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

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Message-ID: <CAPgLHd8PAEMY8zan8v+DTrPpyid4Lbnr4LsNvWoZqi4r5opTaw@mail.gmail.com>
Date:	Sun, 2 Sep 2012 22:10:27 +0800
From:	Wei Yongjun <weiyj.lk@...il.com>
To:	perex@...ex.cz, tiwai@...e.de
Cc:	yongjun_wei@...ndmicro.com.cn, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] ALSA: fix possible memory leak in snd_mixer_oss_build_input()

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>
---
 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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