From 5607dddbfca774fb38bffadcb077fe03aa4ac5c6 Mon Sep 17 00:00:00 2001
From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Tue, 27 Mar 2018 16:07:52 +0300
Subject: [PATCH] ALSA: pcm: potential uninitialized return values
Git-commit: 5607dddbfca774fb38bffadcb077fe03aa4ac5c6
Patch-mainline: v4.16
References: bsc#1051510

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@oracle.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

---
 sound/core/oss/pcm_oss.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/sound/core/oss/pcm_oss.c
+++ b/sound/core/oss/pcm_oss.c
@@ -1400,7 +1400,7 @@ static ssize_t snd_pcm_oss_write2(struct
 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))
@@ -1510,7 +1510,7 @@ static ssize_t snd_pcm_oss_read2(struct
 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))