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avcodec/aliaspixdec: Check input size against minimal picture size

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Fixes: Timeout (15sec -> 72ms)
Fixes: 17774/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALIAS_PIX_fuzzer-5193929107963904

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 8c69310477)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2019-10-01 00:06:35 +02:00
parent a62cb90385
commit b30d2683c4
1 changed files with 3 additions and 0 deletions

3
libavcodec/aliaspixdec.c

@ -62,6 +62,9 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
if (ret < 0) if (ret < 0)
return ret; return ret;
if (bytestream2_get_bytes_left(&gb) < width*height / 255)
return AVERROR_INVALIDDATA;
ret = ff_get_buffer(avctx, f, 0); ret = ff_get_buffer(avctx, f, 0);
if (ret < 0) if (ret < 0)
return ret; return ret;