Date:   Mon, 04 Feb 2019 08:33:03 -0800
From:   syzbot <syzbot+58e480e7b28f2d890bfd@...kaller.appspotmail.com>
To:     davem@...emloft.net, linux-kernel@...r.kernel.org,
        linux-sctp@...r.kernel.org, marcelo.leitner@...il.com,
        netdev@...r.kernel.org, nhorman@...driver.com,
        syzkaller-bugs@...glegroups.com, vyasevich@...il.com
Subject: KASAN: invalid-free in sctp_stream_free

Hello,

syzbot found the following crash on:

HEAD commit:    dc4c89997735 Add linux-next specific files for 20190201
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=17eb3dc4c00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=59aefae07c771af6
dashboard link: https://syzkaller.appspot.com/bug?extid=58e480e7b28f2d890bfd
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=117990e4c00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16758df8c00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+58e480e7b28f2d890bfd@...kaller.appspotmail.com

==================================================================
BUG: KASAN: double-free or invalid-free in sctp_stream_free+0xfa/0x190  
net/sctp/stream.c:187

CPU: 0 PID: 7775 Comm: syz-executor682 Not tainted 5.0.0-rc4-next-20190201  
#25
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
  __dump_stack lib/dump_stack.c:77 [inline]
  dump_stack+0x172/0x1f0 lib/dump_stack.c:113
  print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187
  kasan_report_invalid_free+0x65/0xa0 mm/kasan/report.c:278
  __kasan_slab_free+0x13a/0x150 mm/kasan/common.c:439
  kasan_slab_free+0xe/0x10 mm/kasan/common.c:468
  __cache_free mm/slab.c:3488 [inline]
  kfree+0xcf/0x230 mm/slab.c:3807
  sctp_stream_free+0xfa/0x190 net/sctp/stream.c:187
  sctp_association_free+0x235/0x79a net/sctp/associola.c:373
  sctp_cmd_delete_tcb net/sctp/sm_sideeffect.c:939 [inline]
  sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1353 [inline]
  sctp_side_effects net/sctp/sm_sideeffect.c:1220 [inline]
  sctp_do_sm+0x3c4e/0x5380 net/sctp/sm_sideeffect.c:1191
  sctp_assoc_bh_rcv+0x343/0x660 net/sctp/associola.c:1074
  sctp_inq_push+0x1ea/0x290 net/sctp/inqueue.c:95
  sctp_backlog_rcv+0x196/0xbe0 net/sctp/input.c:354
  sk_backlog_rcv include/net/sock.h:936 [inline]
  __release_sock+0x12e/0x3a0 net/core/sock.c:2309
  release_sock+0x59/0x1c0 net/core/sock.c:2825
  sctp_close+0x4a4/0x860 net/sctp/socket.c:1550
  inet_release+0x105/0x1f0 net/ipv4/af_inet.c:428
  __sock_release+0xd3/0x250 net/socket.c:579
  sock_close+0x1b/0x30 net/socket.c:1139
  __fput+0x2df/0x8d0 fs/file_table.c:278
  ____fput+0x16/0x20 fs/file_table.c:309
  task_work_run+0x14a/0x1c0 kernel/task_work.c:113
  exit_task_work include/linux/task_work.h:22 [inline]
  do_exit+0x90a/0x2fa0 kernel/exit.c:876
  do_group_exit+0x135/0x370 kernel/exit.c:980
  __do_sys_exit_group kernel/exit.c:991 [inline]
  __se_sys_exit_group kernel/exit.c:989 [inline]
  __x64_sys_exit_group+0x44/0x50 kernel/exit.c:989
  do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x43edd8
Code: Bad RIP value.
RSP: 002b:00007fff92021088 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043edd8
RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
RBP: 00000000004be688 R08: 00000000000000e7 R09: ffffffffffffffd0
R10: 0000000000000010 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 7775:
  save_stack+0x45/0xd0 mm/kasan/common.c:75
  set_track mm/kasan/common.c:87 [inline]
  __kasan_kmalloc mm/kasan/common.c:498 [inline]
  __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:471
  kasan_kmalloc+0x9/0x10 mm/kasan/common.c:506
