dlm: verify that places expecting rcom_lock have packet long enough
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David Teigland <teigland@redhat.com>
diff --git a/fs/dlm/rcom.c b/fs/dlm/rcom.c
index a312f1d..ef9d0f9 100644
--- a/fs/dlm/rcom.c
+++ b/fs/dlm/rcom.c
@@ -357,6 +357,7 @@
return error;
}
+/* needs at least dlm_rcom + rcom_lock */
static void receive_rcom_lock(struct dlm_ls *ls, struct dlm_rcom *rc_in)
{
struct dlm_rcom *rc;
@@ -448,6 +449,8 @@
void dlm_receive_rcom(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid)
{
+ int lock_size = sizeof(struct dlm_rcom) + sizeof(struct rcom_lock);
+
if (dlm_recovery_stopped(ls) && (rc->rc_type != DLM_RCOM_STATUS)) {
log_debug(ls, "ignoring recovery message %x from %d",
rc->rc_type, nodeid);
@@ -471,6 +474,8 @@
break;
case DLM_RCOM_LOCK:
+ if (rc->rc_header.h_length < lock_size)
+ goto Eshort;
receive_rcom_lock(ls, rc);
break;
@@ -487,13 +492,18 @@
break;
case DLM_RCOM_LOCK_REPLY:
+ if (rc->rc_header.h_length < lock_size)
+ goto Eshort;
dlm_recover_process_copy(ls, rc);
break;
default:
log_error(ls, "receive_rcom bad type %d", rc->rc_type);
}
- out:
+out:
return;
+Eshort:
+ log_error(ls, "recovery message %x from %d is too short",
+ rc->rc_type, nodeid);
}