[dpdk-stable] [PATCH v9 3/5] net/virtio-user: fix devargs parsing

[Maxime Coquelin]

On 4/6/20 10:58 AM, Ivan Dyukov wrote:
> strtoull returns 0 if it fails to parse input string. It's ignored
> in get_integer_arg.
> 
> This patch handles error cases for strtoull function.

Fixes: ce2eabdd43ec ("net/virtio-user: add virtual device")
Cc: stable at dpdk.org

> 
> Signed-off-by: Ivan Dyukov <i.dyukov at samsung.com>
> ---
>  drivers/net/virtio/virtio_user_ethdev.c | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/virtio/virtio_user_ethdev.c b/drivers/net/virtio/virtio_user_ethdev.c
> index e61af4068..a79f68a36 100644
> --- a/drivers/net/virtio/virtio_user_ethdev.c
> +++ b/drivers/net/virtio/virtio_user_ethdev.c
> @@ -477,12 +477,17 @@ static int
>  get_integer_arg(const char *key __rte_unused,
>  		const char *value, void *extra_args)
>  {
> +	uint64_t integer = 0;
>  	if (!value || !extra_args)
>  		return -EINVAL;
> -
> -	*(uint64_t *)extra_args = strtoull(value, NULL, 0);
> -
> -	return 0;
> +	errno = 0;
> +	integer = strtoull(value, NULL, 0);
> +	/* extra_args keeps default value, it should be replaced
> +	 * only in case of successful parsing of the 'value' arg
> +	 */
> +	if (errno == 0)
> +		*(uint64_t *)extra_args = integer;
> +	return -errno;
>  }
>  
>  static struct rte_eth_dev *
> 

I will fix the commit message when applying.

Reviewed-by: Maxime Coquelin <maxime.coquelin at redhat.com>

Thanks,
Maxime