general protection fault, probably for non-canonical address 0xdffffc0000000018: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000000c0-0x00000000000000c7] CPU: 0 PID: 16319 Comm: kworker/u4:2 Not tainted 5.8.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound flush_to_ldisc RIP: 0010:skb_tail_pointer include/linux/skbuff.h:2178 [inline] RIP: 0010:skb_put+0x2b/0x180 net/core/skbuff.c:1860 Code: 56 41 55 41 54 41 89 f4 55 48 89 fd 53 e8 8d 09 46 fb 48 8d bd c0 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 34 01 00 00 48 8d bd b8 00 00 00 4c 8b ad c0 00 RSP: 0000:ffffc90004b87aa8 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff888088204c00 RCX: ffffffff859e0054 RDX: 0000000000000018 RSI: ffffffff862db073 RDI: 00000000000000c0 RBP: 0000000000000000 R08: 0000000000000000 R09: ffff88808820401f R10: 00000000000000db R11: 0000000000000000 R12: 0000000000000001 R13: ffff888090b1302a R14: ffff888088204d10 R15: ffff888088204d7c FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6607ad1000 CR3: 00000000a25b1000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: skb_put_data include/linux/skbuff.h:2258 [inline] bcsp_unslip_one_byte drivers/bluetooth/hci_bcsp.c:436 [inline] bcsp_recv+0xa76/0x1460 drivers/bluetooth/hci_bcsp.c:598 hci_uart_tty_receive+0x270/0x740 drivers/bluetooth/hci_ldisc.c:613 tty_ldisc_receive_buf+0x14a/0x190 drivers/tty/tty_buffer.c:465 tty_port_default_receive_buf+0x6e/0xa0 drivers/tty/tty_port.c:38 receive_buf drivers/tty/tty_buffer.c:481 [inline] flush_to_ldisc+0x20d/0x380 drivers/tty/tty_buffer.c:533 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 Modules linked in: ---[ end trace 7455e5f3e42b4824 ]--- RIP: 0010:skb_tail_pointer include/linux/skbuff.h:2178 [inline] RIP: 0010:skb_put+0x2b/0x180 net/core/skbuff.c:1860 Code: 56 41 55 41 54 41 89 f4 55 48 89 fd 53 e8 8d 09 46 fb 48 8d bd c0 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 34 01 00 00 48 8d bd b8 00 00 00 4c 8b ad c0 00 RSP: 0000:ffffc90004b87aa8 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff888088204c00 RCX: ffffffff859e0054 RDX: 0000000000000018 RSI: ffffffff862db073 RDI: 00000000000000c0 RBP: 0000000000000000 R08: 0000000000000000 R09: ffff88808820401f R10: 00000000000000db R11: 0000000000000000 R12: 0000000000000001 R13: ffff888090b1302a R14: ffff888088204d10 R15: ffff888088204d7c FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000517800 CR3: 0000000055919000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400