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: 6795 Comm: syz-executor499 Not tainted 5.7.0-rc7-next-20200529-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:qrtr_endpoint_post+0x92/0xfa0 net/qrtr/qrtr.c:440
Code: 44 89 e6 e8 e0 cf 4d fe 48 85 c0 48 89 c5 0f 84 57 0e 00 00 e8 3f e5 99 f9 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 04 02 48 89 da 83 e2 07 38 d0 7f 08 84 c0 0f 85 f7 0c 00 00
RSP: 0018:ffffc90001787c60 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000010 RCX: ffffffff8626e89b
RDX: 0000000000000002 RSI: ffffffff87d91661 RDI: ffff88809e7ea3d0
RBP: ffff88809e7ea3c0 R08: ffff888094e38440 R09: ffffed1010d0061d
R10: ffff8880868030e3 R11: ffffed1010d0061c R12: 0000000000000000
R13: ffff8880a91ae400 R14: ffffc90001787ec8 R15: 0000000000000000
FS:  0000000001107880(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000000 CR3: 00000000a2975000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 qrtr_tun_write_iter+0xf5/0x180 net/qrtr/tun.c:92
 call_write_iter include/linux/fs.h:1926 [inline]
 new_sync_write+0x426/0x650 fs/read_write.c:484
 __vfs_write+0xc9/0x100 fs/read_write.c:497
 vfs_write+0x268/0x5d0 fs/read_write.c:559
 ksys_write+0x12d/0x250 fs/read_write.c:612
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4401b9
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fffa1a846b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004401b9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a40
R13: 0000000000401ad0 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace d1d5cbd5a510f406 ]---
RIP: 0010:qrtr_endpoint_post+0x92/0xfa0 net/qrtr/qrtr.c:440
Code: 44 89 e6 e8 e0 cf 4d fe 48 85 c0 48 89 c5 0f 84 57 0e 00 00 e8 3f e5 99 f9 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 04 02 48 89 da 83 e2 07 38 d0 7f 08 84 c0 0f 85 f7 0c 00 00
RSP: 0018:ffffc90001787c60 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000010 RCX: ffffffff8626e89b
RDX: 0000000000000002 RSI: ffffffff87d91661 RDI: ffff88809e7ea3d0
RBP: ffff88809e7ea3c0 R08: ffff888094e38440 R09: ffffed1010d0061d
R10: ffff8880868030e3 R11: ffffed1010d0061c R12: 0000000000000000
R13: ffff8880a91ae400 R14: ffffc90001787ec8 R15: 0000000000000000
FS:  0000000001107880(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7742ed7000 CR3: 00000000a2975000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400