* memory leak in sctp_stream_init_ext
@ 2019-05-31 14:58 syzbot
2019-06-04 13:36 ` Xin Long
0 siblings, 1 reply; 3+ messages in thread
From: syzbot @ 2019-05-31 14:58 UTC (permalink / raw)
To: davem, linux-kernel, linux-sctp, marcelo.leitner, netdev, nhorman,
syzkaller-bugs, vyasevich
Hello,
syzbot found the following crash on:
HEAD commit: bec7550c Merge tag 'docs-5.2-fixes2' of git://git.lwn.net/..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=152a0916a00000
kernel config: https://syzkaller.appspot.com/x/.config?x=64479170dcaf0e11
dashboard link: https://syzkaller.appspot.com/bug?extid=7f3b6b106be8dcdcdeec
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1142cd4ca00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10f81d72a00000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+7f3b6b106be8dcdcdeec@syzkaller.appspotmail.com
executing program
executing program
executing program
executing program
executing program
BUG: memory leak
unreferenced object 0xffff8881114f5d80 (size 96):
comm "syz-executor934", pid 7160, jiffies 4294993058 (age 31.950s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<00000000ce7a1326>] kmemleak_alloc_recursive
include/linux/kmemleak.h:55 [inline]
[<00000000ce7a1326>] slab_post_alloc_hook mm/slab.h:439 [inline]
[<00000000ce7a1326>] slab_alloc mm/slab.c:3326 [inline]
[<00000000ce7a1326>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
[<000000007abb7ac9>] kmalloc include/linux/slab.h:547 [inline]
[<000000007abb7ac9>] kzalloc include/linux/slab.h:742 [inline]
[<000000007abb7ac9>] sctp_stream_init_ext+0x2b/0xa0
net/sctp/stream.c:157
[<0000000048ecb9c1>] sctp_sendmsg_to_asoc+0x946/0xa00
net/sctp/socket.c:1882
[<000000004483ca2b>] sctp_sendmsg+0x2a8/0x990 net/sctp/socket.c:2102
[<0000000094bdc32e>] inet_sendmsg+0x64/0x120 net/ipv4/af_inet.c:802
[<0000000022d1c2a5>] sock_sendmsg_nosec net/socket.c:652 [inline]
[<0000000022d1c2a5>] sock_sendmsg+0x54/0x70 net/socket.c:671
[<000000006ab53119>] sock_write_iter+0xb6/0x130 net/socket.c:1000
[<00000000973772ef>] call_write_iter include/linux/fs.h:1872 [inline]
[<00000000973772ef>] new_sync_write+0x1ad/0x260 fs/read_write.c:483
[<0000000033f2491b>] __vfs_write+0x87/0xa0 fs/read_write.c:496
[<00000000372fbd56>] vfs_write fs/read_write.c:558 [inline]
[<00000000372fbd56>] vfs_write+0xee/0x210 fs/read_write.c:542
[<000000007ccb2ea5>] ksys_write+0x7c/0x130 fs/read_write.c:611
[<000000001c29b8c7>] __do_sys_write fs/read_write.c:623 [inline]
[<000000001c29b8c7>] __se_sys_write fs/read_write.c:620 [inline]
[<000000001c29b8c7>] __x64_sys_write+0x1e/0x30 fs/read_write.c:620
[<0000000014d9243b>] do_syscall_64+0x76/0x1a0
arch/x86/entry/common.c:301
[<0000000059f6e9a8>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
BUG: memory leak
unreferenced object 0xffff8881114f5d80 (size 96):
comm "syz-executor934", pid 7160, jiffies 4294993058 (age 33.160s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<00000000ce7a1326>] kmemleak_alloc_recursive
include/linux/kmemleak.h:55 [inline]
[<00000000ce7a1326>] slab_post_alloc_hook mm/slab.h:439 [inline]
[<00000000ce7a1326>] slab_alloc mm/slab.c:3326 [inline]
[<00000000ce7a1326>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
[<000000007abb7ac9>] kmalloc include/linux/slab.h:547 [inline]
[<000000007abb7ac9>] kzalloc include/linux/slab.h:742 [inline]
[<000000007abb7ac9>] sctp_stream_init_ext+0x2b/0xa0
