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shorten: fix "off by padding" bug

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Fixes array overread

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-05-22 17:39:22 +02:00
parent 14ec9d2590
commit ad22767cb6
1 changed files with 1 additions and 1 deletions
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libavcodec/shorten.c
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@ -437,7 +437,7 @@ static int shorten_decode_frame(AVCodecContext *avctx, void *data,
buf_size = FFMIN(buf_size, s->max_framesize - s->bitstream_size);
input_buf_size = buf_size;
if (s->bitstream_index + s->bitstream_size + buf_size >
if (s->bitstream_index + s->bitstream_size + buf_size + FF_INPUT_BUFFER_PADDING_SIZE >
s->allocated_bitstream_size) {
memmove(s->bitstream, &s->bitstream[s->bitstream_index],
s->bitstream_size);