[syzbot] general protection fault in tls_init

[syzbot <syzbot+1fd9b69cde42967d1add@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    3498e7f2bb41 Merge tag '5.16-rc2-ksmbd-fixes' of git://git..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17e50a29b00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=33f08a46bc9aea3d
dashboard link: https://syzkaller.appspot.com/bug?extid=1fd9b69cde42967d1add
compiler:       Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1fd9b69cde42967d1add@syzkaller.appspotmail.com

general protection fault, probably for non-canonical address 0xdffffc0000000004: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027]
CPU: 1 PID: 1083 Comm: syz-executor.3 Not tainted 5.16.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:tls_build_proto net/tls/tls_main.c:776 [inline]
RIP: 0010:tls_init+0x44b/0x940 net/tls/tls_main.c:844
Code: 8d 9d 80 04 00 00 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 a3 15 fa f8 48 8b 1b 48 83 c3 20 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 86 15 fa f8 48 8b 1b ba e0 00 00
RSP: 0018:ffffc90018ba79e8 EFLAGS: 00010202
RAX: 0000000000000004 RBX: 0000000000000020 RCX: 0000000000000000
RDX: 00000000000001b8 RSI: ffffffff8dc8dad8 RDI: ffffffff91040ae0
RBP: ffffffff8dc8d920 R08: dffffc0000000000 R09: fffffbfff2208158
R10: 0000000000000004 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff888077c9b300 R14: 1ffff1100ef93665 R15: ffff888077c9b328
FS:  00007f618497c700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5df59d8004 CR3: 00000000a43f0000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __tcp_set_ulp net/ipv4/tcp_ulp.c:139 [inline]
 tcp_set_ulp+0x428/0x4c0 net/ipv4/tcp_ulp.c:160
 do_tcp_setsockopt+0x455/0x37c0 net/ipv4/tcp.c:3391
 mptcp_setsockopt+0x1b47/0x2400 net/mptcp/sockopt.c:638
 __sys_setsockopt+0x552/0x980 net/socket.c:2176
 __do_sys_setsockopt net/socket.c:2187 [inline]
 __se_sys_setsockopt net/socket.c:2184 [inline]
 __x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2184
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f6187427ae9
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:00007f618497c188 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f618753b020 RCX: 00007f6187427ae9
RDX: 000000000000001f RSI: 0000000000000006 RDI: 0000000000000003
RBP: 00007f6187481f6d R08: 0000000000000004 R09: 0000000000000000
R10: 0000000020000100 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe6784d25f R14: 00007f618497c300 R15: 0000000000022000
 </TASK>
Modules linked in:
---[ end trace db2630bf612a55f1 ]---
RIP: 0010:tls_build_proto net/tls/tls_main.c:776 [inline]
RIP: 0010:tls_init+0x44b/0x940 net/tls/tls_main.c:844
Code: 8d 9d 80 04 00 00 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 a3 15 fa f8 48 8b 1b 48 83 c3 20 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 86 15 fa f8 48 8b 1b ba e0 00 00
RSP: 0018:ffffc90018ba79e8 EFLAGS: 00010202
RAX: 0000000000000004 RBX: 0000000000000020 RCX: 0000000000000000
RDX: 00000000000001b8 RSI: ffffffff8dc8dad8 RDI: ffffffff91040ae0
RBP: ffffffff8dc8d920 R08: dffffc0000000000 R09: fffffbfff2208158
R10: 0000000000000004 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff888077c9b300 R14: 1ffff1100ef93665 R15: ffff888077c9b328
FS:  00007f618497c700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020001580 CR3: 00000000a43f0000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	8d 9d 80 04 00 00    	lea    0x480(%rbp),%ebx
   6:	48 89 d8             	mov    %rbx,%rax
   9:	48 c1 e8 03          	shr    $0x3,%rax
   d:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1)
  12:	74 08                	je     0x1c
  14:	48 89 df             	mov    %rbx,%rdi
  17:	e8 a3 15 fa f8       	callq  0xf8fa15bf
  1c:	48 8b 1b             	mov    (%rbx),%rbx
  1f:	48 83 c3 20          	add    $0x20,%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 86 15 fa f8       	callq  0xf8fa15bf
  39:	48 8b 1b             	mov    (%rbx),%rbx
  3c:	ba                   	.byte 0xba
  3d:	e0 00                	loopne 0x3f


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