net/sctp/stream.c:157
[<0000000048ecb9c1>] sctp_sendmsg_to_asoc+0x946/0xa00
net/sctp/socket.c:1882
[<000000004483ca2b>] sctp_sendmsg+0x2a8/0x990 net/sctp/socket.c:2102
[<0000000094bdc32e>] inet_sendmsg+0x64/0x120 net/ipv4/af_inet.c:802
[<0000000022d1c2a5>] sock_sendmsg_nosec net/socket.c:652 [inline]
[<0000000022d1c2a5>] sock_sendmsg+0x54/0x70 net/socket.c:671
[<000000006ab53119>] sock_write_iter+0xb6/0x130 net/socket.c:1000
[<00000000973772ef>] call_write_iter include/linux/fs.h:1872 [inline]
[<00000000973772ef>] new_sync_write+0x1ad/0x260 fs/read_write.c:483
[<0000000033f2491b>] __vfs_write+0x87/0xa0 fs/read_write.c:496
[<00000000372fbd56>] vfs_write fs/read_write.c:558 [inline]
[<00000000372fbd56>] vfs_write+0xee/0x210 fs/read_write.c:542
[<000000007ccb2ea5>] ksys_write+0x7c/0x130 fs/read_write.c:611
[<000000001c29b8c7>] __do_sys_write fs/read_write.c:623 [inline]
[<000000001c29b8c7>] __se_sys_write fs/read_write.c:620 [inline]
[<000000001c29b8c7>] __x64_sys_write+0x1e/0x30 fs/read_write.c:620
[<0000000014d9243b>] do_syscall_64+0x76/0x1a0
arch/x86/entry/common.c:301
[<0000000059f6e9a8>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
executing program
executing program
executing program
executing program
executing program
executing program
---
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.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: memory leak in sctp_stream_init_ext
2019-05-31 14:58 memory leak in sctp_stream_init_ext syzbot
@ 2019-06-04 13:36 ` Xin Long
2019-06-04 13:38 ` Dmitry Vyukov
0 siblings, 1 reply; 3+ messages in thread
From: Xin Long @ 2019-06-04 13:36 UTC (permalink / raw)
To: syzbot
Cc: davem, LKML, linux-sctp, Marcelo Ricardo Leitner, network dev,
Neil Horman, syzkaller-bugs, Vlad Yasevich
On Fri, May 31, 2019 at 10:59 PM syzbot
<syzbot+7f3b6b106be8dcdcdeec@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: bec7550c Merge tag 'docs-5.2-fixes2' of git://git.lwn.net/..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=152a0916a00000
> kernel config: https://syzkaller.appspot.com/x/.config?x=64479170dcaf0e11
> dashboard link: https://syzkaller.appspot.com/bug?extid=7f3b6b106be8dcdcdeec
> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1142cd4ca00000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10f81d72a00000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+7f3b6b106be8dcdcdeec@syzkaller.appspotmail.com
>
> executing program
> executing program
> executing program
> executing program
> executing program
> BUG: memory leak
> unreferenced object 0xffff8881114f5d80 (size 96):
> comm "syz-executor934", pid 7160, jiffies 4294993058 (age 31.950s)
> hex dump (first 32 bytes):
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> backtrace:
> [<00000000ce7a1326>] kmemleak_alloc_recursive
> include/linux/kmemleak.h:55 [inline]
> [<00000000ce7a1326>] slab_post_alloc_hook mm/slab.h:439 [inline]
> [<00000000ce7a1326>] slab_alloc mm/slab.c:3326 [inline]
> [<00000000ce7a1326>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
> [<000000007abb7ac9>] kmalloc include/linux/slab.h:547 [inline]
> [<000000007abb7ac9>] kzalloc include/linux/slab.h:742 [inline]
> [<000000007abb7ac9>] sctp_stream_init_ext+0x2b/0xa0
> net/sctp/stream.c:157
> [<0000000048ecb9c1>] sctp_sendmsg_to_asoc+0x946/0xa00
> net/sctp/socket.c:1882
is this possible to be a false positive?
