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: 14100 Comm: syz-executor.1 Not tainted 5.8.0-rc4-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 80 52 50 fe 48 85 c0 48 89 c5 0f 84 c4 0e 00 00 e8 7f 4b 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:ffffc9001cd2fc90 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000010 RCX: ffffc90004092000 RDX: 0000000000000002 RSI: ffffffff87dd6c11 RDI: ffff888082a14850 RBP: ffff888082a14840 R08: 0000000000000001 R09: ffff8881f5e7fce3 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff88800f905c00 R14: ffffc9001cd2fec8 R15: 0000000000000000 FS: 00007f2e90055700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000741694 CR3: 00000001f5737000 CR4: 00000000001426e0 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:1908 [inline] new_sync_write+0x422/0x650 fs/read_write.c:503 vfs_write+0x59d/0x6b0 fs/read_write.c:578 ksys_write+0x12d/0x250 fs/read_write.c:631 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cba9 Code: Bad RIP value. RSP: 002b:00007f2e90054c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000050ce80 RCX: 000000000045cba9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000cc6 R14: 00000000004ca738 R15: 00007f2e900556d4 Modules linked in: ---[ end trace 7073f204189ed6c7 ]--- RIP: 0010:qrtr_endpoint_post+0x92/0x1010 net/qrtr/qrtr.c:440 Code: 44 89 e6 e8 80 52 50 fe 48 85 c0 48 89 c5 0f 84 c4 0e 00 00 e8 7f 4b 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:ffffc9001cd2fc90 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000010 RCX: ffffc90004092000 RDX: 0000000000000002 RSI: ffffffff87dd6c11 RDI: ffff888082a14850 RBP: ffff888082a14840 R08: 0000000000000001 R09: ffff8881f5e7fce3 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff88800f905c00 R14: ffffc9001cd2fec8 R15: 0000000000000000 FS: 00007f2e90055700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020010038 CR3: 00000001f5737000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400