netlink: 'syz-executor.0': attribute type 29 has an invalid length. general protection fault, probably for non-canonical address 0xdffffc0000000058: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000002c0-0x00000000000002c7] CPU: 1 PID: 15458 Comm: syz-executor.0 Not tainted 5.17.0-rc8-syzkaller-02628-g351bdbb6419c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:br_mst_info_size+0x97/0x270 net/bridge/br_mst.c:242 Code: 00 00 31 c0 e8 fa 55 5e f9 31 c0 b9 40 00 00 00 4c 8d 6c 24 30 4c 89 ef f3 48 ab 48 8d 83 c0 02 00 00 48 89 04 24 48 c1 e8 03 <80> 3c 28 00 0f 85 ae 01 00 00 48 8b 83 c0 02 00 00 41 bf 04 00 00 RSP: 0018:ffffc9000ff4f0a8 EFLAGS: 00010202 RAX: 0000000000000058 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000040000 RSI: ffffffff881a6aa6 RDI: ffffc9000ff4f2d8 RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff8814462b R11: 0000000000000000 R12: 0000000000000000 R13: ffffc9000ff4f0d8 R14: 0000000000000328 R15: 00000000000080fe FS: 00007f3b24720700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fdb1165a1b8 CR3: 000000001a4fc000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: br_get_link_af_size_filtered+0x6e9/0xc00 net/bridge/br_netlink.c:123 rtnl_link_get_af_size net/core/rtnetlink.c:598 [inline] if_nlmsg_size+0x40c/0xa50 net/core/rtnetlink.c:1040 rtnl_calcit.isra.0+0x25f/0x460 net/core/rtnetlink.c:3780 rtnetlink_rcv_msg+0xa65/0xb80 net/core/rtnetlink.c:5937 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x543/0x7f0 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x904/0xe00 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:725 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2413 ___sys_sendmsg+0xf3/0x170 net/socket.c:2467 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2496 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: 0033:0x7f3b25dab049 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f3b24720168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f3b25ebdf60 RCX: 00007f3b25dab049 RDX: 0000000000000000 RSI: 0000000020002040 RDI: 0000000000000003 RBP: 00007f3b25e0508d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff46add4af R14: 00007f3b24720300 R15: 0000000000022000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:br_mst_info_size+0x97/0x270 net/bridge/br_mst.c:242 Code: 00 00 31 c0 e8 fa 55 5e f9 31 c0 b9 40 00 00 00 4c 8d 6c 24 30 4c 89 ef f3 48 ab 48 8d 83 c0 02 00 00 48 89 04 24 48 c1 e8 03 <80> 3c 28 00 0f 85 ae 01 00 00 48 8b 83 c0 02 00 00 41 bf 04 00 00 RSP: 0018:ffffc9000ff4f0a8 EFLAGS: 00010202 RAX: 0000000000000058 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000040000 RSI: ffffffff881a6aa6 RDI: ffffc9000ff4f2d8 RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff8814462b R11: 0000000000000000 R12: 0000000000000000 R13: ffffc9000ff4f0d8 R14: 0000000000000328 R15: 00000000000080fe FS: 00007f3b24720700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2c375bd718 CR3: 000000001a4fc000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 31 c0 xor %eax,%eax 4: e8 fa 55 5e f9 callq 0xf95e5603 9: 31 c0 xor %eax,%eax b: b9 40 00 00 00 mov $0x40,%ecx 10: 4c 8d 6c 24 30 lea 0x30(%rsp),%r13 15: 4c 89 ef mov %r13,%rdi 18: f3 48 ab rep stos %rax,%es:(%rdi) 1b: 48 8d 83 c0 02 00 00 lea 0x2c0(%rbx),%rax 22: 48 89 04 24 mov %rax,(%rsp) 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) <-- trapping instruction 2e: 0f 85 ae 01 00 00 jne 0x1e2 34: 48 8b 83 c0 02 00 00 mov 0x2c0(%rbx),%rax 3b: 41 rex.B 3c: bf .byte 0xbf 3d: 04 00 add $0x0,%al