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(svn r22873) -Fix [FS#4747]: Validate image dimensions before loading. (Based on patch by monoid)

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michi_cc
2011-09-02 20:16:34 +00:00
parent 7c8cf74bfa
commit 4b6c2259ed
3 changed files with 35 additions and 3 deletions
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25
src/heightmap.cpp
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@@ -142,13 +142,24 @@ static bool ReadHeightmapPNG(char *filename, uint *x, uint *y, byte **map)
return false;
}
uint width = png_get_image_width(png_ptr, info_ptr);
uint height = png_get_image_height(png_ptr, info_ptr);
/* Check if image dimensions don't overflow a size_t to avoid memory corruption. */
if ((uint64)width * height >= (size_t)-1) {
ShowErrorMessage(STR_ERROR_PNGMAP, STR_ERROR_HEIGHTMAP_TOO_LARGE, WL_ERROR);
fclose(fp);
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return false;
}
if (map != NULL) {
*map = MallocT<byte>(png_get_image_width(png_ptr, info_ptr) * png_get_image_height(png_ptr, info_ptr));
*map = MallocT<byte>(width * height);
ReadHeightmapPNGImageData(*map, png_ptr, info_ptr);
}
*x = png_get_image_width(png_ptr, info_ptr);
*y = png_get_image_height(png_ptr, info_ptr);
*x = width;
*y = height;
fclose(fp);
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
@@ -243,6 +254,14 @@ static bool ReadHeightmapBMP(char *filename, uint *x, uint *y, byte **map)
return false;
}
/* Check if image dimensions don't overflow a size_t to avoid memory corruption. */
if ((uint64)info.width * info.height >= (size_t)-1 / (info.bpp == 24 ? 3 : 1)) {
ShowErrorMessage(STR_ERROR_BMPMAP, STR_ERROR_HEIGHTMAP_TOO_LARGE, WL_ERROR);
fclose(f);
BmpDestroyData(&data);
return false;
}
if (map != NULL) {
if (!BmpReadBitmap(&buffer, &info, &data)) {
ShowErrorMessage(STR_ERROR_BMPMAP, STR_ERROR_BMPMAP_IMAGE_TYPE, WL_ERROR);