[dpdk-dev] [PATCH] pmd_virtio: Unchecked return value from library

[Basierski, SebastianX]

Hi,

Thank you for those fixes.

> -----Original Message-----
> From: Basierski, SebastianX
> Sent: Tuesday, September 19, 2017 7:47 PM
> To: skhare at vmware.com
> Cc: Basierski, SebastianX; Tan, Jianfeng; dev at dpdk.org
> Subject: [PATCH] pmd_virtio: Unchecked return value from library
> 
> Check return value from library in order to prevent potential fail.
> 
> Coverity issue: 143439
> 
> Fixes: ef53b6030039 ("net/virtio-user: support LSC")
> Cc: jianfeng.tan at intel.com
> cc: dev at dpdk.org
> 
> Signed-off-by: SebastianX Basierski <sebastianx.basierski at intel.com>
> ---
>  drivers/net/virtio/virtio_user_ethdev.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/virtio/virtio_user_ethdev.c
> b/drivers/net/virtio/virtio_user_ethdev.c
> index c961444..16aa350 100644
> --- a/drivers/net/virtio/virtio_user_ethdev.c
> +++ b/drivers/net/virtio/virtio_user_ethdev.c
> @@ -86,7 +86,10 @@ virtio_user_read_dev_config(struct virtio_hw *hw, 
> size_t offset,
>  			int flags;
> 
>  			flags = fcntl(dev->vhostfd, F_GETFL);
> -			fcntl(dev->vhostfd, F_SETFL, flags | O_NONBLOCK);
> +			if (fcntl(dev->vhostfd, F_SETFL,
> +					flags | O_NONBLOCK) == -1)
> +				return;

Actually, even it fails, I still prefer to continue instead of "return" here. Maybe, we can report an error message here.

Thanks,
Jianfeng

Hi,
I think, we should at least report an error.
Also returning after fcntl failed could save us from operating on corrupted data.

Regards,
Sebastian
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