As in my testing, I tracked the objects allocated by
"sctp_sendmsg_to_asoc () -> sctp_stream_init_ext()."
all of them got freed properly in sctp_stream_free(),
while this warning was still triggered.
> [<000000004483ca2b>] sctp_sendmsg+0x2a8/0x990 net/sctp/socket.c:2102
> [<0000000094bdc32e>] inet_sendmsg+0x64/0x120 net/ipv4/af_inet.c:802
> [<0000000022d1c2a5>] sock_sendmsg_nosec net/socket.c:652 [inline]
> [<0000000022d1c2a5>] sock_sendmsg+0x54/0x70 net/socket.c:671
> [<000000006ab53119>] sock_write_iter+0xb6/0x130 net/socket.c:1000
> [<00000000973772ef>] call_write_iter include/linux/fs.h:1872 [inline]
> [<00000000973772ef>] new_sync_write+0x1ad/0x260 fs/read_write.c:483
> [<0000000033f2491b>] __vfs_write+0x87/0xa0 fs/read_write.c:496
> [<00000000372fbd56>] vfs_write fs/read_write.c:558 [inline]
> [<00000000372fbd56>] vfs_write+0xee/0x210 fs/read_write.c:542
> [<000000007ccb2ea5>] ksys_write+0x7c/0x130 fs/read_write.c:611
> [<000000001c29b8c7>] __do_sys_write fs/read_write.c:623 [inline]
> [<000000001c29b8c7>] __se_sys_write fs/read_write.c:620 [inline]
> [<000000001c29b8c7>] __x64_sys_write+0x1e/0x30 fs/read_write.c:620
> [<0000000014d9243b>] do_syscall_64+0x76/0x1a0
> arch/x86/entry/common.c:301
> [<0000000059f6e9a8>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> BUG: memory leak
> unreferenced object 0xffff8881114f5d80 (size 96):
> comm "syz-executor934", pid 7160, jiffies 4294993058 (age 33.160s)
> hex dump (first 32 bytes):
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> backtrace:
> [<00000000ce7a1326>] kmemleak_alloc_recursive
> include/linux/kmemleak.h:55 [inline]
> [<00000000ce7a1326>] slab_post_alloc_hook mm/slab.h:439 [inline]
> [<00000000ce7a1326>] slab_alloc mm/slab.c:3326 [inline]
> [<00000000ce7a1326>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
> [<000000007abb7ac9>] kmalloc include/linux/slab.h:547 [inline]
> [<000000007abb7ac9>] kzalloc include/linux/slab.h:742 [inline]
> [<000000007abb7ac9>] sctp_stream_init_ext+0x2b/0xa0
> net/sctp/stream.c:157
> [<0000000048ecb9c1>] sctp_sendmsg_to_asoc+0x946/0xa00
> net/sctp/socket.c:1882
> [<000000004483ca2b>] sctp_sendmsg+0x2a8/0x990 net/sctp/socket.c:2102
> [<0000000094bdc32e>] inet_sendmsg+0x64/0x120 net/ipv4/af_inet.c:802
> [<0000000022d1c2a5>] sock_sendmsg_nosec net/socket.c:652 [inline]
> [<0000000022d1c2a5>] sock_sendmsg+0x54/0x70 net/socket.c:671
> [<000000006ab53119>] sock_write_iter+0xb6/0x130 net/socket.c:1000
> [<00000000973772ef>] call_write_iter include/linux/fs.h:1872 [inline]
> [<00000000973772ef>] new_sync_write+0x1ad/0x260 fs/read_write.c:483
> [<0000000033f2491b>] __vfs_write+0x87/0xa0 fs/read_write.c:496
> [<00000000372fbd56>] vfs_write fs/read_write.c:558 [inline]
> [<00000000372fbd56>] vfs_write+0xee/0x210 fs/read_write.c:542
> [<000000007ccb2ea5>] ksys_write+0x7c/0x130 fs/read_write.c:611
> [<000000001c29b8c7>] __do_sys_write fs/read_write.c:623 [inline]
> [<000000001c29b8c7>] __se_sys_write fs/read_write.c:620 [inline]
> [<000000001c29b8c7>] __x64_sys_write+0x1e/0x30 fs/read_write.c:620
> [<0000000014d9243b>] do_syscall_64+0x76/0x1a0
> arch/x86/entry/common.c:301
> [<0000000059f6e9a8>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> executing program
> executing program
> executing program
> executing program
> executing program
> executing program
>
>
> ---
> 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.
