diff options
| -rw-r--r-- | image/decoders/nsPNGDecoder.cpp | 18 |
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 |