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BUG: KASAN: slab-out-of-bounds in ec168_i2c_xfer+0x4cd/0x640 drivers/media/usb/dvb-usb-v2/ec168.c:143
Read of size 1 at addr ffff8880212d4761 by task syz.5.5104/26701

CPU: 0 UID: 0 PID: 26701 Comm: syz.5.5104 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xba/0x230 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 ec168_i2c_xfer+0x4cd/0x640 drivers/media/usb/dvb-usb-v2/ec168.c:143
 __i2c_transfer+0x79a/0x2020 drivers/i2c/i2c-core-base.c:-1
 i2c_transfer+0x1cc/0x2d0 drivers/i2c/i2c-core-base.c:2317
 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:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fda8f39c799
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:00007fda90334028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fda8f615fa0 RCX: 00007fda8f39c799
RDX: 0000200000000040 RSI: 0000000000000707 RDI: 0000000000000007
RBP: 00007fda8f432c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fda8f616038 R14: 00007fda8f615fa0 R15: 00007fda8f73fa48
 </TASK>

Allocated by task 26701:
 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:5260 [inline]
 __kmalloc_node_track_caller_noprof+0x4db/0x7b0 mm/slub.c:5368
 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:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff8880212d4760
 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 [ffff8880212d4760, ffff8880212d4761)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x212d4
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88813fea5500 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800800080 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 3437754682, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x231/0x280 mm/page_alloc.c:1889
 prep_new_page mm/page_alloc.c:1897 [inline]
 get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3962
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250
 alloc_slab_page mm/slub.c:3292 [inline]
 allocate_slab+0x77/0x660 mm/slub.c:3481
 new_slab mm/slub.c:3539 [inline]
 refill_objects+0x331/0x3c0 mm/slub.c:7175
 refill_sheaf mm/slub.c:2812 [inline]
 __pcs_replace_empty_main+0x2e6/0x730 mm/slub.c:4615
 alloc_from_pcs mm/slub.c:4717 [inline]
 slab_alloc_node mm/slub.c:4851 [inline]
 __do_kmalloc_node mm/slub.c:5259 [inline]
 __kmalloc_noprof+0x474/0x760 mm/slub.c:5272
 kmalloc_noprof include/linux/slab.h:954 [inline]
 kzalloc_noprof include/linux/slab.h:1188 [inline]
 acpi_ns_internalize_name+0x2c9/0x3e0 drivers/acpi/acpica/nsutils.c:331
 acpi_ns_get_node_unlocked+0x186/0x480 drivers/acpi/acpica/nsutils.c:666
 acpi_ns_get_node+0x76/0xc0 drivers/acpi/acpica/nsutils.c:726
 acpi_get_handle+0x192/0x2a0 drivers/acpi/acpica/nsxfname.c:98
 acpi_has_method+0x8c/0xe0 drivers/acpi/utils.c:672
 acpi_dock_match drivers/acpi/scan.c:1264 [inline]
 acpi_set_pnp_ids drivers/acpi/scan.c:1440 [inline]
 acpi_init_device_object+0x25af/0x2ae0 drivers/acpi/scan.c:1819
 acpi_add_single_object+0x106/0x1c20 drivers/acpi/scan.c:1870
 acpi_bus_check_add+0x2b7/0x8a0 drivers/acpi/scan.c:2171
 acpi_ns_walk_namespace+0x2a7/0x770 drivers/acpi/acpica/nswalk.c:-1
page_owner free stack trace missing

Memory state around the buggy address:
 ffff8880212d4600: fa fc fc fc 00 fc fc fc 00 fc fc fc 00 fc fc fc
 ffff8880212d4680: 03 fc fc fc 05 fc fc fc fa fc fc fc 05 fc fc fc
>ffff8880212d4700: fa fc fc fc 06 fc fc fc fa fc fc fc 01 fc fc fc
                                                       ^
 ffff8880212d4780: 07 fc fc fc 00 fc fc fc 05 fc fc fc 06 fc fc fc
 ffff8880212d4800: 05 fc fc fc 05 fc fc fc 03 fc fc fc 05 fc fc fc
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