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

[Lukas Straub <lukasstraub2@web.de>]

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On Fri, 10 Apr 2020 10:00:56 +0800
Derek Su <dereksu@qnap.com> wrote:

> 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>

Looks good now and works well in my tests.
Reviewed-by: Lukas Straub <lukasstraub2@web.de>
Tested-by: Lukas Straub <lukasstraub2@web.de>

Regards,
Lukas Straub

> ---
>  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"


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