netlink: 'syz-executor.3': attribute type 29 has an invalid length.
general protection fault, probably for non-canonical address 0xdffffc000000006c: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000360-0x0000000000000367]
CPU: 0 PID: 8910 Comm: syz-executor.3 Not tainted 5.17.0-rc8-syzkaller-02801-g2af7e566a861 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:br_mst_info_size+0xf5/0x270 net/bridge/br_mst.c:243
Code: 7c 5d f9 4c 8d 63 28 4c 89 e0 48 c1 e8 03 80 3c 28 00 0f 85 37 01 00 00 4c 8b 73 28 49 8d be 60 03 00 00 48 89 fa 48 c1 ea 03 <0f> b6 14 2a 84 d2 74 09 80 fa 01 0f 8e 28 01 00 00 45 0f b7 b6 60
RSP: 0018:ffffc900049bf0a8 EFLAGS: 00010207
RAX: 1ffff1100f70f805 RBX: ffff88807b87c000 RCX: ffffc900039f2000
RDX: 000000000000006c RSI: ffffffff881b457e RDI: 0000000000000364
RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff881520a7 R11: 0000000000000000 R12: ffff88807b87c028
R13: ffffc900049bf0d8 R14: 0000000000000004 R15: 0000000000000004
FS:  00007fb65bf8f700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcd489c9090 CR3: 0000000049bce000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 br_get_link_af_size_filtered+0x2c0/0xc10 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: 0033:0x7fb65d61a049
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:00007fb65bf8f168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fb65d72cf60 RCX: 00007fb65d61a049
RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000003
RBP: 00007fb65d67408d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffedd32dd8f R14: 00007fb65bf8f300 R15: 0000000000022000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:br_mst_info_size+0xf5/0x270 net/bridge/br_mst.c:243
Code: 7c 5d f9 4c 8d 63 28 4c 89 e0 48 c1 e8 03 80 3c 28 00 0f 85 37 01 00 00 4c 8b 73 28 49 8d be 60 03 00 00 48 89 fa 48 c1 ea 03 <0f> b6 14 2a 84 d2 74 09 80 fa 01 0f 8e 28 01 00 00 45 0f b7 b6 60
RSP: 0018:ffffc900049bf0a8 EFLAGS: 00010207
RAX: 1ffff1100f70f805 RBX: ffff88807b87c000 RCX: ffffc900039f2000
RDX: 000000000000006c RSI: ffffffff881b457e RDI: 0000000000000364
RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff881520a7 R11: 0000000000000000 R12: ffff88807b87c028
R13: ffffc900049bf0d8 R14: 0000000000000004 R15: 0000000000000004
FS:  00007fb65bf8f700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f222000 CR3: 0000000049bce000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	7c 5d                	jl     0x5f
   2:	f9                   	stc
   3:	4c 8d 63 28          	lea    0x28(%rbx),%r12
   7:	4c 89 e0             	mov    %r12,%rax
   a:	48 c1 e8 03          	shr    $0x3,%rax
   e:	80 3c 28 00          	cmpb   $0x0,(%rax,%rbp,1)
  12:	0f 85 37 01 00 00    	jne    0x14f
  18:	4c 8b 73 28          	mov    0x28(%rbx),%r14
  1c:	49 8d be 60 03 00 00 	lea    0x360(%r14),%rdi
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	0f b6 14 2a          	movzbl (%rdx,%rbp,1),%edx <-- trapping instruction
  2e:	84 d2                	test   %dl,%dl
  30:	74 09                	je     0x3b
  32:	80 fa 01             	cmp    $0x1,%dl
  35:	0f 8e 28 01 00 00    	jle    0x163
  3b:	45                   	rex.RB
  3c:	0f                   	.byte 0xf
  3d:	b7 b6                	mov    $0xb6,%bh
  3f:	60                   	(bad)