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avcodec/scpr3: Fix out of array access with dectab
Fixes: 23721/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SCPR_fuzzer-5914074721550336 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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@ -234,6 +234,8 @@ static int update_model6_to_7(PixelModel3 *m)
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}
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p = (e + 127) >> 7;
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k = ((f + e - 1) >> 7) + 1;
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if (k > FF_ARRAY_ELEMS(n.dectab))
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return AVERROR_INVALIDDATA;
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for (i = 0; i < k - p; i++)
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n.dectab[p + i] = j;
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e += f;
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@ -702,7 +704,11 @@ static int update_model3_to_7(PixelModel3 *m, uint8_t value)
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e = d;
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n.cntsum += n.cnts[e];
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n.freqs1[e] = c;
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for (g = n.freqs[e], q = c + 128 - 1 >> 7, f = (c + g - 1 >> 7) + 1; q < f; q++) {
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g = n.freqs[e];
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f = (c + g - 1 >> 7) + 1;
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if (f > FF_ARRAY_ELEMS(n.dectab))
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return AVERROR_INVALIDDATA;
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for (q = c + 128 - 1 >> 7; q < f; q++) {
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n.dectab[q] = e;
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}
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c += g;
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@ -837,6 +843,7 @@ static int decode_unit3(SCPRContext *s, PixelModel3 *m, uint32_t code, uint32_t
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uint16_t a = 0, b = 0;
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uint32_t param;
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int type;
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int ret;
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type = m->type;
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switch (type) {
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@ -859,7 +866,9 @@ static int decode_unit3(SCPRContext *s, PixelModel3 *m, uint32_t code, uint32_t
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break;
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case 3:
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*value = bytestream2_get_byte(&s->gb);
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decode_static3(m, *value);
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ret = decode_static3(m, *value);
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if (ret < 0)
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return AVERROR_INVALIDDATA;
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sync_code3(gb, rc);
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break;
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case 4:
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@ -877,7 +886,9 @@ static int decode_unit3(SCPRContext *s, PixelModel3 *m, uint32_t code, uint32_t
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break;
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case 6:
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if (!decode_adaptive6(m, code, value, &a, &b)) {
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update_model6_to_7(m);
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ret = update_model6_to_7(m);
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if (ret < 0)
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return AVERROR_INVALIDDATA;
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}
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decode3(gb, rc, a, b);
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sync_code3(gb, rc);
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