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avcodec/rasc: Check uncompressed dlta size

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We assume that if the compressed size is bigger than if each byte is encoded in a single raw packet
that the data is invalid.

Fixes: Out of memory
Fixes: 12208/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_RASC_fuzzer-5648916473708544

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-01-23 00:16:02 +01:00
parent db1c4acd02
commit f4079d5174
1 changed files with 2 additions and 0 deletions
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2
libavcodec/rasc.c
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@ -353,6 +353,8 @@ static int decode_dlta(AVCodecContext *avctx,
compression = bytestream2_get_le32(gb);
if (compression == 1) {
if (w * h * s->bpp * 3 < uncompressed_size)
return AVERROR_INVALIDDATA;
ret = decode_zlib(avctx, avpkt, size, uncompressed_size);
if (ret < 0)
return ret;