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avcodec/scpr3: Check bx

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Fixes: Out of array access
Fixes: 55102/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SCPR_fuzzer-4877396618903552

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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Michael Niedermayer 2023-01-16 00:01:13 +01:00
parent 4d42d82563
commit cc7e984a05
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1 changed files with 3 additions and 0 deletions
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libavcodec/scpr3.c
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@ -1167,6 +1167,9 @@ static int decompress_p3(AVCodecContext *avctx,
int run, bx = x * 16 + sx1, by = y * 16 + sy1;
uint32_t clr, ptype = 0, r, g, b;
if (bx >= avctx->width)
return AVERROR_INVALIDDATA;
for (; by < y * 16 + sy2 && by < avctx->height;) {
ret = decode_value3(s, 5, &s->op_model3[ptype].cntsum,
s->op_model3[ptype].freqs[0],