[dpdk-dev] [PATCH v6 10/16] net/qede: solve broken strncpy

[Ferruh Yigit]

On 5/14/2018 6:00 AM, Andy Green wrote:
> /home/agreen/projects/dpdk/drivers/net/qede/qede_main.c: In function
> ‘qed_slowpath_start’:
> /home/agreen/projects/dpdk/drivers/net/qede/qede_main.c:307:3:
> error: ‘strncpy’ output may be truncated copying 12 bytes from a
> string of length 127 [-Werror=stringop-truncation]
>    strncpy((char *)drv_version.name, (const char *)params->name,
>    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>     MCP_DRV_VER_STR_SIZE - 4);
>     ~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> Signed-off-by: Andy Green <andy at warmcat.com>
> Fixes: 86a2265e59d7 ("qede: add SRIOV support")
> Cc: stable at dpdk.org
> ---
>  drivers/net/qede/qede_main.c |    7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/qede/qede_main.c b/drivers/net/qede/qede_main.c
> index 2333ca073..fcfc32d0d 100644
> --- a/drivers/net/qede/qede_main.c
> +++ b/drivers/net/qede/qede_main.c
> @@ -9,6 +9,7 @@
>  #include <limits.h>
>  #include <time.h>
>  #include <rte_alarm.h>
> +#include <rte_string_fns.h>
>  
>  #include "qede_ethdev.h"
>  
> @@ -303,9 +304,9 @@ static int qed_slowpath_start(struct ecore_dev *edev,
>  		drv_version.version = (params->drv_major << 24) |
>  		    (params->drv_minor << 16) |
>  		    (params->drv_rev << 8) | (params->drv_eng);
> -		/* TBD: strlcpy() */
> -		strncpy((char *)drv_version.name, (const char *)params->name,
> -			MCP_DRV_VER_STR_SIZE - 4);
> +		strlcpy((char *)drv_version.name, (const char *)params->name,
> +			sizeof(drv_version.name));
> +		drv_version.name[sizeof(drv_version.name) - 1] = '\0';

Why set '\0'? doesn't strlcpy assures it?

>  		rc = ecore_mcp_send_drv_version(hwfn, hwfn->p_main_ptt,
>  						&drv_version);
>  		if (rc) {
>