  kmem_cache_alloc_trace+0x151/0x760 mm/slab.c:3610
  kmalloc include/linux/slab.h:548 [inline]
  kzalloc include/linux/slab.h:743 [inline]
  sctp_stream_init_ext+0x51/0x110 net/sctp/stream.c:172
  sctp_sendmsg_to_asoc+0x1273/0x17b0 net/sctp/socket.c:1896
  sctp_sendmsg+0x81f/0x17f0 net/sctp/socket.c:2113
  inet_sendmsg+0x147/0x5d0 net/ipv4/af_inet.c:798
  sock_sendmsg_nosec net/socket.c:621 [inline]
  sock_sendmsg+0xdd/0x130 net/socket.c:631
  ___sys_sendmsg+0x806/0x930 net/socket.c:2114
  __sys_sendmsg+0x105/0x1d0 net/socket.c:2152
  __do_sys_sendmsg net/socket.c:2161 [inline]
  __se_sys_sendmsg net/socket.c:2159 [inline]
  __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2159
  do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
  entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 7775:
  save_stack+0x45/0xd0 mm/kasan/common.c:75
  set_track mm/kasan/common.c:87 [inline]
  __kasan_slab_free+0x102/0x150 mm/kasan/common.c:460
  kasan_slab_free+0xe/0x10 mm/kasan/common.c:468
  __cache_free mm/slab.c:3488 [inline]
  kfree+0xcf/0x230 mm/slab.c:3807
  sctp_stream_outq_migrate+0x3e6/0x540 net/sctp/stream.c:88
  sctp_stream_init+0xbc/0x410 net/sctp/stream.c:139
  sctp_process_init+0x21c3/0x2b20 net/sctp/sm_make_chunk.c:2466
  sctp_cmd_process_init net/sctp/sm_sideeffect.c:682 [inline]
  sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1410 [inline]
  sctp_side_effects net/sctp/sm_sideeffect.c:1220 [inline]
  sctp_do_sm+0x3145/0x5380 net/sctp/sm_sideeffect.c:1191
  sctp_assoc_bh_rcv+0x343/0x660 net/sctp/associola.c:1074
  sctp_inq_push+0x1ea/0x290 net/sctp/inqueue.c:95
  sctp_backlog_rcv+0x196/0xbe0 net/sctp/input.c:354
  sk_backlog_rcv include/net/sock.h:936 [inline]
  __release_sock+0x12e/0x3a0 net/core/sock.c:2309
  release_sock+0x59/0x1c0 net/core/sock.c:2825
  sctp_wait_for_connect+0x316/0x540 net/sctp/socket.c:8998
  sctp_sendmsg_to_asoc+0x13e3/0x17b0 net/sctp/socket.c:1967
  sctp_sendmsg+0x81f/0x17f0 net/sctp/socket.c:2113
  inet_sendmsg+0x147/0x5d0 net/ipv4/af_inet.c:798
  sock_sendmsg_nosec net/socket.c:621 [inline]
  sock_sendmsg+0xdd/0x130 net/socket.c:631
  ___sys_sendmsg+0x806/0x930 net/socket.c:2114
  __sys_sendmsg+0x105/0x1d0 net/socket.c:2152
  __do_sys_sendmsg net/socket.c:2161 [inline]
  __se_sys_sendmsg net/socket.c:2159 [inline]
  __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2159
  do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
  entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8880a7e2c480
  which belongs to the cache kmalloc-96 of size 96
The buggy address is located 0 bytes inside of
  96-byte region [ffff8880a7e2c480, ffff8880a7e2c4e0)
The buggy address belongs to the page:
page:ffffea00029f8b00 count:1 mapcount:0 mapping:ffff88812c3f04c0  
index:0xffff8880a7e2c300
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea00029f9908 ffff88812c3f1438 ffff88812c3f04c0
raw: ffff8880a7e2c300 ffff8880a7e2c000 0000000100000012 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
  ffff8880a7e2c380: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
  ffff8880a7e2c400: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
> ffff8880a7e2c480: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
                    ^
  ffff8880a7e2c500: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
  ffff8880a7e2c580: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================


---
This bug is generated by a bot. It may contain errors.
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