linux-kernel - Re: [PATCH] ALSA: fix possible memory leak in snd_mixer_oss_build

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Date:	Mon, 03 Sep 2012 10:15:11 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Wei Yongjun <weiyj.lk@...il.com>
Cc:	perex@...ex.cz, yongjun_wei@...ndmicro.com.cn,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ALSA: fix possible memory leak in snd_mixer_oss_build_input()

At Sun, 2 Sep 2012 22:10:27 +0800,
Wei Yongjun wrote:
> 
> From: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>
> 
> uinfo has been allocated in this function and should be
> freed before leaving from the error handling cases.
> 
> spatch with a semantic match is used to found this problem.
> (http://coccinelle.lip6.fr/)
> 
> Signed-off-by: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>

Applied now.  Thanks.


Takashi

> ---
>  sound/core/oss/mixer_oss.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/sound/core/oss/mixer_oss.c b/sound/core/oss/mixer_oss.c
> index 18297f7..29f6ded 100644
> --- a/sound/core/oss/mixer_oss.c
> +++ b/sound/core/oss/mixer_oss.c
> @@ -1046,6 +1046,7 @@ static int snd_mixer_oss_build_input(struct snd_mixer_oss *mixer, struct snd_mix
>  			
>  		if (kctl->info(kctl, uinfo)) {
>  			up_read(&mixer->card->controls_rwsem);
> +			kfree(uinfo);
>  			return 0;
>  		}
>  		strcpy(str, ptr->name);
> @@ -1061,6 +1062,7 @@ static int snd_mixer_oss_build_input(struct snd_mixer_oss *mixer, struct snd_mix
>  				uinfo->value.enumerated.item = slot.capture_item;
>  				if (kctl->info(kctl, uinfo)) {
>  					up_read(&mixer->card->controls_rwsem);
> +					kfree(uinfo);
>  					return 0;
>  				}
>  				if (!strcmp(uinfo->value.enumerated.name, str)) {
> 
> 
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