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-rw-r--r--image/decoders/nsPNGDecoder.cpp18
1 files changed, 15 insertions, 3 deletions
diff --git a/image/decoders/nsPNGDecoder.cpp b/image/decoders/nsPNGDecoder.cpp
index 0f385b339..9596ae7d6 100644
--- a/image/decoders/nsPNGDecoder.cpp
+++ b/image/decoders/nsPNGDecoder.cpp
@@ -34,13 +34,18 @@ namespace image {
static LazyLogModule sPNGLog("PNGDecoder");
static LazyLogModule sPNGDecoderAccountingLog("PNGDecoderAccounting");
-// limit image dimensions (bug #251381, #591822, #967656, and #1283961)
+// Limit image dimensions.
#ifndef MOZ_PNG_MAX_WIDTH
-# define MOZ_PNG_MAX_WIDTH 0x7fffffff // Unlimited
+# define MOZ_PNG_MAX_WIDTH 65535
#endif
#ifndef MOZ_PNG_MAX_HEIGHT
-# define MOZ_PNG_MAX_HEIGHT 0x7fffffff // Unlimited
+# define MOZ_PNG_MAX_HEIGHT 65535
#endif
+// Maximum area supported in pixels (W*H)
+#ifndef MOZ_PNG_MAX_PIX
+# define MOZ_PNG_MAX_PIX 268435456 // 256 Mpix = 16Ki x 16Ki
+#endif
+
nsPNGDecoder::AnimFrameInfo::AnimFrameInfo()
: mDispose(DisposalMethod::KEEP)
@@ -568,6 +573,13 @@ nsPNGDecoder::info_callback(png_structp png_ptr, png_infop info_ptr)
png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
&interlace_type, &compression_type, &filter_type);
+ // Check sizes against cap limits and W*H
+ if ((width > MOZ_PNG_MAX_WIDTH) ||
+ (height > MOZ_PNG_MAX_HEIGHT) ||
+ (width * height > MOZ_PNG_MAX_PIX)) {
+ png_error(decoder->mPNG, "Image too large");
+ }
+
const IntRect frameRect(0, 0, width, height);
// Post our size to the superclass