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Subjectgeneral protection fault in sctp_assoc_rwnd_increase
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Hello,

syzbot found the following crash on:

HEAD commit: a089e4fe Merge tag 'linux-watchdog-5.1-rc1' of git://www.l..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=144e9ee7200000
kernel config: https://syzkaller.appspot.com/x/.config?x=b613f0327d980b6b
dashboard link: https://syzkaller.appspot.com/bug?extid=85e0b422ff140b03672a
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
userspace arch: amd64
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12613b13200000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10f1884d200000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+85e0b422ff140b03672a@syzkaller.appspotmail.com

RAX: ffffffffffffffda RBX: 00000000006dbc38 RCX: 0000000000446679
RDX: 0000000000000066 RSI: 0000000000000084 RDI: 0000000000000003
RBP: 00000000006dbc30 R08: 0000000020000140 R09: 0000000000000038
R10: 0000000020000040 R11: 0000000000000246 R12: 00000000006dbc3c
R13: 00007f47f49ded90 R14: 0000000000000004 R15: 20c49ba5e353f7cf
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 7680 Comm: syz-executor161 Not tainted 5.0.0+ #18
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:sctp_assoc_rwnd_increase+0x34/0x520 net/sctp/associola.c:1498
Code: 41 54 49 89 fc 53 89 f3 48 83 ec 10 e8 95 90 f1 fa 49 8d bc 24 60 06
00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84
c0 74 08 3c 03 0f 8e 2f 04 00 00 45 8b ac 24 60 06
RSP: 0018:ffff88808da476f8 EFLAGS: 00010203
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 00000000000000cb RSI: ffffffff867ecd5b RDI: 000000000000065f
RBP: ffff88808da47730 R08: ffff88808c5d64c0 R09: ffff88808c5d6d88
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffffffffffff
R13: 0000000000000000 R14: ffff88808c4d6f00 R15: 0000000000000000
FS: 00007f47f49df700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000044 CR3: 0000000097508000 CR4: 00000000001406f0
Call Trace:
sctp_ulpevent_release_data net/sctp/ulpevent.c:1092 [inline]
sctp_ulpevent_free+0x21f/0x4e0 net/sctp/ulpevent.c:1129
sctp_queue_purge_ulpevents+0xc4/0x110 net/sctp/ulpevent.c:1146
sctp_close+0x148/0x860 net/sctp/socket.c:1515
inet_release+0x105/0x1f0 net/ipv4/af_inet.c:428
inet6_release+0x53/0x80 net/ipv6/af_inet6.c:473
__sock_release+0x1fe/0x2b0 net/socket.c:579
sock_release+0x18/0x20 net/socket.c:599
sctp_do_peeloff+0x38a/0x470 net/sctp/socket.c:5649
sctp_getsockopt_peeloff_common.isra.0+0x8e/0x270 net/sctp/socket.c:5665
sctp_getsockopt_peeloff net/sctp/socket.c:5707 [inline]
sctp_getsockopt net/sctp/socket.c:7802 [inline]
sctp_getsockopt+0x1ec1/0x6741 net/sctp/socket.c:7758
sock_common_getsockopt+0x9a/0xe0 net/core/sock.c:3079
__sys_getsockopt+0x168/0x250 net/socket.c:1960
__do_sys_getsockopt net/socket.c:1971 [inline]
__se_sys_getsockopt net/socket.c:1968 [inline]
__x64_sys_getsockopt+0xbe/0x150 net/socket.c:1968
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x446679
Code: e8 6c b4 02 00 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 2b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f47f49ded88 EFLAGS: 00000246 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 00000000006dbc38 RCX: 0000000000446679
RDX: 0000000000000066 RSI: 0000000000000084 RDI: 0000000000000003
RBP: 00000000006dbc30 R08: 0000000020000140 R09: 0000000000000038
R10: 0000000020000040 R11: 0000000000000246 R12: 00000000006dbc3c
R13: 00007f47f49ded90 R14: 0000000000000004 R15: 20c49ba5e353f7cf
Modules linked in:
---[ end trace dfa9a15945f164b7 ]---
RIP: 0010:sctp_assoc_rwnd_increase+0x34/0x520 net/sctp/associola.c:1498
Code: 41 54 49 89 fc 53 89 f3 48 83 ec 10 e8 95 90 f1 fa 49 8d bc 24 60 06
00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84
c0 74 08 3c 03 0f 8e 2f 04 00 00 45 8b ac 24 60 06
RSP: 0018:ffff88808da476f8 EFLAGS: 00010203
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 00000000000000cb RSI: ffffffff867ecd5b RDI: 000000000000065f
RBP: ffff88808da47730 R08: ffff88808c5d64c0 R09: ffff88808c5d6d88
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffffffffffff
R13: 0000000000000000 R14: ffff88808c4d6f00 R15: 0000000000000000
FS: 00007f47f49df700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000044 CR3: 0000000097508000 CR4: 00000000001406f0


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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