| From | Greg Kroah-Hartman <> | Subject | [ 157/171] libceph: verify state after retaking con lock after dispatch | Date | Wed, 21 Nov 2012 16:41:43 -0800 |
| |
3.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Sage Weil <sage@inktank.com>
(cherry picked from commit 7b862e07b1a4d5c963d19027f10ea78085f27f9b)
We drop the con mutex when delivering a message. When we retake the lock, we need to verify we are still in the OPEN state before preparing to read the next tag, or else we risk stepping on a connection that has been closed.
Signed-off-by: Sage Weil <sage@inktank.com> Reviewed-by: Alex Elder <elder@inktank.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- net/ceph/messenger.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/net/ceph/messenger.c +++ b/net/ceph/messenger.c @@ -2003,7 +2003,6 @@ static void process_message(struct ceph_ con->ops->dispatch(con, msg); mutex_lock(&con->mutex); - prepare_read_tag(con); } @@ -2213,6 +2212,8 @@ more: if (con->in_tag == CEPH_MSGR_TAG_READY) goto more; process_message(con); + if (con->state == CON_STATE_OPEN) + prepare_read_tag(con); goto more; } if (con->in_tag == CEPH_MSGR_TAG_ACK) {
|