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Util: Add PNGRead safety checks

This commit is contained in:
Vicki Pfau 2020-06-25 01:54:33 -07:00
parent fbce061806
commit a903fe19d8
1 changed files with 12 additions and 0 deletions
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12
src/util/png-io.c
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@ -273,6 +273,10 @@ bool PNGIgnorePixels(png_structp png, png_infop info) {
}
bool PNGReadPixels(png_structp png, png_infop info, void* pixels, unsigned width, unsigned height, unsigned stride) {
if (png_get_channels(png, info) != 3) {
return false;
}
if (setjmp(png_jmpbuf(png))) {
return false;
}
@ -324,6 +328,10 @@ bool PNGReadPixels(png_structp png, png_infop info, void* pixels, unsigned width
}
bool PNGReadPixelsA(png_structp png, png_infop info, void* pixels, unsigned width, unsigned height, unsigned stride) {
if (png_get_channels(png, info) != 4) {
return false;
}
if (setjmp(png_jmpbuf(png))) {
return false;
}
@ -375,6 +383,10 @@ bool PNGReadPixelsA(png_structp png, png_infop info, void* pixels, unsigned widt
}
bool PNGReadPixels8(png_structp png, png_infop info, void* pixels, unsigned width, unsigned height, unsigned stride) {
if (png_get_channels(png, info) != 1) {
return false;
}
if (setjmp(png_jmpbuf(png))) {
return false;
}