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: 6812 Comm: syz-executor860 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:ffffc90001e67c48 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000010 RCX: ffffffff86237e4b RDX: 0000000000000002 RSI: ffffffff87d55471 RDI: ffff888096e1a050 RBP: ffff888096e1a040 R08: ffff8880a26dc440 R09: ffffed101214bb9d R10: ffff888090a5dce3 R11: ffffed101214bb9c R12: 0000000000000000 R13: ffff88809a7a6600 R14: ffffc90001e67eb0 R15: 0000000000000000 FS: 00000000018be880(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000006cb090 CR3: 00000000a26f7000 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_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x4411a9 Code: e8 fc ab 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 9b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffede424498 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004411a9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00000000006cb018 R08: 00000000004002c8 R09: 00000000004002c8 R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000401fd0 R13: 0000000000402060 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 14a0c5691a2d76af ]--- 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:ffffc90001e67c48 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000010 RCX: ffffffff86237e4b RDX: 0000000000000002 RSI: ffffffff87d55471 RDI: ffff888096e1a050 RBP: ffff888096e1a040 R08: ffff8880a26dc440 R09: ffffed101214bb9d R10: ffff888090a5dce3 R11: ffffed101214bb9c R12: 0000000000000000 R13: ffff88809a7a6600 R14: ffffc90001e67eb0 R15: 0000000000000000 FS: 00000000018be880(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5ea403c168 CR3: 00000000a26f7000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400