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BUG: KASAN: slab-use-after-free in dvb_device_open+0xc4/0x350
Read of size 8 at addr ffff88810b6aa618 by task syz.4.163/6565

CPU: 0 UID: 0 PID: 6565 Comm: syz.4.163 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 print_address_description+0x55/0x1e0
 print_report+0x58/0x70
 kasan_report+0x117/0x150
 dvb_device_open+0xc4/0x350
 chrdev_open+0x4cd/0x5e0
 do_dentry_open+0x785/0x14e0
 vfs_open+0x3b/0x340
 path_openat+0x2e08/0x3860
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x113/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe27775cfce
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007fe278614b28 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fe2786156c0 RCX: 00007fe27775cfce
RDX: 0000000000000002 RSI: 00007fe278614c00 RDI: ffffffffffffff9c
RBP: 00007fe278614c00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: cccccccccccccccd
R13: 00007fe277a16038 R14: 00007fe277a15fa0 R15: 00007ffc50fa1f28
 </TASK>

Allocated by task 1:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_cache_noprof+0x31c/0x660
 dvb_register_device+0x2fd/0x21e0
 dvb_register_frontend+0x649/0x950
 vidtv_bridge_probe+0x9aa/0xf80
 platform_probe+0xf9/0x190
 really_probe+0x267/0xaf0
 __driver_probe_device+0x18c/0x320
 driver_probe_device+0x4f/0x240
 __driver_attach+0x349/0x640
 bus_for_each_dev+0x23b/0x2c0
 bus_add_driver+0x345/0x670
 driver_register+0x23a/0x320
 vidtv_bridge_init+0x28/0x50
 do_one_initcall+0x250/0x8d0
 do_initcall_level+0x104/0x190
 do_initcalls+0x59/0xa0
 kernel_init_freeable+0x2a6/0x3e0
 kernel_init+0x1d/0x1d0
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30

Freed by task 6533:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5c/0x80
 kfree+0x1c5/0x640
 dvb_device_open+0x2cd/0x350
 chrdev_open+0x4cd/0x5e0
 do_dentry_open+0x785/0x14e0
 vfs_open+0x3b/0x340
 path_openat+0x2e08/0x3860
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x113/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88810b6aa600
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 24 bytes inside of
 freed 256-byte region [ffff88810b6aa600, ffff88810b6aa700)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10b6aa
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x17ff00000000040(head|node=0|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 017ff00000000040 ffff888100041b40 dead000000000122 0000000000000000
raw: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000
head: 017ff00000000040 ffff888100041b40 dead000000000122 0000000000000000
head: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000
head: 017ff00000000001 ffffffffffffff81 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000002
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 19085745051, free_ts 0
 post_alloc_hook+0x231/0x280
 get_page_from_freelist+0x2418/0x24b0
 __alloc_frozen_pages_noprof+0x233/0x3d0
 allocate_slab+0x77/0x660
 refill_objects+0x331/0x3c0
 __pcs_replace_empty_main+0x2e6/0x730
 __kmalloc_cache_noprof+0x392/0x660
 bus_add_driver+0x162/0x670
 driver_register+0x23a/0x320
 usb_register_driver+0x1e4/0x390
 do_one_initcall+0x250/0x8d0
 do_initcall_level+0x104/0x190
 do_initcalls+0x59/0xa0
 kernel_init_freeable+0x2a6/0x3e0
 kernel_init+0x1d/0x1d0
 ret_from_fork+0x51e/0xb90
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88810b6aa500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88810b6aa580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88810b6aa600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff88810b6aa680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88810b6aa700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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