==================================================================
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 ffff8880766d0921 by task syz.3.890/8614

CPU: 1 UID: 0 PID: 8614 Comm: syz.3.890 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
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: 0033:0x7f5e5c39e159
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:00007f5e5d320028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f5e5c625fa0 RCX: 00007f5e5c39e159
RDX: 0000200000000200 RSI: 0000000000000707 RDI: 0000000000000004
RBP: 00007f5e5c435024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5e5c626038 R14: 00007f5e5c625fa0 R15: 00007ffdbd95e3a8
 </TASK>

Allocated by task 8614:
 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 ffff8880766d0920
 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 [ffff8880766d0920, ffff8880766d0921)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880766d0e80 pfn:0x766d0
flags: 0xfff00000000200(workingset|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000200 ffff88801b041500 ffffea0000c37750 ffffea0000d1a710
raw: ffff8880766d0e80 000000000080006f 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 5616, tgid 5616 (syz-executor), ts 108757864886
 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]
 __do_kmalloc_node mm/slub.c:5413 [inline]
 __kmalloc_node_noprof+0x54d/0x720 mm/slub.c:5426
 _kmalloc_node_noprof include/linux/slab.h:1200 [inline]
 __vmalloc_area_node mm/vmalloc.c:3893 [inline]
 __vmalloc_node_range_noprof+0x5b4/0x1540 mm/vmalloc.c:4104
 __vmalloc_node_noprof mm/vmalloc.c:4165 [inline]
 vzalloc_noprof+0xb2/0xe0 mm/vmalloc.c:4243
 alloc_counters+0x63/0x5d0 net/ipv4/netfilter/arp_tables.c:672
 copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:837 [inline]
 get_entries net/ipv6/netfilter/ip6_tables.c:1037 [inline]
 do_ip6t_get_ctl+0xb17/0x12f0 net/ipv6/netfilter/ip6_tables.c:1678
 nf_getsockopt+0x26e/0x290 net/netfilter/nf_sockopt.c:116
 ipv6_getsockopt+0x213/0x2c0 net/ipv6/ipv6_sockglue.c:1464
 do_sock_getsockopt+0x51d/0x7e0 net/socket.c:2503
 __sys_getsockopt net/socket.c:2534 [inline]
 __do_sys_getsockopt net/socket.c:2541 [inline]
 __se_sys_getsockopt net/socket.c:2538 [inline]
 __x64_sys_getsockopt+0x1a4/0x240 net/socket.c:2538
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
page last free pid 5616 tgid 5616 ts 108757839386 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_populate_vmalloc_do mm/kasan/shadow.c:393 [inline]
 __kasan_populate_vmalloc+0x1a8/0x1c0 mm/kasan/shadow.c:424
 kasan_populate_vmalloc include/linux/kasan.h:580 [inline]
 alloc_vmap_area+0xd1a/0x1420 mm/vmalloc.c:2145
 __get_vm_area_node+0x200/0x2f0 mm/vmalloc.c:3248
 __vmalloc_node_range_noprof+0x343/0x1540 mm/vmalloc.c:4064
 __vmalloc_node_noprof mm/vmalloc.c:4165 [inline]
 vzalloc_noprof+0xb2/0xe0 mm/vmalloc.c:4243
 alloc_counters+0x63/0x5d0 net/ipv4/netfilter/arp_tables.c:672
 copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:837 [inline]
 get_entries net/ipv6/netfilter/ip6_tables.c:1037 [inline]
 do_ip6t_get_ctl+0xb17/0x12f0 net/ipv6/netfilter/ip6_tables.c:1678
 nf_getsockopt+0x26e/0x290 net/netfilter/nf_sockopt.c:116
 ipv6_getsockopt+0x213/0x2c0 net/ipv6/ipv6_sockglue.c:1464
 do_sock_getsockopt+0x51d/0x7e0 net/socket.c:2503
 __sys_getsockopt net/socket.c:2534 [inline]
 __do_sys_getsockopt net/socket.c:2541 [inline]
 __se_sys_getsockopt net/socket.c:2538 [inline]
 __x64_sys_getsockopt+0x1a4/0x240 net/socket.c:2538
 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

Memory state around the buggy address:
 ffff8880766d0800: 05 fc fc fc fa fc fc fc 05 fc fc fc fa fc fc fc
 ffff8880766d0880: fa fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc
>ffff8880766d0900: fa fc fc fc 01 fc fc fc 05 fc fc fc fa fc fc fc
                               ^
 ffff8880766d0980: fa fc fc fc 05 fc fc fc fa fc fc fc 00 fc fc fc
 ffff8880766d0a00: fa fc fc fc 00 fc fc fc fa fc fc fc 06 fc fc fc
==================================================================