Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
==================================================================
BUG: KASAN: use-after-free in skb_dst_drop include/net/dst.h:297 [inline]
BUG: KASAN: use-after-free in skb_release_head_state+0x1b2/0x1f0 net/core/skbuff.c:612
Read of size 8 at addr ffff8880966a4a98 by task kworker/u4:0/5

CPU: 1 PID: 5 Comm: kworker/u4:0 Not tainted 4.14.173-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound flush_to_ldisc
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xf7/0x13b lib/dump_stack.c:58
 print_address_description.cold.7+0x9/0x1c9 mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report.cold.8+0x11a/0x2d3 mm/kasan/report.c:409
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430
 skb_dst_drop include/net/dst.h:297 [inline]
 skb_release_head_state+0x1b2/0x1f0 net/core/skbuff.c:612
 skb_release_all+0xd/0x50 net/core/skbuff.c:629
 __kfree_skb net/core/skbuff.c:645 [inline]
 kfree_skb+0x8a/0x2b0 net/core/skbuff.c:663
 h5_reset_rx+0x3d/0xf0 drivers/bluetooth/hci_h5.c:499
 h5_rx_3wire_hdr+0x287/0x350 drivers/bluetooth/hci_h5.c:409
 h5_recv+0x246/0x410 drivers/bluetooth/hci_h5.c:532
 hci_uart_tty_receive+0x1ce/0x460 drivers/bluetooth/hci_ldisc.c:616
 tty_ldisc_receive_buf+0xff/0x1b0 drivers/tty/tty_buffer.c:459
 tty_port_default_receive_buf+0x5f/0x90 drivers/tty/tty_port.c:37
 receive_buf drivers/tty/tty_buffer.c:475 [inline]
 flush_to_ldisc+0x197/0x390 drivers/tty/tty_buffer.c:527
 process_one_work+0x79e/0x16c0 kernel/workqueue.c:2114
 worker_thread+0xcc/0xee0 kernel/workqueue.c:2248
 kthread+0x338/0x400 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

Allocated by task 5:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:551
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489
 kmem_cache_alloc_node+0x144/0x790 mm/slab.c:3642
 __alloc_skb+0x92/0x500 net/core/skbuff.c:193
 alloc_skb include/linux/skbuff.h:980 [inline]
 bt_skb_alloc include/net/bluetooth/bluetooth.h:336 [inline]
 h5_rx_pkt_start+0xba/0x270 drivers/bluetooth/hci_h5.c:443
 h5_recv+0x246/0x410 drivers/bluetooth/hci_h5.c:532
 hci_uart_tty_receive+0x1ce/0x460 drivers/bluetooth/hci_ldisc.c:616
 tty_ldisc_receive_buf+0xff/0x1b0 drivers/tty/tty_buffer.c:459
 tty_port_default_receive_buf+0x5f/0x90 drivers/tty/tty_port.c:37
 receive_buf drivers/tty/tty_buffer.c:475 [inline]
 flush_to_ldisc+0x197/0x390 drivers/tty/tty_buffer.c:527
 process_one_work+0x79e/0x16c0 kernel/workqueue.c:2114
 worker_thread+0xcc/0xee0 kernel/workqueue.c:2248
 kthread+0x338/0x400 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

Freed by task 25465:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3496 [inline]
 kmem_cache_free+0x80/0x2d0 mm/slab.c:3758
 kfree_skbmem+0x88/0xf0 net/core/skbuff.c:586
 __kfree_skb net/core/skbuff.c:646 [inline]
 kfree_skb+0x92/0x2b0 net/core/skbuff.c:663
 h5_reset_rx+0x3d/0xf0 drivers/bluetooth/hci_h5.c:499
 h5_rx_3wire_hdr+0x287/0x350 drivers/bluetooth/hci_h5.c:409
 h5_recv+0x246/0x410 drivers/bluetooth/hci_h5.c:532
 hci_uart_tty_receive+0x1ce/0x460 drivers/bluetooth/hci_ldisc.c:616
 tiocsti drivers/tty/tty_io.c:2186 [inline]
 tty_ioctl+0x625/0x1260 drivers/tty/tty_io.c:2572
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x180/0xfb0 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x74/0x80 fs/ioctl.c:692
 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

The buggy address belongs to the object at ffff8880966a4a40
 which belongs to the cache skbuff_head_cache of size 232
The buggy address is located 88 bytes inside of
 232-byte region [ffff8880966a4a40, ffff8880966a4b28)
The buggy address belongs to the page:
page:ffffea000259a900 count:1 mapcount:0 mapping:ffff8880966a4040 index:0x0
flags: 0x1fffc0000000100(slab)
raw: 01fffc0000000100 ffff8880966a4040 0000000000000000 000000010000000c
raw: ffffea000264e260 ffffea000248cda0 ffff88821b720540 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880966a4980: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc
 ffff8880966a4a00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
>ffff8880966a4a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff8880966a4b00: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc
 ffff8880966a4b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum