linux-kernel - Re: [PATCH V2] net: ethernet: myricom: myri10ge: myri10ge.c: Cleaning up missing null-terminate after strncpy call

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Date:	Sat, 16 Aug 2014 23:18:54 +0200
From:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
To:	Jiri Pirko <jiri@...nulli.us>
Cc:	Hyong-Youb Kim <hykim@...i.com>,
	Network Development <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2] net: ethernet: myricom: myri10ge: myri10ge.c: Cleaning
 up missing null-terminate after strncpy call

2014-08-13 19:06 GMT+02:00 Jiri Pirko <jiri@...nulli.us>:
> Mon, Aug 11, 2014 at 09:18:16PM CEST, rickard_strandqvist@...ctrumdigital.se wrote:
>>Added a guaranteed null-terminate after call to strncpy.
>>
>>Signed-off-by: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
>>---
>> drivers/net/ethernet/myricom/myri10ge/myri10ge.c |    1 +
>> 1 file changed, 1 insertion(+)
>>
>>diff --git a/drivers/net/ethernet/myricom/myri10ge/myri10ge.c b/drivers/net/ethernet/myricom/myri10ge/myri10ge.c
>>index f3d5d79..69c26f0 100644
>>--- a/drivers/net/ethernet/myricom/myri10ge/myri10ge.c
>>+++ b/drivers/net/ethernet/myricom/myri10ge/myri10ge.c
>>@@ -574,6 +574,7 @@ myri10ge_validate_firmware(struct myri10ge_priv *mgp,
>>
>>       /* save firmware version for ethtool */
>>       strncpy(mgp->fw_version, hdr->version, sizeof(mgp->fw_version));
>>+      mgp->fw_version[sizeof(mgp->fw_version) - 1] = '\0';
>
>         Why not to use strlcpy?
>
>>
>>       sscanf(mgp->fw_version, "%d.%d.%d", &mgp->fw_ver_major,
>>              &mgp->fw_ver_minor, &mgp->fw_ver_tiny);
>>--
>>1.7.10.4


Hi

Sure, strlcpy is preferable in many ways if we only can guarantee that
it is safe.
I have seldom received so much criticism when I start switching to
strlcpy, although much of it was justified :)
Even Linus was getting into the debate.  See more:

https://plus.google.com/111049168280159033135/posts/1amLbuhWbh5


I change to strlcpy only when I'm sure it will not cause any other problems.
But if you or anyone else can guarantee that in this case, so I'd make
a new patch with strlcpy.


Kind regards

Rickard Strandqvist
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