general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 PID: 14242 Comm: syz-executor.3 Tainted: G W 5.14.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:br_ip4_multicast_query_received net/bridge/br_multicast.c:3079 [inline] RIP: 0010:br_ip4_multicast_query net/bridge/br_multicast.c:3149 [inline] RIP: 0010:br_multicast_ipv4_rcv net/bridge/br_multicast.c:3533 [inline] RIP: 0010:br_multicast_rcv+0x4597/0x61a0 net/bridge/br_multicast.c:3649 Code: ff ff 48 8b 85 f8 fe ff ff 4c 8d b0 b0 00 00 00 e8 fe d1 7b f9 48 8b 95 d8 fe ff ff 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 bc 12 00 00 48 8b 85 d8 fe ff ff 4c 89 f9 48 c1 RSP: 0018:ffffc9000181f420 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc9000fefc000 RDX: 0000000000000000 RSI: ffffffff87f9b772 RDI: ffff888069c3d070 RBP: ffffc9000181f5e0 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff87f992e2 R11: 0000000000000000 R12: 0000000000000001 R13: ffff888018062b40 R14: ffff888069c3d018 R15: ffff888069c3d0c0 FS: 00007fe07351e700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000529530 CR3: 00000000368fd000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: br_dev_xmit+0x6f6/0x1760 net/bridge/br_device.c:89 __netdev_start_xmit include/linux/netdevice.h:4946 [inline] netdev_start_xmit include/linux/netdevice.h:4960 [inline] xmit_one net/core/dev.c:3658 [inline] dev_hard_start_xmit+0x1eb/0x920 net/core/dev.c:3674 __dev_queue_xmit+0x29ee/0x36c0 net/core/dev.c:4273 packet_snd net/packet/af_packet.c:3016 [inline] packet_sendmsg+0x22fc/0x52b0 net/packet/af_packet.c:3044 sock_sendmsg_nosec net/socket.c:703 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:723 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2392 ___sys_sendmsg+0xf3/0x170 net/socket.c:2446 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2475 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665e9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe07351e188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000000000000 RSI: 0000000020000640 RDI: 0000000000000003 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffff6f6c2cf R14: 00007fe07351e300 R15: 0000000000022000 Modules linked in: ---[ end trace f387968a8d03ba5f ]--- RIP: 0010:br_ip4_multicast_query_received net/bridge/br_multicast.c:3079 [inline] RIP: 0010:br_ip4_multicast_query net/bridge/br_multicast.c:3149 [inline] RIP: 0010:br_multicast_ipv4_rcv net/bridge/br_multicast.c:3533 [inline] RIP: 0010:br_multicast_rcv+0x4597/0x61a0 net/bridge/br_multicast.c:3649 Code: ff ff 48 8b 85 f8 fe ff ff 4c 8d b0 b0 00 00 00 e8 fe d1 7b f9 48 8b 95 d8 fe ff ff 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 bc 12 00 00 48 8b 85 d8 fe ff ff 4c 89 f9 48 c1 RSP: 0018:ffffc9000181f420 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc9000fefc000 RDX: 0000000000000000 RSI: ffffffff87f9b772 RDI: ffff888069c3d070 RBP: ffffc9000181f5e0 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff87f992e2 R11: 0000000000000000 R12: 0000000000000001 R13: ffff888018062b40 R14: ffff888069c3d018 R15: ffff888069c3d0c0 FS: 00007fe07351e700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000529530 CR3: 00000000368fd000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400