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avcodec/tiff: Check geotag count for being non zero

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Fixes memleak
Fixes: 874/clusterfuzz-testcase-5252796175613952

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-03-21 01:55:01 +01:00
parent aff80aa4ec
commit 3182e19c1c
1 changed files with 2 additions and 1 deletions
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3
libavcodec/tiff.c
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@ -1071,7 +1071,8 @@ static int tiff_decode_tag(TiffContext *s, AVFrame *frame)
s->geotag_count = count / 4 - 1;
av_log(s->avctx, AV_LOG_WARNING, "GeoTIFF key directory buffer shorter than specified\n");
}
if (bytestream2_get_bytes_left(&s->gb) < s->geotag_count * sizeof(int16_t) * 4) {
if ( bytestream2_get_bytes_left(&s->gb) < s->geotag_count * sizeof(int16_t) * 4
|| s->geotag_count == 0) {
s->geotag_count = 0;
return -1;
}