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Subjectgeneral protection fault in sctp_sched_prio_sched
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Hello,

syzbot found the following crash on:

HEAD commit: 35fc07ae Merge branch 'tcp-add-three-static-keys'
git tree: net
console output: https://syzkaller.appspot.com/x/log.txt?x=118e5caea00000
kernel config: https://syzkaller.appspot.com/x/.config?x=e8b7a9cd7feeb720
dashboard link: https://syzkaller.appspot.com/bug?extid=c1a380d42b190ad1e559
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11551df1a00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12417076a00000

The bug was bisected to:

commit 4ff40b86262b73553ee47cc3784ce8ba0f220bd8
Author: Xin Long <lucien.xin@gmail.com>
Date: Mon Jan 21 18:42:09 2019 +0000

sctp: set chunk transport correctly when it's a new asoc

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=104d1df1a00000
final crash: https://syzkaller.appspot.com/x/report.txt?x=124d1df1a00000
console output: https://syzkaller.appspot.com/x/log.txt?x=144d1df1a00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+c1a380d42b190ad1e559@syzkaller.appspotmail.com
Fixes: 4ff40b86262b ("sctp: set chunk transport correctly when it's a new
asoc")

kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 8330 Comm: syz-executor666 Not tainted 5.2.0-rc3+ #52
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:sctp_sched_prio_sched+0x96/0x6f0 net/sctp/stream_sched_prio.c:132
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 0d 05 00 00 48 b8 00 00 00 00
00 fc ff df 4c 8b 73 50 4d 8d 6e 20 4c 89 ea 48 c1 ea 03 <80> 3c 02 00 0f
85 f4 04 00 00 4d 8b 7e 20 4d 85 ff 0f 84 f8 00 00
RSP: 0018:ffff88809e4e7448 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8880a9533b80 RCX: 1ffff11010347201
RDX: 0000000000000004 RSI: ffffffff8696a77e RDI: ffff8880a9533bd0
RBP: ffff88809e4e7488 R08: ffff88808bf8e300 R09: ffff88809e4e7580
R10: ffffed1013c9cee2 R11: 0000000000000003 R12: ffff8880a9533bc0
R13: 0000000000000020 R14: 0000000000000000 R15: ffff8880a4e92380
FS: 00007f48c9337700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f48c9315e78 CR3: 000000009db54000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
sctp_sched_prio_enqueue+0x117/0x170 net/sctp/stream_sched_prio.c:243
sctp_cmd_send_msg net/sctp/sm_sideeffect.c:1101 [inline]
sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1748 [inline]
sctp_side_effects net/sctp/sm_sideeffect.c:1184 [inline]
sctp_do_sm+0x2fd0/0x5190 net/sctp/sm_sideeffect.c:1155
sctp_primitive_SEND+0xa0/0xd0 net/sctp/primitive.c:163
sctp_sendmsg_to_asoc+0x1118/0x1f10 net/sctp/socket.c:1944
sctp_sendmsg+0x109a/0x17d0 net/sctp/socket.c:2102
inet_sendmsg+0x141/0x5d0 net/ipv4/af_inet.c:798
sock_sendmsg_nosec net/socket.c:646 [inline]
sock_sendmsg+0xd7/0x130 net/socket.c:665
sock_write_iter+0x27c/0x3e0 net/socket.c:994
call_write_iter include/linux/fs.h:1872 [inline]
new_sync_write+0x4d3/0x770 fs/read_write.c:483
__vfs_write+0xe1/0x110 fs/read_write.c:496
vfs_write+0x20c/0x580 fs/read_write.c:558
ksys_write+0x14f/0x290 fs/read_write.c:611
__do_sys_write fs/read_write.c:623 [inline]
__se_sys_write fs/read_write.c:620 [inline]
__x64_sys_write+0x73/0xb0 fs/read_write.c:620
do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x447a69
Code: e8 cc e7 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 3b 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f48c9336d88 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00000000006ddc38 RCX: 0000000000447a69
RDX: 0000000000010094 RSI: 0000000020000040 RDI: 0000000000000003
RBP: 00000000006ddc30 R08: 00007f48c9337700 R09: 0000000000000000
R10: 00007f48c9337700 R11: 0000000000000246 R12: 00000000006ddc3c
R13: 00007f48c9336d90 R14: 00007f48c93379c0 R15: 00000000006ddc3c
Modules linked in:
---[ end trace 01e405583d741588 ]---
RIP: 0010:sctp_sched_prio_sched+0x96/0x6f0 net/sctp/stream_sched_prio.c:132
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 0d 05 00 00 48 b8 00 00 00 00
00 fc ff df 4c 8b 73 50 4d 8d 6e 20 4c 89 ea 48 c1 ea 03 <80> 3c 02 00 0f
85 f4 04 00 00 4d 8b 7e 20 4d 85 ff 0f 84 f8 00 00
RSP: 0018:ffff88809e4e7448 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8880a9533b80 RCX: 1ffff11010347201
RDX: 0000000000000004 RSI: ffffffff8696a77e RDI: ffff8880a9533bd0
RBP: ffff88809e4e7488 R08: ffff88808bf8e300 R09: ffff88809e4e7580
R10: ffffed1013c9cee2 R11: 0000000000000003 R12: ffff8880a9533bc0
R13: 0000000000000020 R14: 0000000000000000 R15: ffff8880a4e92380
FS: 00007f48c9337700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000460687 CR3: 000000009db54000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches

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