general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
CPU: 1 PID: 20974 Comm: syz-executor.2 Not tainted 5.8.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:qrtr_endpoint_post+0x8f/0x1110 net/qrtr/qrtr.c:440
Code: 44 89 ee ba 20 0a 00 00 e8 2e d6 4f fe 48 85 c0 0f 84 5c 02 00 00 49 89 c7 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <8a> 04 08 84 c0 0f 85 7d 09 00 00 4d 8d 77 28 41 0f b6 1c 24 48 89
RSP: 0018:ffffc9000cfffa80 EFLAGS: 00010202
RAX: 0000000000000002 RBX: ffff8880a8559a08 RCX: dffffc0000000000
RDX: ffffc9000d83a000 RSI: 0000000000000077 RDI: ffff88808e7c0738
RBP: ffff8880a78b8800 R08: ffffffff866450ac R09: ffffed10089adaed
R10: ffffed10089adaed R11: 0000000000000000 R12: 0000000000000010
R13: 0000000000000000 R14: ffffc9000cfffb38 R15: ffff88808e7c0680
FS:  00007f6c19f63700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000097acd000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 qrtr_tun_write_iter+0xc6/0x120 net/qrtr/tun.c:92
 call_write_iter include/linux/fs.h:1907 [inline]
 new_sync_write fs/read_write.c:484 [inline]
 __vfs_write+0x52f/0x6e0 fs/read_write.c:497
 __kernel_write+0x120/0x350 fs/read_write.c:516
 write_pipe_buf+0xf9/0x150 fs/splice.c:799
 splice_from_pipe_feed fs/splice.c:502 [inline]
 __splice_from_pipe+0x351/0x8b0 fs/splice.c:626
 splice_from_pipe fs/splice.c:661 [inline]
 default_file_splice_write fs/splice.c:811 [inline]
 do_splice_from fs/splice.c:847 [inline]
 do_splice+0xf1b/0x1a50 fs/splice.c:1144
 __do_sys_splice fs/splice.c:1419 [inline]
 __se_sys_splice fs/splice.c:1401 [inline]
 __x64_sys_splice+0x14f/0x1f0 fs/splice.c:1401
 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cb29
Code: Bad RIP value.
RSP: 002b:00007f6c19f62c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 00000000005091a0 RCX: 000000000045cb29
RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 000000000078bf00 R08: 00000005fffffffd R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000bed R14: 00000000004ceef8 R15: 00007f6c19f636d4
Modules linked in:
---[ end trace 36964da023eb08a5 ]---
RIP: 0010:qrtr_endpoint_post+0x8f/0x1110 net/qrtr/qrtr.c:440
Code: 44 89 ee ba 20 0a 00 00 e8 2e d6 4f fe 48 85 c0 0f 84 5c 02 00 00 49 89 c7 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <8a> 04 08 84 c0 0f 85 7d 09 00 00 4d 8d 77 28 41 0f b6 1c 24 48 89
RSP: 0018:ffffc9000cfffa80 EFLAGS: 00010202
RAX: 0000000000000002 RBX: ffff8880a8559a08 RCX: dffffc0000000000
RDX: ffffc9000d83a000 RSI: 0000000000000077 RDI: ffff88808e7c0738
RBP: ffff8880a78b8800 R08: ffffffff866450ac R09: ffffed10089adaed
R10: ffffed10089adaed R11: 0000000000000000 R12: 0000000000000010
R13: 0000000000000000 R14: ffffc9000cfffb38 R15: ffff88808e7c0680
FS:  00007f6c19f63700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff908421000 CR3: 0000000097acd000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400