> syzbot can test patches for this bug, for details see:
> https://goo.gl/tpsmEJ#testing-patches
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: memory leak in sctp_stream_init_ext
2019-06-04 13:36 ` Xin Long
@ 2019-06-04 13:38 ` Dmitry Vyukov
0 siblings, 0 replies; 3+ messages in thread
From: Dmitry Vyukov @ 2019-06-04 13:38 UTC (permalink / raw)
To: Xin Long
Cc: syzbot, davem, LKML, linux-sctp, Marcelo Ricardo Leitner,
network dev, Neil Horman, syzkaller-bugs, Vlad Yasevich
On Tue, Jun 4, 2019 at 3:37 PM Xin Long <lucien.xin@gmail.com> wrote:
>
> On Fri, May 31, 2019 at 10:59 PM syzbot
> <syzbot+7f3b6b106be8dcdcdeec@syzkaller.appspotmail.com> wrote:
> >
> > Hello,
> >
> > syzbot found the following crash on:
> >
> > HEAD commit: bec7550c Merge tag 'docs-5.2-fixes2' of git://git.lwn.net/..
> > git tree: upstream
> > console output: https://syzkaller.appspot.com/x/log.txt?x=152a0916a00000
> > kernel config: https://syzkaller.appspot.com/x/.config?x=64479170dcaf0e11
> > dashboard link: https://syzkaller.appspot.com/bug?extid=7f3b6b106be8dcdcdeec
> > compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1142cd4ca00000
> > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10f81d72a00000
> >
> > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > Reported-by: syzbot+7f3b6b106be8dcdcdeec@syzkaller.appspotmail.com
> >
> > executing program
> > executing program
> > executing program
> > executing program
> > executing program
> > BUG: memory leak
> > unreferenced object 0xffff8881114f5d80 (size 96):
> > comm "syz-executor934", pid 7160, jiffies 4294993058 (age 31.950s)
> > hex dump (first 32 bytes):
> > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> > backtrace:
> > [<00000000ce7a1326>] kmemleak_alloc_recursive
> > include/linux/kmemleak.h:55 [inline]
> > [<00000000ce7a1326>] slab_post_alloc_hook mm/slab.h:439 [inline]
> > [<00000000ce7a1326>] slab_alloc mm/slab.c:3326 [inline]
> > [<00000000ce7a1326>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
> > [<000000007abb7ac9>] kmalloc include/linux/slab.h:547 [inline]
> > [<000000007abb7ac9>] kzalloc include/linux/slab.h:742 [inline]
> > [<000000007abb7ac9>] sctp_stream_init_ext+0x2b/0xa0
> > net/sctp/stream.c:157
> > [<0000000048ecb9c1>] sctp_sendmsg_to_asoc+0x946/0xa00
> > net/sctp/socket.c:1882
>
> is this possible to be a false positive?
https://goo.gl/tpsmEJ#memory-leaks
> As in my testing, I tracked the objects allocated by
> "sctp_sendmsg_to_asoc () -> sctp_stream_init_ext()."
> all of them got freed properly in sctp_stream_free(),
> while this warning was still triggered.
