[PATCH v4 1/2] net/colo-compare.c: Fix memory leak in packet_enqueue()

[Derek Su <dereksu@qnap.com>]

The patch is to fix the "pkt" memory leak in packet_enqueue().
The allocated "pkt" needs to be freed if the colo compare
primary or secondary queue is too big.

Signed-off-by: Derek Su <dereksu@qnap.com>
---
 net/colo-compare.c | 23 +++++++++++++++--------
 1 file changed, 15 insertions(+), 8 deletions(-)

diff --git a/net/colo-compare.c b/net/colo-compare.c
index 7ee17f2cf8..cdd87b2aa8 100644
--- a/net/colo-compare.c
+++ b/net/colo-compare.c
@@ -120,6 +120,10 @@ enum {
     SECONDARY_IN,
 };
 
+static const char *colo_mode[] = {
+    [PRIMARY_IN] = "primary",
+    [SECONDARY_IN] = "secondary",
+};
 
 static int compare_chr_send(CompareState *s,
                             const uint8_t *buf,
@@ -215,6 +219,7 @@ static int packet_enqueue(CompareState *s, int mode, Connection **con)
     ConnectionKey key;
     Packet *pkt = NULL;
     Connection *conn;
+    int ret;
 
     if (mode == PRIMARY_IN) {
         pkt = packet_new(s->pri_rs.buf,
@@ -243,16 +248,18 @@ static int packet_enqueue(CompareState *s, int mode, Connection **con)
     }
 
     if (mode == PRIMARY_IN) {
-        if (!colo_insert_packet(&conn->primary_list, pkt, &conn->pack)) {
-            error_report("colo compare primary queue size too big,"
-                         "drop packet");
-        }
+        ret = colo_insert_packet(&conn->primary_list, pkt, &conn->pack);
     } else {
-        if (!colo_insert_packet(&conn->secondary_list, pkt, &conn->sack)) {
-            error_report("colo compare secondary queue size too big,"
-                         "drop packet");
-        }
+        ret = colo_insert_packet(&conn->secondary_list, pkt, &conn->sack);
     }
+
+    if (!ret) {
+        error_report("colo compare %s queue size too big,"
+                     "drop packet", colo_mode[mode]);
+        packet_destroy(pkt, NULL);
+        pkt = NULL;
+    }
+
     *con = conn;
 
     return 0;
-- 
2.17.1