[FFmpeg-cvslog] avcodec/mpeg12dec: check block index in mpeg2_fast_decode_block_non_intra( )
Michael Niedermayer
git at videolan.org
Fri Jan 24 18:38:54 CET 2014
ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Fri Jan 24 17:36:47 2014 +0100| [d82eccea2bf905cd51889954658f4e7f64876df8] | committer: Michael Niedermayer
avcodec/mpeg12dec: check block index in mpeg2_fast_decode_block_non_intra()
Prevents some overreads at the cost of 1 cpu cycle
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=d82eccea2bf905cd51889954658f4e7f64876df8
---
libavcodec/mpeg12dec.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/libavcodec/mpeg12dec.c b/libavcodec/mpeg12dec.c
index 86011d1..f574997 100644
--- a/libavcodec/mpeg12dec.c
+++ b/libavcodec/mpeg12dec.c
@@ -489,8 +489,9 @@ static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
}
block[j] = level;
- if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
+ if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF || i >= 64)
break;
+
UPDATE_CACHE(re, &s->gb);
}
end:
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