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BUG: KASAN: slab-use-after-free in dvb_media_device_free+0x3a/0x510
Read of size 8 at addr ffff88816e5eb4b0 by task syz.0.5813/1532

CPU: 0 UID: 0 PID: 1532 Comm: syz.0.5813 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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_media_device_free+0x3a/0x510
 dvb_remove_device+0x107/0x280
 dvb_unregister_frontend+0x79/0x130
 vidtv_bridge_remove+0x92/0x120
 device_release_driver_internal+0x48b/0x880
 unbind_store+0x1a1/0x1d0
 kernfs_fop_write_iter+0x3a4/0x540
 vfs_write+0x612/0xba0
 ksys_write+0x150/0x270
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7eff1c59e0d9
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:00007eff1d428028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007eff1c825fa0 RCX: 00007eff1c59e0d9
RDX: 0000000000000007 RSI: 0000200000000300 RDI: 0000000000000005
RBP: 00007eff1c635024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007eff1c826038 R14: 00007eff1c825fa0 R15: 00007fff398893a8
 </TASK>

Allocated by task 1:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_cache_noprof+0x32d/0x660
 dvb_register_device+0x309/0x1dd0
 dvb_register_frontend+0x603/0x900
 vidtv_bridge_probe+0x9d5/0xf60
 platform_probe+0xf9/0x190
 really_probe+0x254/0xae0
 __driver_probe_device+0x1e8/0x360
 driver_probe_device+0x4f/0x240
 __driver_attach+0x339/0x600
 bus_for_each_dev+0x23b/0x2c0
 bus_add_driver+0x345/0x670
 driver_register+0x23a/0x320
 vidtv_bridge_init+0x3d/0x60
 do_one_initcall+0x250/0x870
 do_initcall_level+0x10a/0x1a0
 do_initcalls+0x59/0xa0
 kernel_init_freeable+0x29d/0x3e0
 kernel_init+0x1d/0x1d0
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30

Freed by task 1532:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x40/0x50
 __kasan_slab_free+0x5c/0x80
 kfree+0x1c5/0x640
 dvb_remove_device+0xce/0x280
 dvb_unregister_frontend+0x79/0x130
 vidtv_bridge_remove+0x92/0x120
 device_release_driver_internal+0x48b/0x880
 unbind_store+0x1a1/0x1d0
 kernfs_fop_write_iter+0x3a4/0x540
 vfs_write+0x612/0xba0
 ksys_write+0x150/0x270
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88816e5eb400
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 176 bytes inside of
 freed 256-byte region [ffff88816e5eb400, ffff88816e5eb500)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x16e5ea
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x57ff00000000040(head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000040 ffff888100041b40 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000
head: 057ff00000000040 ffff888100041b40 dead000000000100 dead000000000122
head: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000
head: 057ff00000000001 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 13095567876
 post_alloc_hook+0x1f9/0x250
 get_page_from_freelist+0x2205/0x2280
 __alloc_frozen_pages_noprof+0x217/0x5a0
 allocate_slab+0x7c/0x5e0
 refill_objects+0x2d5/0x350
 __pcs_replace_empty_main+0x2bf/0x6b0
 __kmalloc_cache_noprof+0x3a7/0x660
 bus_add_driver+0x162/0x670
 driver_register+0x23a/0x320
 usb_register_driver+0x1e4/0x390
 do_one_initcall+0x250/0x870
 do_initcall_level+0x10a/0x1a0
 do_initcalls+0x59/0xa0
 kernel_init_freeable+0x29d/0x3e0
 kernel_init+0x1d/0x1d0
 ret_from_fork+0x514/0xb70
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88816e5eb380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88816e5eb400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88816e5eb480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff88816e5eb500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88816e5eb580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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