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: 8074 Comm: syz-executor.0 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+0x92/0x1010 net/qrtr/qrtr.c:440
Code: 44 89 e6 e8 c0 52 50 fe 48 85 c0 48 89 c5 0f 84 c4 0e 00 00 e8 df 66 96 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:ffffc90016d7fc48 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000010 RCX: ffffc90003e71000
RDX: 0000000000000002 RSI: ffffffff87dd5081 RDI: ffff88809ff2fa50
RBP: ffff88809ff2fa40 R08: 0000000000000001 R09: ffff888052fc4ce3
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880a3a61300 R14: ffffc90016d7feb0 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880ae700000(0063) knlGS:00000000f5dc3b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000002cf22000 CR3: 0000000091114000 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:1907 [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_32_irqs_on+0x3f/0x60 arch/x86/entry/common.c:403
 __do_fast_syscall_32 arch/x86/entry/common.c:448 [inline]
 do_fast_syscall_32+0x7f/0x120 arch/x86/entry/common.c:474
 entry_SYSENTER_compat+0x6d/0x7c arch/x86/entry/entry_64_compat.S:138
RIP: 0023:0xf7fc8569
Code: Bad RIP value.
RSP: 002b:00000000f5dc30cc EFLAGS: 00000296 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace 0956d556e23ce9be ]---
RIP: 0010:qrtr_endpoint_post+0x92/0x1010 net/qrtr/qrtr.c:440
Code: 44 89 e6 e8 c0 52 50 fe 48 85 c0 48 89 c5 0f 84 c4 0e 00 00 e8 df 66 96 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:ffffc90016d7fc48 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000010 RCX: ffffc90003e71000
RDX: 0000000000000002 RSI: ffffffff87dd5081 RDI: ffff88809ff2fa50
RBP: ffff88809ff2fa40 R08: 0000000000000001 R09: ffff888052fc4ce3
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880a3a61300 R14: ffffc90016d7feb0 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880ae600000(0063) knlGS:00000000f5dc3b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00007fd350626000 CR3: 0000000091114000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400