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: 6804 Comm: syz-executor517 Not tainted 5.7.0-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 80 27 4e fe 48 85 c0 48 89 c5 0f 84 57 0e 00 00 e8 4f 7a 9e 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:ffffc90001577c38 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000010 RCX: ffffffff86237e4b
RDX: 0000000000000002 RSI: ffffffff87d55471 RDI: ffff88809d1d1e10
RBP: ffff88809d1d1e00 R08: ffff888095a3c400 R09: ffffed101229fa1d
R10: ffff8880914fd0e3 R11: ffffed101229fa1c R12: 0000000000000000
R13: ffff8880a84d6f00 R14: ffffc90001577ea0 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880ae700000(0063) knlGS:0000000009707840
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000020000000 CR3: 0000000094f12000 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:1917 [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_32_irqs_on arch/x86/entry/common.c:337 [inline]
 do_fast_syscall_32+0x270/0xe90 arch/x86/entry/common.c:396
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
Modules linked in:
---[ end trace 71f87235be4e0c3c ]---
RIP: 0010:qrtr_endpoint_post+0x92/0xfa0 net/qrtr/qrtr.c:440
Code: 44 89 e6 e8 80 27 4e fe 48 85 c0 48 89 c5 0f 84 57 0e 00 00 e8 4f 7a 9e 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:ffffc90001577c38 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000010 RCX: ffffffff86237e4b
RDX: 0000000000000002 RSI: ffffffff87d55471 RDI: ffff88809d1d1e10
RBP: ffff88809d1d1e00 R08: ffff888095a3c400 R09: ffffed101229fa1d
R10: ffff8880914fd0e3 R11: ffffed101229fa1c R12: 0000000000000000
R13: ffff8880a84d6f00 R14: ffffc90001577ea0 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880ae700000(0063) knlGS:0000000009707840
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000020000000 CR3: 0000000094f12000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400