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BUG: KASAN: slab-use-after-free in l2cap_sock_ready_cb+0xd5/0x140
Read of size 8 at addr ffff888117f72188 by task kworker/u11:3/5865

CPU: 0 UID: 0 PID: 5865 Comm: kworker/u11:3 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
Workqueue: hci0 hci_rx_work
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 print_report+0xca/0x240
 kasan_report+0x118/0x150
 l2cap_sock_ready_cb+0xd5/0x140
 l2cap_le_start+0xb0d/0x13b0
 l2cap_connect_cfm+0x6be/0x1040
 hci_connect_cfm+0x95/0x140
 le_conn_complete_evt+0xcd3/0x1220
 hci_le_conn_complete_evt+0x187/0x450
 hci_event_packet+0x78f/0x1200
 hci_rx_work+0x46a/0xe80
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>

Allocated by task 7860:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_noprof+0x27a/0x4f0
 sk_prot_alloc+0xe7/0x220
 sk_alloc+0x3a/0x370
 bt_sock_alloc+0x3b/0x310
 l2cap_sock_create+0x147/0x300
 bt_sock_create+0x163/0x240
 __sock_create+0x4b3/0x9f0
 __sys_socket+0xd7/0x1b0
 __x64_sys_socket+0x7a/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 7863:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5b/0x80
 kfree+0x18e/0x440
 __sk_destruct+0x4e1/0x660
 l2cap_sock_release+0x192/0x210
 sock_close+0xc3/0x240
 __fput+0x44c/0xa70
 task_work_run+0x1d4/0x260
 do_exit+0x6b5/0x2300
 do_group_exit+0x21c/0x2d0
 get_signal+0x1286/0x1340
 arch_do_signal_or_restart+0x9a/0x750
 exit_to_user_mode_loop+0x75/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888117f72000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 392 bytes inside of
 freed 2048-byte region [ffff888117f72000, ffff888117f72800)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x117f70
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0x57ff00000000040(head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000040 ffff88801a442000 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000
head: 057ff00000000040 ffff88801a442000 0000000000000000 dead000000000001
head: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000
head: 057ff00000000003 ffffea00045fdc01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5853, tgid 5853 (syz-executor), ts 64983451722, free_ts 0
 post_alloc_hook+0x240/0x2a0
 get_page_from_freelist+0x21e4/0x22c0
 __alloc_frozen_pages_noprof+0x181/0x370
 alloc_pages_mpol+0x232/0x4a0
 allocate_slab+0x8a/0x370
 ___slab_alloc+0xbeb/0x1420
 __kmalloc_cache_noprof+0x296/0x3d0
 nbp_vlan_add+0x20f/0x3c0
 nbp_vlan_init+0x35b/0x440
 br_add_if+0xaa1/0xec0
 do_set_master+0x533/0x6d0
 do_setlink+0xcf0/0x41c0
 rtnl_newlink+0x160b/0x1c70
 rtnetlink_rcv_msg+0x7cf/0xb70
 netlink_rcv_skb+0x208/0x470
 netlink_unicast+0x82f/0x9e0
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888117f72080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888117f72100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888117f72180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                      ^
 ffff888117f72200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888117f72280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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