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libceph: avoid NULL kref_put when osd reset races with alloc_msg

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The ceph_on_in_msg_alloc() method drops con->mutex while it allocates a
message.  If that races with a timeout that resends a zillion messages and
resets the connection, and the ->alloc_msg() method returns a NULL message,
it will call ceph_msg_put(NULL) and BUG.

Fix by only calling put if msg is non-NULL.

Fixes http://tracker.newdream.net/issues/3142

Signed-off-by: Sage Weil <sage@inktank.com>
This commit is contained in:
Sage Weil 2012-10-24 16:12:58 -07:00
parent 588377d619
commit 9bd952615a
1 changed files with 2 additions and 1 deletions
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3
net/ceph/messenger.c
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@ -2750,7 +2750,8 @@ static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip)
msg = con->ops->alloc_msg(con, hdr, skip);
mutex_lock(&con->mutex);
if (con->state != CON_STATE_OPEN) {
ceph_msg_put(msg);
if (msg)
ceph_msg_put(msg);
return -EAGAIN;
}
con->in_msg = msg;