Re: [dpdk-dev] [PATCH] event/dpaa2: fix dereference before null check

[Jerin Jacob <jerinjacobk@gmail.com>]

On Wed, Aug 26, 2020 at 6:37 PM wangyunjian <wangyunjian@huawei.com> wrote:
>
> From: Yunjian Wang <wangyunjian@huawei.com>
>
> Coverity flags that 'portal' variable is used before
> it's checked for NULL. This patch fixes this issue.
>
> Coverity issue: 323516
> Fixes: 4ab57b042e7c ("event/dpaa2: affine portal at runtime during I/O")
> Cc: stable@dpdk.org


dpaa2 maintainers, Please review this.

>
> Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>
> ---
>  drivers/event/dpaa2/dpaa2_eventdev.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/event/dpaa2/dpaa2_eventdev.c b/drivers/event/dpaa2/dpaa2_eventdev.c
> index 3ae4441ee..f7383ca73 100644
> --- a/drivers/event/dpaa2/dpaa2_eventdev.c
> +++ b/drivers/event/dpaa2/dpaa2_eventdev.c
> @@ -569,14 +569,14 @@ dpaa2_eventdev_port_release(void *port)
>
>         EVENTDEV_INIT_FUNC_TRACE();
>
> +       if (portal == NULL)
> +               return;
> +
>         /* TODO: Cleanup is required when ports are in linked state. */
>         if (portal->is_port_linked)
>                 DPAA2_EVENTDEV_WARN("Event port must be unlinked before release");
>
> -       if (portal)
> -               rte_free(portal);
> -
> -       portal = NULL;
> +       rte_free(portal);
>  }
>
>  static int
> --
> 2.23.0
>
>