linux-kernel - [PATCH] ALSA: pcm: potential uninitialized return values

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Date:   Tue, 27 Mar 2018 16:07:52 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Takashi Iwai <tiwai@...e.com>
Cc:     Jaroslav Kysela <perex@...ex.cz>,
        Takashi Sakamoto <o-takashi@...amocchi.jp>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] ALSA: pcm: potential uninitialized return values

Smatch complains that "tmp" can be uninitialized if we do a zero size
write.

Fixes: 02a5d6925cd3 ("ALSA: pcm: Avoid potential races between OSS ioctls and read/write")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/sound/core/oss/pcm_oss.c b/sound/core/oss/pcm_oss.c
index a9082f219561..40852c595453 100644
--- a/sound/core/oss/pcm_oss.c
+++ b/sound/core/oss/pcm_oss.c
@@ -1364,7 +1364,7 @@ static ssize_t snd_pcm_oss_write2(struct snd_pcm_substream *substream, const cha
 static ssize_t snd_pcm_oss_write1(struct snd_pcm_substream *substream, const char __user *buf, size_t bytes)
 {
 	size_t xfer = 0;
-	ssize_t tmp;
+	ssize_t tmp = 0;
 	struct snd_pcm_runtime *runtime = substream->runtime;
 
 	if (atomic_read(&substream->mmap_count))
@@ -1474,7 +1474,7 @@ static ssize_t snd_pcm_oss_read2(struct snd_pcm_substream *substream, char *buf,
 static ssize_t snd_pcm_oss_read1(struct snd_pcm_substream *substream, char __user *buf, size_t bytes)
 {
 	size_t xfer = 0;
-	ssize_t tmp;
+	ssize_t tmp = 0;
 	struct snd_pcm_runtime *runtime = substream->runtime;
 
 	if (atomic_read(&substream->mmap_count))