[FFmpeg-cvslog] shorten: Prevent block size from increasing
Laurent Aimar
git at videolan.org
Mon Jun 4 12:51:31 CEST 2012
ffmpeg | branch: release/0.6 | Laurent Aimar <fenrir at elivagar.org> | Sun Oct 2 00:48:12 2011 +0000| [8f924ee66ff38e8758e404bac9d7cbd4c5676df8] | committer: Reinhard Tartler
shorten: Prevent block size from increasing
Signed-off-by: Janne Grunau <janne-libav at jannau.net>
(cherry picked from commit 95010d18b2d808db9a49377e41bc2f7cf4dfa03e)
Signed-off-by: Anton Khirnov <anton at khirnov.net>
(cherry picked from commit 22949c42edf5352c5fa8c43870efe20698432b35)
Signed-off-by: Reinhard Tartler <siretart at tauware.de>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=8f924ee66ff38e8758e404bac9d7cbd4c5676df8
---
libavcodec/shorten.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/libavcodec/shorten.c b/libavcodec/shorten.c
index 934da8e..833a817 100644
--- a/libavcodec/shorten.c
+++ b/libavcodec/shorten.c
@@ -486,9 +486,15 @@ static int shorten_decode_frame(AVCodecContext *avctx,
case FN_BITSHIFT:
s->bitshift = get_ur_golomb_shorten(&s->gb, BITSHIFTSIZE);
break;
- case FN_BLOCKSIZE:
- s->blocksize = get_uint(s, av_log2(s->blocksize));
+ case FN_BLOCKSIZE: {
+ int blocksize = get_uint(s, av_log2(s->blocksize));
+ if (blocksize > s->blocksize) {
+ av_log(avctx, AV_LOG_ERROR, "Increasing block size is not supported\n");
+ return AVERROR_PATCHWELCOME;
+ }
+ s->blocksize = blocksize;
break;
+ }
case FN_QUIT:
*data_size = 0;
return buf_size;
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