From: Jaroslav Kysela <perex@perex.cz>
Date: Tue, 10 Apr 2001 08:26:38 +0000 (+0000)
Subject: Added the check to avoid NULL pointer dereference in snd_pcm_areas_copy
X-Git-Tag: v1.0.3~894
X-Git-Url: https://git.alsa-project.org/?a=commitdiff_plain;h=21cbbc6d0d47530d0cd68d23147f6ef45926a046;p=alsa-lib.git

Added the check to avoid NULL pointer dereference in snd_pcm_areas_copy
---

diff --git a/src/pcm/pcm_share.c b/src/pcm/pcm_share.c
index 935f57c9..c5958dd2 100644
--- a/src/pcm/pcm_share.c
+++ b/src/pcm/pcm_share.c
@@ -865,10 +865,11 @@ static int snd_pcm_share_start(snd_pcm_t *pcm)
 			snd_pcm_uframes_t cont = pcm->buffer_size - offset;
 			if (cont < frames)
 				frames = cont;
-			snd_pcm_areas_copy(pcm->running_areas, offset,
-					   pcm->stopped_areas, xfer,
-					   pcm->channels, frames,
-					   pcm->format);
+			if (pcm->stopped_areas != NULL)
+				snd_pcm_areas_copy(pcm->running_areas, offset,
+						   pcm->stopped_areas, xfer,
+						   pcm->channels, frames,
+						   pcm->format);
 			xfer += frames;
 		}
 		snd_pcm_mmap_appl_forward(pcm, hw_avail);