CPU: 1 UID: 0 PID: 5634 Comm: syz-executor392 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description+0x55/0x1e0 mm/kasan/report.c:378
 print_report+0x58/0x70 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 ec168_i2c_xfer+0x4d4/0x630 drivers/media/usb/dvb-usb-v2/ec168.c:143
 __i2c_transfer+0x7bf/0x1fe0 drivers/i2c/i2c-core-base.c:-1
 i2c_transfer+0x1cb/0x2d0 drivers/i2c/i2c-core-base.c:2350
 i2cdev_ioctl_rdwr+0x460/0x740 drivers/i2c/i2c-dev.c:306
 i2cdev_ioctl+0x6a5/0x880 drivers/i2c/i2c-dev.c:467
 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:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f088cdf8989
Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 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 d8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff65dafd58 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fff65dafe88 RCX: 00007f088cdf8989
RDX: 0000200000000200 RSI: 0000000000000707 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000000 R09: 00007fff65dafe88
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff65dafe78
R13: 0000000000000002 R14: 00007f088ce88ca0 R15: 0000000000000002
 </TASK>

Allocated by task 5634:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5414 [inline]
 __kmalloc_node_track_caller_noprof+0x4b4/0x720 mm/slub.c:5545
 memdup_user+0x2b/0xd0 mm/util.c:221
 i2cdev_ioctl_rdwr+0x1c6/0x740 drivers/i2c/i2c-dev.c:266
 i2cdev_ioctl+0x6a5/0x880 drivers/i2c/i2c-dev.c:467
 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:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888034cd6920
 which belongs to the cache kmalloc-8 of size 8
The buggy address is located 0 bytes to the right of
 allocated 1-byte region [ffff888034cd6920, ffff888034cd6921)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888034cd6000 pfn:0x34cd6
flags: 0xfff00000000200(workingset|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000200 ffff88801b041500 ffffea0000affa90 ffffea0000d42150
raw: ffff888034cd6000 0000000000800068 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 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 18932087552
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1871
 prep_new_page mm/page_alloc.c:1879 [inline]
 get_page_from_freelist+0x2209/0x2280 mm/page_alloc.c:3943
 __alloc_frozen_pages_noprof+0x217/0x5a0 mm/page_alloc.c:5436
 alloc_slab_page mm/slub.c:3347 [inline]
 allocate_slab+0x7d/0x620 mm/slub.c:3462
 new_slab mm/slub.c:3513 [inline]
 refill_objects+0x2d5/0x350 mm/slub.c:7410
 refill_sheaf mm/slub.c:2885 [inline]
 __pcs_replace_empty_main+0x2c8/0x6c0 mm/slub.c:4774
 alloc_from_pcs mm/slub.c:4850 [inline]
 slab_alloc_node mm/slub.c:4984 [inline]
 __kmalloc_cache_noprof+0x39b/0x600 mm/slub.c:5559
 _kmalloc_noprof include/linux/slab.h:991 [inline]
 _kzalloc_noprof include/linux/slab.h:1312 [inline]
 add_sysfs_param+0x758/0xb80 kernel/params.c:643
 kernel_add_sysfs_param+0x7f/0xe0 kernel/params.c:799
 param_sysfs_builtin+0x199/0x250 kernel/params.c:838
 param_sysfs_builtin_init+0x23/0x30 kernel/params.c:974
 do_one_initcall+0x250/0x870 init/main.c:1357
 do_initcall_level+0x10a/0x1a0 init/main.c:1419
 do_initcalls+0x59/0xa0 init/main.c:1435
 kernel_init_freeable+0x29d/0x3e0 init/main.c:1670
 kernel_init+0x22/0x1d0 init/main.c:1560
page last free pid 189 tgid 189 ts 18839723091 stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 __free_pages_prepare mm/page_alloc.c:1418 [inline]
 __free_frozen_pages+0xc93/0xd90 mm/page_alloc.c:2962
 kasan_depopulate_vmalloc_pte+0x6d/0x90 mm/kasan/shadow.c:484
 apply_to_pte_range mm/memory.c:3470 [inline]
 apply_to_pmd_range mm/memory.c:3514 [inline]
 apply_to_pud_range mm/memory.c:3550 [inline]
 apply_to_p4d_range mm/memory.c:3586 [inline]
 __apply_to_page_range+0xbd8/0x1420 mm/memory.c:3622
 __kasan_release_vmalloc+0xa2/0xd0 mm/kasan/shadow.c:602
 kasan_release_vmalloc include/linux/kasan.h:593 [inline]
 kasan_release_vmalloc_node mm/vmalloc.c:2306 [inline]
 purge_vmap_node+0x220/0x960 mm/vmalloc.c:2328
 __purge_vmap_area_lazy+0x783/0xb40 mm/vmalloc.c:2418
 drain_vmap_area_work+0x27/0x40 mm/vmalloc.c:2452
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Memory state around the buggy address:
 ffff888034cd6800: 00 fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc
 ffff888034cd6880: fa fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc
>ffff888034cd6900: fa fc fc fc 01 fc fc fc 00 fc fc fc fa fc fc fc
                               ^
