From 19afb1431bd730a1e4e09e3c0835c35572517268 Mon Sep 17 00:00:00 2001
From: Derek Su <dereksu@qnap.com>
Date: Fri, 22 May 2020 15:53:57 +0800
Subject: [PATCH 07/11] colo-compare: Fix memory leak in packet_enqueue()
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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.

Replace the error_report of full queue with a trace event.

Signed-off-by: Derek Su <dereksu@qnap.com>
Reviewed-by: Zhang Chen <chen.zhang@intel.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Zhang Chen <chen.zhang@intel.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: BiaoXiang Ye <yebiaoxiang@huawei.com>
---
 net/colo-compare.c | 23 +++++++++++++++--------
 net/trace-events   |  1 +
 2 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/net/colo-compare.c b/net/colo-compare.c
index 7ee17f2c..3168407e 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) {
+        trace_colo_compare_drop_packet(colo_mode[mode],
+            "queue size too big, drop packet");
+        packet_destroy(pkt, NULL);
+        pkt = NULL;
+    }
+
     *con = conn;
 
     return 0;
diff --git a/net/trace-events b/net/trace-events
index ac570564..a9995387 100644
--- a/net/trace-events
+++ b/net/trace-events
@@ -12,6 +12,7 @@ colo_proxy_main(const char *chr) ": %s"
 
 # colo-compare.c
 colo_compare_main(const char *chr) ": %s"
+colo_compare_drop_packet(const char *queue, const char *chr) ": %s: %s"
 colo_compare_udp_miscompare(const char *sta, int size) ": %s = %d"
 colo_compare_icmp_miscompare(const char *sta, int size) ": %s = %d"
 colo_compare_ip_info(int psize, const char *sta, const char *stb, int ssize, const char *stc, const char *std) "ppkt size = %d, ip_src = %s, ip_dst = %s, spkt size = %d, ip_src = %s, ip_dst = %s"
-- 
2.27.0.dirty