Bluetooth: hci2: Dropping invalid advertising data
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BUG: KASAN: slab-out-of-bounds in hci_le_adv_report_evt net/bluetooth/hci_event.c:5600 [inline]
BUG: KASAN: slab-out-of-bounds in hci_le_meta_evt+0x38c9/0x3ff0 net/bluetooth/hci_event.c:5923
Read of size 1 at addr ffff8880a6476204 by task kworker/u5:3/8229

CPU: 0 PID: 8229 Comm: kworker/u5:3 Not tainted 5.8.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: hci2 hci_rx_work
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x18f/0x20d lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xae/0x436 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
 hci_le_adv_report_evt net/bluetooth/hci_event.c:5600 [inline]
 hci_le_meta_evt+0x38c9/0x3ff0 net/bluetooth/hci_event.c:5923
 hci_event_packet+0x2e25/0x87a8 net/bluetooth/hci_event.c:6192
 hci_rx_work+0x22e/0xb50 net/bluetooth/hci_core.c:4889
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Allocated by task 10482:
 save_stack+0x1b/0x40 mm/kasan/common.c:48
 set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:494
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0xae/0x550 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1084 [inline]
 bt_skb_alloc include/net/bluetooth/bluetooth.h:389 [inline]
 vhci_get_user drivers/bluetooth/hci_vhci.c:165 [inline]
 vhci_write+0xbd/0x450 drivers/bluetooth/hci_vhci.c:285
 call_write_iter include/linux/fs.h:1868 [inline]
 new_sync_write+0x422/0x650 fs/read_write.c:503
 vfs_write+0x59d/0x6b0 fs/read_write.c:578
 ksys_write+0x12d/0x250 fs/read_write.c:631
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 3905:
 save_stack+0x1b/0x40 mm/kasan/common.c:48
 set_track mm/kasan/common.c:56 [inline]
 kasan_set_free_info mm/kasan/common.c:316 [inline]
 __kasan_slab_free+0xf5/0x140 mm/kasan/common.c:455
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x103/0x2c0 mm/slab.c:3757
 skb_free_head net/core/skbuff.c:590 [inline]
 skb_release_data+0x6d9/0x910 net/core/skbuff.c:610
 skb_release_all net/core/skbuff.c:664 [inline]
 __kfree_skb net/core/skbuff.c:678 [inline]
 consume_skb net/core/skbuff.c:837 [inline]
 consume_skb+0xc2/0x160 net/core/skbuff.c:831
 skb_free_datagram+0x16/0xf0 net/core/datagram.c:325
 netlink_recvmsg+0x61e/0xee0 net/netlink/af_netlink.c:1998
 sock_recvmsg_nosec net/socket.c:885 [inline]
 sock_recvmsg net/socket.c:903 [inline]
 sock_recvmsg net/socket.c:899 [inline]
 ____sys_recvmsg+0x2c4/0x640 net/socket.c:2582
 ___sys_recvmsg+0x127/0x200 net/socket.c:2624
 __sys_recvmsg+0xe2/0x1a0 net/socket.c:2658
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff8880a6476000
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 4 bytes to the right of
 512-byte region [ffff8880a6476000, ffff8880a6476200)
The buggy address belongs to the page:
page:ffffea0002991d80 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880a6476400
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea00028ec888 ffffea0002870088 ffff8880aa000a80
raw: ffff8880a6476400 ffff8880a6476000 0000000100000003 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a6476100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880a6476180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880a6476200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff8880a6476280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880a6476300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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