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Potential Vulnerability in Cloned Code #60

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Potential Vulnerability in Cloned Code #60

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7 changes: 7 additions & 0 deletions thirdparty/stb_image.h
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Original file line number Diff line number Diff line change
Expand Up @@ -3184,6 +3184,13 @@ static int stbi__process_frame_header(stbi__jpeg *z, int scan)
if (z->img_comp[i].v > v_max) v_max = z->img_comp[i].v;
}

// check that plane subsampling factors are integer ratios; our resamplers can't deal with fractional ratios
// and I've never seen a non-corrupted JPEG file actually use them
for (i=0; i < s->img_n; ++i) {
if (h_max % z->img_comp[i].h != 0) return stbi__err("bad H","Corrupt JPEG");
if (v_max % z->img_comp[i].v != 0) return stbi__err("bad V","Corrupt JPEG");
}

// compute interleaved mcu info
z->img_h_max = h_max;
z->img_v_max = v_max;
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