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iff: fix integer overflow

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Fixes out of array accesses

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-03-05 01:35:28 +01:00
parent 7992bdbeb4
commit 3dbc0ff9c3
1 changed files with 3 additions and 0 deletions
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3
libavformat/iff.c
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@ -250,6 +250,8 @@ static int iff_read_header(AVFormatContext *s)
break;
case ID_CMAP:
if (data_size > INT_MAX - IFF_EXTRA_VIDEO_SIZE - FF_INPUT_BUFFER_PADDING_SIZE)
return AVERROR_INVALIDDATA;
st->codec->extradata_size = data_size + IFF_EXTRA_VIDEO_SIZE;
st->codec->extradata = av_malloc(data_size + IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
if (!st->codec->extradata)
@ -410,6 +412,7 @@ static int iff_read_header(AVFormatContext *s)
if (!st->codec->extradata)
return AVERROR(ENOMEM);
}
av_assert0(st->codec->extradata_size >= IFF_EXTRA_VIDEO_SIZE);
buf = st->codec->extradata;
bytestream_put_be16(&buf, IFF_EXTRA_VIDEO_SIZE);
bytestream_put_byte(&buf, iff->bitmap_compression);