diff options
| author | Guoqing Jiang <gqjiang@suse.com> | 2017-08-07 09:31:20 +0300 |
|---|---|---|
| committer | David Teigland <teigland@redhat.com> | 2017-08-07 19:23:09 +0300 |
| commit | 1c24285372412b26af4f0f980c115e857fb87c02 (patch) | |
| tree | aa41623be3f5b04b2637e0fbe1af39387036301b | |
| parent | f02a60924c221985fb8b634734d6610706fa779a (diff) | |
| download | linux-1c24285372412b26af4f0f980c115e857fb87c02.tar.xz | |
dlm: use sock_create_lite inside tcp_accept_from_sock
With commit 0ffdaf5b41cf ("net/sock: add WARN_ON(parent->sk)
in sock_graft()"), a calltrace happened as follows:
[ 457.018340] WARNING: CPU: 0 PID: 15623 at ./include/net/sock.h:1703 inet_accept+0x135/0x140
...
[ 457.018381] RIP: 0010:inet_accept+0x135/0x140
[ 457.018381] RSP: 0018:ffffc90001727d18 EFLAGS: 00010286
[ 457.018383] RAX: 0000000000000001 RBX: ffff880012413000 RCX: 0000000000000001
[ 457.018384] RDX: 000000000000018a RSI: 00000000fffffe01 RDI: ffffffff8156fae8
[ 457.018384] RBP: ffffc90001727d38 R08: 0000000000000000 R09: 0000000000004305
[ 457.018385] R10: 0000000000000001 R11: 0000000000004304 R12: ffff880035ae7a00
[ 457.018386] R13: ffff88001282af10 R14: ffff880034e4e200 R15: 0000000000000000
[ 457.018387] FS: 0000000000000000(0000) GS:ffff88003fc00000(0000) knlGS:0000000000000000
[ 457.018388] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 457.018389] CR2: 00007fdec22f9000 CR3: 0000000002b5a000 CR4: 00000000000006f0
[ 457.018395] Call Trace:
[ 457.018402] tcp_accept_from_sock.part.8+0x12d/0x449 [dlm]
[ 457.018405] ? vprintk_emit+0x248/0x2d0
[ 457.018409] tcp_accept_from_sock+0x3f/0x50 [dlm]
[ 457.018413] process_recv_sockets+0x3b/0x50 [dlm]
[ 457.018415] process_one_work+0x138/0x370
[ 457.018417] worker_thread+0x4d/0x3b0
[ 457.018419] kthread+0x109/0x140
[ 457.018421] ? rescuer_thread+0x320/0x320
[ 457.018422] ? kthread_park+0x60/0x60
[ 457.018424] ret_from_fork+0x25/0x30
Since newsocket created by sock_create_kern sets it's
sock by the path:
sock_create_kern -> __sock_creat
->pf->create => inet_create
-> sock_init_data
Then WARN_ON is triggered by "con->sock->ops->accept =>
inet_accept -> sock_graft", it also means newsock->sk
is leaked since sock_graft will replace it with a new
sk.
To resolve the issue, we need to use sock_create_lite
instead of sock_create_kern, like commit 0933a578cd55
("rds: tcp: use sock_create_lite() to create the accept
socket") did.
Reported-by: Zhilong Liu <zlliu@suse.com>
Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: David Teigland <teigland@redhat.com>
| -rw-r--r-- | fs/dlm/lowcomms.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c index 9382db998ec9..4813d0e0cd9b 100644 --- a/fs/dlm/lowcomms.c +++ b/fs/dlm/lowcomms.c @@ -729,7 +729,7 @@ static int tcp_accept_from_sock(struct connection *con) mutex_unlock(&connections_lock); memset(&peeraddr, 0, sizeof(peeraddr)); - result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, + result = sock_create_lite(dlm_local_addr[0]->ss_family, SOCK_STREAM, IPPROTO_TCP, &newsock); if (result < 0) return -ENOMEM; |