ack_filter: fix TCP flag check

SYNs could theoretically have been filtered, which should not happen regardless of how weird the behaviour would be to trigger this case. Signed-off-by: Ryan Mounce <ryan@mounce.com.au>
dtaht · Jan 7, 2018 · 8cf5278 · 8cf5278
1 parent 31277c2
commit 8cf5278
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/sch_cake.c b/sch_cake.c
@@ -1012,7 +1012,7 @@ static struct sk_buff *cake_ack_filter(struct cake_sched_data *q,
 		 * must be 'pure' ACK, contain zero bytes of segment data
 		 * options are ignored
 		 */
-		if ((tcp_flag_word(tcph) &
+		if ((tcp_flag_word(tcph_check) &
 			(TCP_FLAG_ACK | TCP_FLAG_SYN)) != TCP_FLAG_ACK) {
 			continue;
 		} else if (((tcp_flag_word(tcph_check) &