>
> > [<000000004483ca2b>] sctp_sendmsg+0x2a8/0x990 net/sctp/socket.c:2102
> > [<0000000094bdc32e>] inet_sendmsg+0x64/0x120 net/ipv4/af_inet.c:802
> > [<0000000022d1c2a5>] sock_sendmsg_nosec net/socket.c:652 [inline]
> > [<0000000022d1c2a5>] sock_sendmsg+0x54/0x70 net/socket.c:671
> > [<000000006ab53119>] sock_write_iter+0xb6/0x130 net/socket.c:1000
> > [<00000000973772ef>] call_write_iter include/linux/fs.h:1872 [inline]
> > [<00000000973772ef>] new_sync_write+0x1ad/0x260 fs/read_write.c:483
> > [<0000000033f2491b>] __vfs_write+0x87/0xa0 fs/read_write.c:496
> > [<00000000372fbd56>] vfs_write fs/read_write.c:558 [inline]
> > [<00000000372fbd56>] vfs_write+0xee/0x210 fs/read_write.c:542
> > [<000000007ccb2ea5>] ksys_write+0x7c/0x130 fs/read_write.c:611
> > [<000000001c29b8c7>] __do_sys_write fs/read_write.c:623 [inline]
> > [<000000001c29b8c7>] __se_sys_write fs/read_write.c:620 [inline]
> > [<000000001c29b8c7>] __x64_sys_write+0x1e/0x30 fs/read_write.c:620
> > [<0000000014d9243b>] do_syscall_64+0x76/0x1a0
> > arch/x86/entry/common.c:301
> > [<0000000059f6e9a8>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
> >
> > BUG: memory leak
> > unreferenced object 0xffff8881114f5d80 (size 96):
> > comm "syz-executor934", pid 7160, jiffies 4294993058 (age 33.160s)
> > hex dump (first 32 bytes):
> > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> > backtrace:
> > [<00000000ce7a1326>] kmemleak_alloc_recursive
> > include/linux/kmemleak.h:55 [inline]
> > [<00000000ce7a1326>] slab_post_alloc_hook mm/slab.h:439 [inline]
> > [<00000000ce7a1326>] slab_alloc mm/slab.c:3326 [inline]
> > [<00000000ce7a1326>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
> > [<000000007abb7ac9>] kmalloc include/linux/slab.h:547 [inline]
> > [<000000007abb7ac9>] kzalloc include/linux/slab.h:742 [inline]
> > [<000000007abb7ac9>] sctp_stream_init_ext+0x2b/0xa0
> > net/sctp/stream.c:157
> > [<0000000048ecb9c1>] sctp_sendmsg_to_asoc+0x946/0xa00
> > net/sctp/socket.c:1882
> > [<000000004483ca2b>] sctp_sendmsg+0x2a8/0x990 net/sctp/socket.c:2102
> > [<0000000094bdc32e>] inet_sendmsg+0x64/0x120 net/ipv4/af_inet.c:802
> > [<0000000022d1c2a5>] sock_sendmsg_nosec net/socket.c:652 [inline]
> > [<0000000022d1c2a5>] sock_sendmsg+0x54/0x70 net/socket.c:671
> > [<000000006ab53119>] sock_write_iter+0xb6/0x130 net/socket.c:1000
> > [<00000000973772ef>] call_write_iter include/linux/fs.h:1872 [inline]
> > [<00000000973772ef>] new_sync_write+0x1ad/0x260 fs/read_write.c:483
> > [<0000000033f2491b>] __vfs_write+0x87/0xa0 fs/read_write.c:496
> > [<00000000372fbd56>] vfs_write fs/read_write.c:558 [inline]
> > [<00000000372fbd56>] vfs_write+0xee/0x210 fs/read_write.c:542
> > [<000000007ccb2ea5>] ksys_write+0x7c/0x130 fs/read_write.c:611
> > [<000000001c29b8c7>] __do_sys_write fs/read_write.c:623 [inline]
> > [<000000001c29b8c7>] __se_sys_write fs/read_write.c:620 [inline]
> > [<000000001c29b8c7>] __x64_sys_write+0x1e/0x30 fs/read_write.c:620
> > [<0000000014d9243b>] do_syscall_64+0x76/0x1a0
> > arch/x86/entry/common.c:301
> > [<0000000059f6e9a8>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
> >
> > executing program
> > executing program
> > executing program
> > executing program
> > executing program
> > executing program
> >
> >
> > ---
> > 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.
> > syzbot can test patches for this bug, for details see:
> > https://goo.gl/tpsmEJ#testing-patches
>
> --
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> To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@googlegroups.com.
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> For more options, visit https://groups.google.com/d/optout.
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2019-05-31 14:58 memory leak in sctp_stream_init_ext syzbot
2019-06-04 13:36 ` Xin Long
2019-06-04 13:38 ` Dmitry Vyukov
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