[FFmpeg-cvslog] xwma: check bytes_per_sample, fix division by 0.

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Thu Nov 15 00:56:33 2012 +0100| [a3cb7f992f88fcfa524bd9cd08b28e09d6718f75] | committer: Michael Niedermayer

xwma: check bytes_per_sample, fix division by 0.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=a3cb7f992f88fcfa524bd9cd08b28e09d6718f75
---

 libavformat/xwma.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libavformat/xwma.c b/libavformat/xwma.c
index 04c3629..db7d971 100644
--- a/libavformat/xwma.c
+++ b/libavformat/xwma.c
@@ -200,6 +200,12 @@ 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, "bytes_per_sample is 0\n");
+            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