From: Bruce Richardson <bruce.richardson@intel.com>
To: Keith Wiles <keith.wiles@intel.com>
Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH] net/tap: fix coverity warning on strncpy
Date: Fri, 17 Feb 2017 15:02:45 +0000 [thread overview]
Message-ID: <20170217150245.GB8652@bricha3-MOBL3.ger.corp.intel.com> (raw)
In-Reply-To: <20170217144426.47823-1-keith.wiles@intel.com>
On Fri, Feb 17, 2017 at 08:44:26AM -0600, Keith Wiles wrote:
> Calling strncpy with a maximum size argument of 16 bytes on destination
> array "ifr.ifr_ifrn.ifrn_name" of size 16 bytes might leave the
> destination string unterminated.
>
> Signed-off-by: Keith Wiles <keith.wiles@intel.com>
> ---
> drivers/net/tap/rte_eth_tap.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
> index efc4426..f9938d7 100644
> --- a/drivers/net/tap/rte_eth_tap.c
> +++ b/drivers/net/tap/rte_eth_tap.c
> @@ -297,7 +297,7 @@ tap_link_set_flags(struct pmd_internals *pmd, short flags, int add)
> return -1;
> }
> memset(&ifr, 0, sizeof(ifr));
> - strncpy(ifr.ifr_name, pmd->name, IFNAMSIZ);
> + strncpy(ifr.ifr_name, pmd->name, IFNAMSIZ-1);
This is why I always prefer to use snprintf for copying strings, you
can't avoid null terminating.
snprintf(ifr.ifr_name, IFNAMSIZ, "%s", pmd->name);
/Bruce
next prev parent reply other threads:[~2017-02-17 15:02 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-17 14:44 Keith Wiles
2017-02-17 14:48 ` Wiles, Keith
2017-02-17 15:02 ` Bruce Richardson [this message]
2017-02-17 15:05 ` Wiles, Keith
2017-02-17 15:13 ` Bruce Richardson
2017-02-17 15:15 ` Ferruh Yigit
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