ALSA: allocation may fail in snd_pcm_oss_change_params()

Allocation may fail, show if it did.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
[Additional fix for invalid runtime->oss.prepare flag set by tiwai]
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 7 insertions, 2 deletions

diff --git a/sound/core/oss/pcm_oss.c b/sound/core/oss/pcm_oss.c
index dbe406b82591..d35d61b3292c 100644
--- a/sound/core/oss/pcm_oss.c
+++ b/sound/core/oss/pcm_oss.c
@@ -1043,10 +1043,15 @@ static int snd_pcm_oss_change_params(struct snd_pcm_substream *substream)
         runtime->oss.channels = params_channels(params);
         runtime->oss.rate = params_rate(params);
 
-        runtime->oss.params = 0;
-        runtime->oss.prepare = 1;
         vfree(runtime->oss.buffer);
         runtime->oss.buffer = vmalloc(runtime->oss.period_bytes);
+        if (!runtime->oss.buffer) {
+                err = -ENOMEM;
+                goto failure;
+        }
+
+        runtime->oss.params = 0;
+        runtime->oss.prepare = 1;
         runtime->oss.buffer_used = 0;
         if (runtime->dma_area)
                 snd_pcm_format_set_silence(runtime->format, runtime->dma_area, bytes_to_samples(runtime, runtime->dma_bytes));