fix: img_load_gif: out-of-bound access
according to imlib2's gif loader, bg should already be transparent black if bg > cmap->ColorCount
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ca7368aa89
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470f50f9f8
3
image.c
3
image.c
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@ -203,10 +203,13 @@ static bool img_load_gif(img_t *img, const fileinfo_t *file)
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ptr = data = emalloc(sw * sh * sizeof(DATA32));
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ptr = data = emalloc(sw * sh * sizeof(DATA32));
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cmap = gif->Image.ColorMap ? gif->Image.ColorMap : gif->SColorMap;
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cmap = gif->Image.ColorMap ? gif->Image.ColorMap : gif->SColorMap;
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/* if bg > cmap->ColorCount, it is transparent black already */
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if (cmap && bg >= 0 && bg < cmap->ColorCount) {
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r = cmap->Colors[bg].Red;
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r = cmap->Colors[bg].Red;
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g = cmap->Colors[bg].Green;
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g = cmap->Colors[bg].Green;
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b = cmap->Colors[bg].Blue;
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b = cmap->Colors[bg].Blue;
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bgpixel = 0x00ffffff & (r << 16 | g << 8 | b);
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bgpixel = 0x00ffffff & (r << 16 | g << 8 | b);
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}
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for (i = 0; i < sh; i++) {
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for (i = 0; i < sh; i++) {
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for (j = 0; j < sw; j++) {
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for (j = 0; j < sw; j++) {
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