RE: [PATCH v5 1/1] colo-compare: Fix memory leak in packet_enqueue()

["Zhang, Chen" <chen.zhang@intel.com>]

> -----Original Message-----
> From: Derek Su <dereksu@qnap.com>
> Sent: Friday, April 10, 2020 10:01 AM
> To: qemu-devel@nongnu.org
> Cc: Zhang, Chen <chen.zhang@intel.com>; lizhijian@cn.fujitsu.com;
> jasowang@redhat.com; ctcheng@qnap.com; chyang@qnap.com;
> jwsu1986@gmail.com; Derek Su <dereksu@qnap.com>
> Subject: [PATCH v5 1/1] colo-compare: Fix memory leak in packet_enqueue()
> 
> 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.
> 

Looks good for me. Thanks your contribution.

Reviewed-by: Zhang Chen <chen.zhang@intel.com>

Thanks
Zhang Chen

> Signed-off-by: Derek Su <dereksu@qnap.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
> 10c0239f9d..035e11d4d3 100644
> --- a/net/colo-compare.c
> +++ b/net/colo-compare.c
> @@ -122,6 +122,10 @@ 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, @@ -217,6 +221,7 @@ 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, @@ -245,16 +250,18 @@ 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
> 02c13fd0ba..fa49c71533 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"
> --
> 2.17.1