 ffff888034cd6980: fa fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc
 ffff888034cd6a00: fa fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc
==================================================================

Crashes (30):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/09/05 23:25 upstream 0d9ff90a5422 4f7b22a0 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce KASAN: slab-out-of-bounds Read in ec168_i2c_xfer
2026/09/20 07:24 upstream 50d05c7c76c9 853b104b .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 KASAN: slab-out-of-bounds Read in ec168_i2c_xfer
2026/09/20 02:36 upstream 50d05c7c76c9 853b104b .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 KASAN: slab-out-of-bounds Read in ec168_i2c_xfer
2026/09/19 01:51 upstream 50d05c7c76c9 8d7d05f1 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 KASAN: slab-out-of-bounds Read in ec168_i2c_xfer
2026/03/24 12:03 linux-next 09c0f7f1bcdb baf8bf12 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce KASAN: slab-out-of-bounds Read in ec168_i2c_xfer
2026/03/24 10:26 linux-next 09c0f7f1bcdb baf8bf12 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce KASAN: slab-out-of-bounds Read in ec168_i2c_xfer
2026/03/22 11:14 linux-next 785f0eb2f85d 5b92003d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Read in ec168_i2c_xfer
2026/03/22 09:47 linux-next 785f0eb2f85d 5b92003d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Read in ec168_i2c_xfer
2026/03/22 07:47 linux-next 785f0eb2f85d 5b92003d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Read in ec168_i2c_xfer
2026/03/22 05:59 linux-next 785f0eb2f85d 5b92003d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Read in ec168_i2c_xfer
2026/03/22 04:30 linux-next 785f0eb2f85d 5b92003d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Read in ec168_i2c_xfer
2026/09/06 16:20 upstream 1fc5a74b108f 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: slab-out-of-bounds Read in ec168_i2c_xfer
2026/09/06 16:19 upstream 1fc5a74b108f 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: slab-out-of-bounds Read in ec168_i2c_xfer
2026/09/06 15:05 upstream 1fc5a74b108f 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in ec168_i2c_xfer
2026/09/06 15:05 upstream 1fc5a74b108f 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in ec168_i2c_xfer
2026/09/06 13:54 upstream 1fc5a74b108f 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root KASAN: slab-out-of-bounds Read in ec168_i2c_xfer
2026/09/06 13:53 upstream 1fc5a74b108f 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root KASAN: slab-out-of-bounds Read in ec168_i2c_xfer
2026/09/06 13:53 upstream 1fc5a74b108f 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root KASAN: slab-out-of-bounds Read in ec168_i2c_xfer
2026/09/06 13:26 upstream 1fc5a74b108f 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce KASAN: slab-out-of-bounds Read in ec168_i2c_xfer
2026/09/06 13:25 upstream 1fc5a74b108f 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce KASAN: slab-out-of-bounds Read in ec168_i2c_xfer
2026/09/05 22:28 upstream 0d9ff90a5422 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce KASAN: slab-out-of-bounds Read in ec168_i2c_xfer
2026/09/05 22:28 upstream 0d9ff90a5422 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce KASAN: slab-out-of-bounds Read in ec168_i2c_xfer
2026/03/29 08:46 upstream cbfffcca2bf0 356bdfc9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce KASAN: slab-out-of-bounds Read in ec168_i2c_xfer
2026/09/05 23:48 upstream 0d9ff90a5422 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 KASAN: slab-out-of-bounds Read in ec168_i2c_xfer
2026/09/05 23:48 upstream 0d9ff90a5422 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 KASAN: slab-out-of-bounds Read in ec168_i2c_xfer
2026/09/06 13:33 linux-next 9d80aa4617b3 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce KASAN: slab-out-of-bounds Read in ec168_i2c_xfer
2026/09/06 13:33 linux-next 9d80aa4617b3 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce KASAN: slab-out-of-bounds Read in ec168_i2c_xfer
2026/09/06 13:19 linux-next 9d80aa4617b3 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Read in ec168_i2c_xfer
2026/09/06 13:19 linux-next 9d80aa4617b3 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Read in ec168_i2c_xfer
2026/03/22 03:05 linux-next 785f0eb2f85d 5b92003d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Read in ec168_i2c_xfer
* Struck through repros no longer work on HEAD.