linux-kernel - Re: [PATCH] sound, core, pcm_lib: remember to always call va_end() on stuff that we va

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Date:	Tue, 21 Dec 2010 08:04:59 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Jesper Juhl <jj@...osbits.net>
Cc:	Jaroslav Kysela <perex@...ex.cz>,
	Krzysztof Helt <krzysztof.h1@...pl>,
	Clemens Ladisch <clemens@...isch.de>,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sound, core, pcm_lib: remember to always call va_end() on stuff that we va_start()

At Tue, 21 Dec 2010 00:03:17 +0100 (CET),
Jesper Juhl wrote:
> 
> Hi,
> 
> The Coverity checker spotted that we do not always remember to call 
> va_end() on 'args' in failure paths in snd_pcm_hw_rule_add().
> Here's a patch to fix that up (compile tested only) - it also removes 
> some annoying trailing whitespace that caught my eye while I was in the 
> area..
> 
> Signed-off-by: Jesper Juhl <jj@...osbits.net>

Thanks, applied now.


Takashi

> ---
>  pcm_lib.c |   10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
> index b75db8e..11446a1 100644
> --- a/sound/core/pcm_lib.c
> +++ b/sound/core/pcm_lib.c
> @@ -1070,8 +1070,10 @@ int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
>  		struct snd_pcm_hw_rule *new;
>  		unsigned int new_rules = constrs->rules_all + 16;
>  		new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
> -		if (!new)
> +		if (!new) {
> +			va_end(args);
>  			return -ENOMEM;
> +		}
>  		if (constrs->rules) {
>  			memcpy(new, constrs->rules,
>  			       constrs->rules_num * sizeof(*c));
> @@ -1087,8 +1089,10 @@ int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
>  	c->private = private;
>  	k = 0;
>  	while (1) {
> -		if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps)))
> +		if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps))) {
> +			va_end(args);
>  			return -EINVAL;
> +		}
>  		c->deps[k++] = dep;
>  		if (dep < 0)
>  			break;
> @@ -1097,7 +1101,7 @@ int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
>  	constrs->rules_num++;
>  	va_end(args);
>  	return 0;
> -}				    
> +}
>  
>  EXPORT_SYMBOL(snd_pcm_hw_rule_add);
>  
> 
> 
> -- 
> Jesper Juhl <jj@...osbits.net>            http://www.chaosbits.net/
> Don't top-post http://www.catb.org/~esr/jargon/html/T/top-post.html
> Plain text mails only, please.
> 
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