[FFmpeg-cvslog] diracdec: fix empty data units.

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Mon Nov 14 18:01:13 2011 +0100| [6718536ba500d8a471bae3849f124da892936c70] | committer: Michael Niedermayer

diracdec: fix empty data units.
Fixed Ticket636

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=6718536ba500d8a471bae3849f124da892936c70
---

 libavcodec/diracdec.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/libavcodec/diracdec.c b/libavcodec/diracdec.c
index db2cb0f..1ace7bd 100644
--- a/libavcodec/diracdec.c
+++ b/libavcodec/diracdec.c
@@ -1836,7 +1836,8 @@ static int dirac_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
             break;
 
         data_unit_size = AV_RB32(buf+buf_idx+5);
-        if (buf_idx + data_unit_size > buf_size) {
+        if (buf_idx + data_unit_size > buf_size || !data_unit_size) {
+            if(buf_idx + data_unit_size > buf_size)
             av_log(s->avctx, AV_LOG_ERROR,
                    "Data unit with size %d is larger than input buffer, discarding\n",
                    data_unit_size);