xan: Prevent NULL dereference with missing palette

Signed-off-by: Janne Grunau <janne-libav@jannau.net>
13 years ago · 7d17a794f0
parent 3db3fdf4c6
commit 7d17a794f0
1 changed files with 5 additions and 0 deletions
--- a/libavcodec/xan.c
+++ b/libavcodec/xan.c
@ -553,6 +553,11 @@ static int xan_decode_frame(AVCodecContext *avctx,
        }
        buf_size = buf_end - buf;
    }
+    if (s->palettes_count <= 0) {
+        av_log(s->avctx, AV_LOG_ERROR, "No palette found\n");
+        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;