syzbot

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BUG: KASAN: slab-out-of-bounds in hci_le_direct_adv_report_evt net/bluetooth/hci_event.c:5875 [inline]
BUG: KASAN: slab-out-of-bounds in hci_le_meta_evt+0x3937/0x3ff0 net/bluetooth/hci_event.c:5939
Read of size 1 at addr ffff888092006e0c by task kworker/u5:2/6852

CPU: 1 PID: 6852 Comm: kworker/u5:2 Not tainted 5.9.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: hci0 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/0x497 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_direct_adv_report_evt net/bluetooth/hci_event.c:5875 [inline]
 hci_le_meta_evt+0x3937/0x3ff0 net/bluetooth/hci_event.c:5939
 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 6846:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0xae/0x550 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1085 [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:1882 [inline]
 new_sync_write+0x422/0x650 fs/read_write.c:503
 vfs_write+0x5ad/0x730 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

The buggy address belongs to the object at ffff888092006c00
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 12 bytes to the right of
 512-byte region [ffff888092006c00, ffff888092006e00)
The buggy address belongs to the page:
page:00000000bf4cfd8b refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x92006
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea00027d9e48 ffffea000278e408 ffff8880aa040600
raw: 0000000000000000 ffff888092006000 0000000100000004 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888092006d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888092006d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888092006e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                      ^
 ffff888092006e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888092006f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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