free subtitle_header before overwriting it to avoid memleak

Originally committed as revision 26176 to svn://svn.ffmpeg.org/ffmpeg/trunk

diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index d82f5891818ae40c2b89b8e34ccfac1eb5fc0df4..ce7473587e035ae8e3181ccc11c0c513bbafa797 100644 (file)
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -505,6 +505,11 @@ int attribute_align_arg avcodec_open(AVCodecContext *avctx, AVCodec *codec)
         avcodec_set_dimensions(avctx, 0, 0);
     }
 
+    /* if the decoder init function was already called previously,
+       free the already allocated subtitle_header before overwriting it */
+    if (codec->decode)
+        av_freep(&avctx->subtitle_header);
+
 #define SANE_NB_CHANNELS 128U
     if (avctx->channels > SANE_NB_CHANNELS) {
         ret = AVERROR(EINVAL);