ALSA: xen-front: fix unsigned error check on return from to_sndif_format

The negative error return from the call to to_sndif_format is being assigned to an unsigned 8 bit integer and hence the check for a negative value is always going to be false. Fix this by using ret as the error return and hence the negative error can be detected and assign the u8 sndif_format to ret if there is no error. Detected by CoverityScan, CID#1469385 ("Unsigned compared against 0") Signed-off-by: Colin Ian King <[email protected]> Reviewed-by: Takashi Sakamoto <[email protected]> Signed-off-by: Takashi Iwai <[email protected]>
vieko · May 28, 2018 · 014cea5 · 014cea5
1 parent 3d62461
commit 014cea5
Showing 1 changed file with 4 additions and 3 deletions.
diff --git a/sound/xen/xen_snd_front_alsa.c b/sound/xen/xen_snd_front_alsa.c
@@ -466,13 +466,14 @@ static int alsa_prepare(struct snd_pcm_substream *substream)
 		u8 sndif_format;
 		int ret;
 
-		sndif_format = to_sndif_format(runtime->format);
-		if (sndif_format < 0) {
+		ret = to_sndif_format(runtime->format);
+		if (ret < 0) {
 			dev_err(&stream->front_info->xb_dev->dev,
 				"Unsupported sample format: %d\n",
 				runtime->format);
-			return sndif_format;
+			return ret;
 		}
+		sndif_format = ret;
 
 		ret = xen_snd_front_stream_prepare(&stream->evt_pair->req,
 						   &stream->sh_buf,