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reject >256-color external colormap in CreateInverseColorMap #237

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reject >256-color external colormap in CreateInverseColorMap #237

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4 changes: 4 additions & 0 deletions lib/jpegli/color_quantize.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -457,6 +457,10 @@ void CreateInverseColorMap(j_decompress_ptr cinfo) {
int ncomp = cinfo->out_color_components;
JPEGLI_CHECK(ncomp > 0);
JPEGLI_CHECK(ncomp <= kMaxComponents);
if (cinfo->actual_number_of_colors > 256) {
JPEGLI_ERROR("Too many quantization colors (%d)",
cinfo->actual_number_of_colors);
}
int num_cells = 1;
for (int c = 0; c < ncomp; ++c) {
num_cells *= (1 << kNumColorCellBits[c]);
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