Re: [Qemu-devel] [PATCH 1/4] net/slirp: fix memory leak

[Jason Wang <jasowang@redhat.com>]

On 11/20/2014 01:57 PM, arei.gonglei@huawei.com wrote:
> From: Gonglei <arei.gonglei@huawei.com>
>
> commit b412eb61 introduce 'cmd:' target for guestfwd,
> and fwd don't be used in this scenario, and will leak
> memory in true branch with 'cmd:'. Let's allocate memory
> for fwd variable just in else statement.
>
> Cc: Alexander Graf <agraf@suse.de>
> Signed-off-by: Gonglei <arei.gonglei@huawei.com>
> ---
>  net/slirp.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/net/slirp.c b/net/slirp.c
> index dc89e6b..377d7ef 100644
> --- a/net/slirp.c
> +++ b/net/slirp.c
> @@ -643,17 +643,16 @@ static int slirp_guestfwd(SlirpState *s, const char *config_str,
>          goto fail_syntax;
>      }
>  
> -    fwd = g_malloc(sizeof(struct GuestFwd));
>      snprintf(buf, sizeof(buf), "guestfwd.tcp.%d", port);
>  
>      if ((strlen(p) > 4) && !strncmp(p, "cmd:", 4)) {
>          if (slirp_add_exec(s->slirp, 0, &p[4], &server, port) < 0) {
>              error_report("conflicting/invalid host:port in guest forwarding "
>                           "rule '%s'", config_str);
> -            g_free(fwd);
>              return -1;
>          }
>      } else {
> +        fwd = g_malloc(sizeof(struct GuestFwd));
>          fwd->hd = qemu_chr_new(buf, p, NULL);
>          if (!fwd->hd) {
>              error_report("could not open guest forwarding device '%s'", buf);

Reviewed-by: Jason Wang <jasowang@redhat.com>