[FFmpeg-cvslog] avformat/matroskaenc: Check ff_vorbiscomment_length in put_flac_codecpriv( )

[Michael Niedermayer]

ffmpeg | branch: release/2.4 | Michael Niedermayer <michaelni at gmx.at> | Mon May 11 15:37:38 2015 +0200| [c0ca9773a7024911fd50d6e3d66cbfa68a95ecc5] | committer: Michael Niedermayer

avformat/matroskaenc: Check ff_vorbiscomment_length in put_flac_codecpriv()

Its currently guaranteed to be smaller but its safer to check anyway

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
(cherry picked from commit 66f26b3e8ec075298e7ba329a55893d085bafe96)

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

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=c0ca9773a7024911fd50d6e3d66cbfa68a95ecc5
---

 libavformat/matroskaenc.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c
index e6230f9..395df0f 100644
--- a/libavformat/matroskaenc.c
+++ b/libavformat/matroskaenc.c
@@ -543,12 +543,15 @@ static int put_flac_codecpriv(AVFormatContext *s,
                              "Lavf" : LIBAVFORMAT_IDENT;
         AVDictionary *dict = NULL;
         uint8_t buf[32], *data, *p;
-        int len;
+        int64_t len;
 
         snprintf(buf, sizeof(buf), "0x%"PRIx64, codec->channel_layout);
         av_dict_set(&dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", buf, 0);
 
         len = ff_vorbiscomment_length(dict, vendor);
+        if (len >= ((1<<24) - 4))
+            return AVERROR(EINVAL);
+
         data = av_malloc(len + 4);
         if (!data) {
             av_dict_free(&dict);