[dpdk-dev] [dpdk-stable] [PATCH] kni: fix build with gcc 8.1

[De Lara Guarch, Pablo]

> -----Original Message-----
> From: stable [mailto:stable-bounces at dpdk.org] On Behalf Of Ferruh Yigit
> Sent: Tuesday, June 19, 2018 1:09 PM
> To: Yigit, Ferruh <ferruh.yigit at intel.com>
> Cc: dev at dpdk.org; stable at dpdk.org
> Subject: [dpdk-stable] [PATCH] kni: fix build with gcc 8.1
> 
> Error observed when CONFIG_RTE_KNI_KMOD_ETHTOOL config option is
> enabled.
> 
> build error:
> In function ‘strncpy’,
>     inlined from ‘igb_get_drvinfo’ at
>     .../dpdk/build/build/kernel/linux/kni/igb_ethtool.c:814:2:
>     .../include/linux/string.h:246:9: error: ‘__builtin_strncpy’ output
>     may be truncated copying 31 bytes from a string of length 42
>     [-Werror=stringop-truncation]
>       return __builtin_strncpy(p, q, size);
>                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> Fixed by reducing the adapter->fw_version size and adjusting strncpy limit size.
> 
> Cc: stable at dpdk.org
>

Fixes line?
 
> Signed-off-by: Ferruh Yigit <ferruh.yigit at intel.com>

...

> --- a/kernel/linux/kni/ethtool/igb/igb_ethtool.c
> +++ b/kernel/linux/kni/ethtool/igb/igb_ethtool.c
> @@ -812,7 +812,7 @@ static void igb_get_drvinfo(struct net_device *netdev,
>  	strncpy(drvinfo->version, igb_driver_version, sizeof(drvinfo->version) -
> 1);
> 
>  	strncpy(drvinfo->fw_version, adapter->fw_version,
> -		sizeof(drvinfo->fw_version) - 1);
> +		sizeof(drvinfo->fw_version));
>  	strncpy(drvinfo->bus_info, pci_name(adapter->pdev), sizeof(drvinfo-
> >bus_info) -1);

This patch fixes the compilation issue, but should we use strlcpy instead of strncpy?

Thanks,
Pablo