linux-kernel - [PATCH] ALSA: asihpi - fix potential NULL pointer dereference

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Message-ID: <CAPgLHd8oUa=YMtQ1P5Qo4=M0ysqJV4L7U9RCN0W7aB+A4xLbvA@mail.gmail.com>
Date:	Tue, 12 Mar 2013 00:16:40 +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: asihpi - fix potential NULL pointer dereference

From: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>

The dereference should be moved below the NULL test.

Signed-off-by: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>
---
 sound/pci/asihpi/asihpi.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sound/pci/asihpi/asihpi.c b/sound/pci/asihpi/asihpi.c
index 3536b07..0aabfed 100644
--- a/sound/pci/asihpi/asihpi.c
+++ b/sound/pci/asihpi/asihpi.c
@@ -2549,7 +2549,7 @@ static int snd_asihpi_sampleclock_add(struct snd_card_asihpi *asihpi,
 
 static int snd_card_asihpi_mixer_new(struct snd_card_asihpi *asihpi)
 {
-	struct snd_card *card = asihpi->card;
+	struct snd_card *card;
 	unsigned int idx = 0;
 	unsigned int subindex = 0;
 	int err;
@@ -2557,6 +2557,7 @@ static int snd_card_asihpi_mixer_new(struct snd_card_asihpi *asihpi)
 
 	if (snd_BUG_ON(!asihpi))
 		return -EINVAL;
+	card = asihpi->card;
 	strcpy(card->mixername, "Asihpi Mixer");
 
 	err =


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