[FFmpeg-cvslog] Prevent NULL dereference when the palette is missing in the xan decoder.

[Laurent Aimar]

ffmpeg | branch: master | Laurent Aimar <fenrir at videolan.org> | Thu Sep 29 01:04:51 2011 +0200| [56ee5a9ad1b385129c40ba4773f99bc5943ae8af] | committer: Michael Niedermayer

Prevent NULL dereference when the palette is missing in the xan decoder.

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

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=56ee5a9ad1b385129c40ba4773f99bc5943ae8af
---

 libavcodec/xan.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/libavcodec/xan.c b/libavcodec/xan.c
index 51b4b95..fe11ac3 100644
--- a/libavcodec/xan.c
+++ b/libavcodec/xan.c
@@ -552,6 +552,9 @@ static int xan_decode_frame(AVCodecContext *avctx,
         }
         buf_size = buf_end - buf;
     }
+    if (s->palettes_count <= 0)
+        return AVERROR_INVALIDDATA;
+
     if ((ret = avctx->get_buffer(avctx, &s->current_frame))) {
         av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
         return ret;