[FFmpeg-cvslog] xwma: Avoid division by zero

[Martin Storsjö]

ffmpeg | branch: master | Martin Storsjö <martin at martin.st> | Sat Sep 28 23:13:26 2013 +0300| [adc09136a4a63b152630abeacb22c56541eacf60] | committer: Martin Storsjö

xwma: Avoid division by zero

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable at libav.org
Signed-off-by: Martin Storsjö <martin at martin.st>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=adc09136a4a63b152630abeacb22c56541eacf60
---

 libavformat/xwma.c |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/libavformat/xwma.c b/libavformat/xwma.c
index 52e423c..f4ff815 100644
--- a/libavformat/xwma.c
+++ b/libavformat/xwma.c
@@ -198,6 +198,14 @@ static int xwma_read_header(AVFormatContext *s)
 
         /* Estimate the duration from the total number of output bytes. */
         const uint64_t total_decoded_bytes = dpds_table[dpds_table_size - 1];
+
+        if (!bytes_per_sample) {
+            av_log(s, AV_LOG_ERROR,
+                   "Invalid bits_per_coded_sample %d for %d channels\n",
+                   st->codec->bits_per_coded_sample, st->codec->channels);
+            return AVERROR_INVALIDDATA;
+        }
+
         st->duration = total_decoded_bytes / bytes_per_sample;
 
         /* Use the dpds data to build a seek table.  We can only do this after