netlink: 6 bytes leftover after parsing attributes in process `syz-executor.0'. general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 0 PID: 28394 Comm: syz-executor.0 Not tainted 5.14.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:br_switchdev_fdb_notify+0x2bf/0x340 net/bridge/br_switchdev.c:137 Code: c4 a8 00 00 00 5b 5d 41 5c 41 5d 41 5e 41 5f c3 e8 c6 9e 77 f9 49 8d 7e 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 71 4d 8b 6e 08 e9 4f ff ff ff e8 9d 9e 77 f9 31 c9 RSP: 0018:ffffc900022f7360 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc900016c1000 RDX: 0000000000000001 RSI: ffffffff87fdebba RDI: 0000000000000008 RBP: 1ffff9200045ee6d R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff87fdeaf7 R11: 0000000000000000 R12: 000000000000001c R13: ffff888021004c00 R14: 0000000000000000 R15: ffff888018977c28 FS: 00007fec2fb4e700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2e124000 CR3: 000000002b5ca000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: fdb_notify+0x159/0x190 net/bridge/br_fdb.c:798 br_fdb_external_learn_add+0x2cc/0x5c0 net/bridge/br_fdb.c:1303 __br_fdb_add+0x122/0xa40 net/bridge/br_fdb.c:1033 br_fdb_add+0x3da/0xcd0 net/bridge/br_fdb.c:1107 rtnl_fdb_add+0x45f/0xad0 net/core/rtnetlink.c:4046 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5563 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2403 ___sys_sendmsg+0xf3/0x170 net/socket.c:2457 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2486 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:00007fec2fb4e188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007fff118b70bf R14: 00007fec2fb4e300 R15: 0000000000022000 Modules linked in: ---[ end trace e68c615cccb187d5 ]--- RIP: 0010:br_switchdev_fdb_notify+0x2bf/0x340 net/bridge/br_switchdev.c:137 Code: c4 a8 00 00 00 5b 5d 41 5c 41 5d 41 5e 41 5f c3 e8 c6 9e 77 f9 49 8d 7e 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 71 4d 8b 6e 08 e9 4f ff ff ff e8 9d 9e 77 f9 31 c9 RSP: 0018:ffffc900022f7360 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc900016c1000 RDX: 0000000000000001 RSI: ffffffff87fdebba RDI: 0000000000000008 RBP: 1ffff9200045ee6d R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff87fdeaf7 R11: 0000000000000000 R12: 000000000000001c R13: ffff888021004c00 R14: 0000000000000000 R15: ffff888018977c28 FS: 00007fec2fb4e700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2e124000 CR3: 000000002b5ca000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400