56 lines
1.7 KiB
Diff
56 lines
1.7 KiB
Diff
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--- camlimages-3.0.1/src/pngread.c 2007-01-18 10:29:57.000000000 +0000
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+++ camlimages-3.0.1-oversized-png-checks/src/pngread.c 2009-07-03 14:19:42.000000000 +0100
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@@ -26,6 +26,12 @@
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#define PNG_TAG_INDEX16 2
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#define PNG_TAG_INDEX4 3
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+/* Test if x or y are negative, or if multiplying x * y would cause an
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+ * arithmetic overflow.
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+ */
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+#define oversized(x, y) \
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+ ((x) < 0 || (y) < 0 || (x) * (y) < (x) || (x) * (y) < (y))
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+
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value read_png_file_as_rgb24( name )
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value name;
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{
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@@ -81,6 +87,9 @@
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png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
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&interlace_type, NULL, NULL);
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+ if (oversized (width, height))
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+ failwith ("png error: image contains oversized or bogus width and height");
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+
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if ( color_type == PNG_COLOR_TYPE_GRAY ||
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color_type == PNG_COLOR_TYPE_GRAY_ALPHA ) {
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png_set_gray_to_rgb(png_ptr);
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@@ -102,6 +111,9 @@
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rowbytes = png_get_rowbytes(png_ptr, info_ptr);
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+ if (oversized (rowbytes, height))
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+ failwith ("png error: image contains oversized or bogus rowbytes and height");
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+
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{
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int i;
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png_bytep *row_pointers;
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@@ -235,6 +247,9 @@
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png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
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&interlace_type, NULL, NULL);
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+ if (oversized (width, height))
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+ failwith ("png error: image contains oversized or bogus width and height");
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+
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if ( color_type == PNG_COLOR_TYPE_GRAY ||
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color_type == PNG_COLOR_TYPE_GRAY_ALPHA ) {
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png_set_gray_to_rgb(png_ptr);
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@@ -251,6 +266,9 @@
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rowbytes = png_get_rowbytes(png_ptr, info_ptr);
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+ if (oversized (rowbytes, height))
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+ failwith ("png error: image contains oversized or bogus rowbytes and height");
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+
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/*
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fprintf(stderr, "pngread.c: actual loading\n"); fflush(stderr);
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*/
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