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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 ffff88802af9f981 by task syz.0.17/6329

CPU: 0 UID: 0 PID: 6329 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
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: 0033:0x7fb8c879e159
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:00007fb8c96b2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fb8c8a25fa0 RCX: 00007fb8c879e159
RDX: 0000200000000200 RSI: 0000000000000707 RDI: 0000000000000004
RBP: 00007fb8c8835024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb8c8a26038 R14: 00007fb8c8a25fa0 R15: 00007fff733b6b98
 </TASK>

Allocated by task 6329:
 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:409 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:426
 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 ffff88802af9f980
 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 [ffff88802af9f980, ffff88802af9f981)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2af9f
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801b041500 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000800080 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 103, tgid 103 (kworker/u8:5), ts 11006605603
 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:7418
 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_array_node_noprof include/linux/slab.h:1297 [inline]
 __blk_mq_realloc_hw_ctxs+0xe6/0x660 block/blk-mq.c:4559
 blk_mq_realloc_hw_ctxs block/blk-mq.c:4623 [inline]
 blk_mq_init_allocated_queue+0x357/0x13c0 block/blk-mq.c:4653
 blk_mq_alloc_queue+0x1ba/0x2e0 block/blk-mq.c:4435
 scsi_alloc_sdev+0x79d/0xc60 drivers/scsi/scsi_scan.c:339
 scsi_probe_and_add_lun+0x156/0x47b0 drivers/scsi/scsi_scan.c:1228
 __scsi_scan_target+0x199/0xd10 drivers/scsi/scsi_scan.c:1805
 scsi_scan_channel drivers/scsi/scsi_scan.c:1895 [inline]
 scsi_scan_host_selected+0x391/0x6c0 drivers/scsi/scsi_scan.c:1924
 do_scsi_scan_host drivers/scsi/scsi_scan.c:2057 [inline]
 do_scan_async+0x10e/0x660 drivers/scsi/scsi_scan.c:2067
 async_run_entry_fn+0x9d/0x430 kernel/async.c:129
page last free pid 1162 tgid 1162 ts 10996494426 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+0xc2/0x100 mm/vmalloc.c:4165
 alloc_thread_stack_node kernel/fork.c:359 [inline]
 dup_task_struct+0x2c6/0xa00 kernel/fork.c:930
 copy_process+0x7e0/0x4400 kernel/fork.c:2134
 kernel_clone+0x2d7/0x940 kernel/fork.c:2771
 user_mode_thread+0x115/0x180 kernel/fork.c:2848
 call_usermodehelper_exec_work+0x5c/0x230 kernel/umh.c:169
 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:
 ffff88802af9f880: 00 fc fc fc 00 fc fc fc 00 fc fc fc fa fc fc fc
 ffff88802af9f900: 06 fc fc fc fa fc fc fc 06 fc fc fc 06 fc fc fc
>ffff88802af9f980: 01 fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc
                   ^
 ffff88802af9fa00: fa fc fc fc fa fc fc fc 00 fc fc fc 00 fc fc fc
 ffff88802af9fa80: 06 fc fc fc 07 fc fc fc 00 fc fc fc 00 fc fc fc
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