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: 6811 Comm: syz-executor649 Not tainted 5.8.0-rc2-next-20200626-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:qrtr_endpoint_post+0x92/0x1010 net/qrtr/qrtr.c:440
Code: 44 89 e6 e8 30 a6 4f fe 48 85 c0 48 89 c5 0f 84 c4 0e 00 00 e8 9f c4 93 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 4a 0d 00 00
RSP: 0018:ffffc90000f87c60 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000010 RCX: ffffffff862fcde2
RDX: 0000000000000002 RSI: ffffffff87e02561 RDI: ffff8880a7cfdd10
RBP: ffff8880a7cfdd00 R08: 0000000000000001 R09: ffff888086d776e3
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880a96efb00 R14: ffffc90000f87ec8 R15: 0000000000000000
FS:  00000000011cf880(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004551b0 CR3: 00000000a687f000 CR4: 00000000001506e0
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:1877 [inline]
 new_sync_write+0x422/0x650 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: 0033:0x440249
Code: Bad RIP value.
RSP: 002b:00007ffc38eaac98 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffc38eaaca0 RCX: 0000000000440249
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00000000006ca018 R08: 000000000000000f R09: 65732f636f72702f
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b30
R13: 0000000000401bc0 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace 5678c85d81679d9f ]---
RIP: 0010:qrtr_endpoint_post+0x92/0x1010 net/qrtr/qrtr.c:440
Code: 44 89 e6 e8 30 a6 4f fe 48 85 c0 48 89 c5 0f 84 c4 0e 00 00 e8 9f c4 93 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 4a 0d 00 00
RSP: 0018:ffffc90000f87c60 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000010 RCX: ffffffff862fcde2
RDX: 0000000000000002 RSI: ffffffff87e02561 RDI: ffff8880a7cfdd10
RBP: ffff8880a7cfdd00 R08: 0000000000000001 R09: ffff888086d776e3
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880a96efb00 R14: ffffc90000f87ec8 R15: 0000000000000000
FS:  00000000011cf880(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004551b0 CR3: 00000000a687f000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400