diff options
| author | Sage Weil <sage@inktank.com> | 2012-10-24 16:12:58 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-11-05 09:56:50 +0100 |
| commit | b6f8fbbad7bf2511aea493b0dc7be92e3b5c5a8d (patch) | |
| tree | 7ba05824c6294459d31a7e6f157e385cadd6bcb5 /net | |
| parent | a407c28651969f9e34fd51ea0415886b70e5c991 (diff) | |
libceph: avoid NULL kref_put when osd reset races with alloc_msg
commit 9bd952615a42d7e2ce3fa2c632e808e804637a1a upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ceph/messenger.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c index cad0d17ec45..3ef1759403b 100644 --- a/net/ceph/messenger.c +++ b/net/ceph/messenger.c @@ -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; |