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avformat/asfdec_o: Check size_bmp more fully

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Fixes: integer overflow and out of array access
Fixes: asfo-crash-46080c4341572a7137a162331af77f6ded45cbd7

Found-by: Paul Ch <paulcher@icloud.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-07-03 21:01:23 +02:00
parent bab0716c7f
commit 2b46ebdbff
1 changed files with 2 additions and 1 deletions
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libavformat/asfdec_o.c
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@ -706,7 +706,8 @@ static int parse_video_info(AVIOContext *pb, AVStream *st)
st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag); st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag);
size_bmp = FFMAX(size_asf, size_bmp); size_bmp = FFMAX(size_asf, size_bmp);
if (size_bmp > BMP_HEADER_SIZE) { if (size_bmp > BMP_HEADER_SIZE &&
size_bmp < INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE) {
int ret; int ret;
st->codecpar->extradata_size = size_bmp - BMP_HEADER_SIZE; st->codecpar->extradata_size = size_bmp - BMP_HEADER_SIZE;
if (!(st->codecpar->extradata = av_malloc(st->codecpar->extradata_size + if (!(st->codecpar->extradata = av_malloc(st->codecpar->extradata_size +