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

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

> -----Original Message-----
> From: Derek Su <dereksu@qnap.com>
> Sent: Saturday, March 28, 2020 8:47 PM
> 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 v4 1/2] net/colo-compare.c: 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.
> 
> Signed-off-by: Derek Su <dereksu@qnap.com>

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