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avcodec/pngdec: Check deloco index more exactly
Fixes: out of array access: Fixes: 48567/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PNG_fuzzer-6716193709096960 Alternatively it should be possible to limit this to 3 plane RGB 8 /16bit to ensure the size is what it should be 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 d5bae704068dc37191280e024eecb8d02b762b28) Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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@ -322,7 +322,7 @@ void ff_png_filter_row(PNGDSPContext *dsp, uint8_t *dst, int filter_type,
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static void deloco_ ## NAME(TYPE *dst, int size, int alpha) \
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{ \
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int i; \
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for (i = 0; i < size; i += 3 + alpha) { \
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for (i = 0; i < size - 2; i += 3 + alpha) { \
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int g = dst [i + 1]; \
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dst[i + 0] += g; \
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dst[i + 2] += g; \
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