[Qemu-devel] [PATCH V2] colo-proxy: fix memory leak

[Zhang Chen <zhangchen.fnst@cn.fujitsu.com>]

Fix memory leak in colo-compare.c and filter-rewriter.c
Report by Coverity.

v2:
  - use traces instead of fprintf in colo-compare.c

v1:
  - initial patch

Signed-off-by: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>
---
 net/colo-compare.c    | 11 +++--------
 net/filter-rewriter.c | 17 +++++------------
 trace-events          |  1 +
 3 files changed, 9 insertions(+), 20 deletions(-)

diff --git a/net/colo-compare.c b/net/colo-compare.c
index 22b1da1..bbb6ca6 100644
--- a/net/colo-compare.c
+++ b/net/colo-compare.c
@@ -188,7 +188,6 @@ static int colo_packet_compare_tcp(Packet *spkt, Packet *ppkt)
 {
     struct tcphdr *ptcp, *stcp;
     int res;
-    char *sdebug, *ddebug;
 
     trace_colo_compare_main("compare tcp");
     if (ppkt->size != spkt->size) {
@@ -219,11 +218,9 @@ static int colo_packet_compare_tcp(Packet *spkt, Packet *ppkt)
                 (spkt->size - ETH_HLEN));
 
     if (res != 0 && trace_event_get_state(TRACE_COLO_COMPARE_MISCOMPARE)) {
-        sdebug = strdup(inet_ntoa(ppkt->ip->ip_src));
-        ddebug = strdup(inet_ntoa(ppkt->ip->ip_dst));
-        fprintf(stderr, "%s: src/dst: %s/%s p: seq/ack=%u/%u"
-                " s: seq/ack=%u/%u res=%d flags=%x/%x\n",
-                __func__, sdebug, ddebug,
+        trace_colo_compare_pkt_info(__func__,
+                inet_ntoa(ppkt->ip->ip_src),
+                inet_ntoa(ppkt->ip->ip_dst),
                 (unsigned int)ntohl(ptcp->th_seq),
                 (unsigned int)ntohl(ptcp->th_ack),
                 (unsigned int)ntohl(stcp->th_seq),
@@ -235,8 +232,6 @@ static int colo_packet_compare_tcp(Packet *spkt, Packet *ppkt)
         fprintf(stderr, "Secondary len = %d\n", spkt->size);
         qemu_hexdump((char *)spkt->data, stderr, "colo-compare", spkt->size);
 
-        g_free(sdebug);
-        g_free(ddebug);
     }
 
     return res;
diff --git a/net/filter-rewriter.c b/net/filter-rewriter.c
index 89abe72..c4ab91c 100644
--- a/net/filter-rewriter.c
+++ b/net/filter-rewriter.c
@@ -68,15 +68,11 @@ static int handle_primary_tcp_pkt(NetFilterState *nf,
 
     tcp_pkt = (struct tcphdr *)pkt->transport_header;
     if (trace_event_get_state(TRACE_COLO_FILTER_REWRITER_DEBUG)) {
-        char *sdebug, *ddebug;
-        sdebug = strdup(inet_ntoa(pkt->ip->ip_src));
-        ddebug = strdup(inet_ntoa(pkt->ip->ip_dst));
-        trace_colo_filter_rewriter_pkt_info(__func__, sdebug, ddebug,
+        trace_colo_filter_rewriter_pkt_info(__func__,
+                    inet_ntoa(pkt->ip->ip_src), inet_ntoa(pkt->ip->ip_dst),
                     ntohl(tcp_pkt->th_seq), ntohl(tcp_pkt->th_ack),
                     tcp_pkt->th_flags);
         trace_colo_filter_rewriter_conn_offset(conn->offset);
-        g_free(sdebug);
-        g_free(ddebug);
     }
 
     if (((tcp_pkt->th_flags & (TH_ACK | TH_SYN)) == TH_SYN)) {
@@ -116,15 +112,11 @@ static int handle_secondary_tcp_pkt(NetFilterState *nf,
     tcp_pkt = (struct tcphdr *)pkt->transport_header;
 
     if (trace_event_get_state(TRACE_COLO_FILTER_REWRITER_DEBUG)) {
-        char *sdebug, *ddebug;
-        sdebug = strdup(inet_ntoa(pkt->ip->ip_src));
-        ddebug = strdup(inet_ntoa(pkt->ip->ip_dst));
-        trace_colo_filter_rewriter_pkt_info(__func__, sdebug, ddebug,
+        trace_colo_filter_rewriter_pkt_info(__func__,
+                    inet_ntoa(pkt->ip->ip_src), inet_ntoa(pkt->ip->ip_dst),
                     ntohl(tcp_pkt->th_seq), ntohl(tcp_pkt->th_ack),
                     tcp_pkt->th_flags);
         trace_colo_filter_rewriter_conn_offset(conn->offset);
-        g_free(sdebug);
-        g_free(ddebug);
     }
 
     if (((tcp_pkt->th_flags & (TH_ACK | TH_SYN)) == (TH_ACK | TH_SYN))) {
@@ -162,6 +154,7 @@ static ssize_t colo_rewriter_receive_iov(NetFilterState *nf,
 
     iov_to_buf(iov, iovcnt, 0, buf, size);
     pkt = packet_new(buf, size);
+    g_free(buf);
 
     /*
      * if we get tcp packet
diff --git a/trace-events b/trace-events
index 1cb9d37..8115430 100644
--- a/trace-events
+++ b/trace-events
@@ -149,6 +149,7 @@ 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"
 colo_old_packet_check_found(int64_t old_time) "%" PRId64
 colo_compare_miscompare(void) ""
+colo_compare_pkt_info(const char *func, const char *src, const char *dst, uint32_t pseq, uint32_t pack, uint32_t sseq, uint32_t sack, int res, uint32_t pflag, uint32_t sflag) "%s: src/dst: %s/%s p: seq/ack=%u/%u   s: seq/ack=%u/%u res=%d flags=%x/%x\n"
 
 # net/filter-rewriter.c
 colo_filter_rewriter_debug(void) ""
-- 
2.7.4