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avcodec/jvdec: Check available input space before decode8x8()

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Fixes: Timeout (78 sec -> 15 millisec)
Fixes: 13147/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JV_fuzzer-5727107827630080

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 2019-02-21 01:09:43 +01:00
parent 00f54c15f4
commit 61523683c5
1 changed files with 5 additions and 0 deletions
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5
libavcodec/jvdec.c
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@ -170,6 +170,11 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
GetBitContext gb;
init_get_bits(&gb, buf, 8 * video_size);
if (avctx->height/8 * (avctx->width/8) > 4 * video_size) {
av_log(avctx, AV_LOG_ERROR, "Insufficient input data for dimensions\n");
return AVERROR_INVALIDDATA;
}
for (j = 0; j < avctx->height; j += 8)
for (i = 0; i < avctx->width; i += 8)
decode8x8(&gb,