audit: don't lose set wait time on first successful call to audit_log_start()

Copy the set wait time to a working value to avoid losing the set
value if the queue overflows.
Signed-off-by: NRichard Guy Briggs <rgb@redhat.com>
Signed-off-by: NPaul Moore <pmoore@redhat.com>

kernel/audit.c

@@ -107,6 +107,7 @@ static u32	audit_rate_limit;
  * When set to zero, this means unlimited. */
 static u32	audit_backlog_limit = 64;
 #define AUDIT_BACKLOG_WAIT_TIME (60 * HZ)
+static u32	audit_backlog_wait_time_master = AUDIT_BACKLOG_WAIT_TIME;
 static u32	audit_backlog_wait_time = AUDIT_BACKLOG_WAIT_TIME;
 static u32	audit_backlog_wait_overflow = 0;
 
@@ -338,7 +339,7 @@ static int audit_set_backlog_limit(u32 limit)
 static int audit_set_backlog_wait_time(u32 timeout)
 {
 	return audit_do_config_change("audit_backlog_wait_time",
-				      &audit_backlog_wait_time, timeout);
+				      &audit_backlog_wait_time_master, timeout);
 }
 
 static int audit_set_enabled(u32 state)
@@ -843,7 +844,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
 		s.lost			= atomic_read(&audit_lost);
 		s.backlog		= skb_queue_len(&audit_skb_queue);
 		s.feature_bitmap	= AUDIT_FEATURE_BITMAP_ALL;
-		s.backlog_wait_time	= audit_backlog_wait_time;
+		s.backlog_wait_time	= audit_backlog_wait_time_master;
 		audit_send_reply(skb, seq, AUDIT_GET, 0, 0, &s, sizeof(s));
 		break;
 	}
@@ -1394,7 +1395,7 @@ struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
 		return NULL;
 	}
 
-	audit_backlog_wait_time = AUDIT_BACKLOG_WAIT_TIME;
+	audit_backlog_wait_time = audit_backlog_wait_time_master;
 
 	ab = audit_buffer_alloc(ctx, gfp_mask, type);
 	if (!ab) {