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LibGfx/WebP: Check that animation frame dimensions are in bounds

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Nico Weber 2023-05-06 06:01:58 -04:00 • committed by Andreas Kling
parent 0b70ecb7e6
commit 23ce1f641c
1 changed files with 7 additions and 0 deletions
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7
Userland/Libraries/LibGfx/ImageFormats/WebPLoader.cpp
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@ -1387,6 +1387,13 @@ static ErrorOr<ANMFChunk> decode_webp_chunk_ANMF(WebPLoadingContext& context, Ch
dbgln_if(WEBP_DEBUG, "frame_x {} frame_y {} frame_width {} frame_height {} frame_duration {} blending_method {} disposal_method {}",
frame_x, frame_y, frame_width, frame_height, frame_duration, (int)blending_method, (int)disposal_method);
// https://developers.google.com/speed/webp/docs/riff_container#assembling_the_canvas_from_frames
// "assert VP8X.canvasWidth >= frame_right
// assert VP8X.canvasHeight >= frame_bottom"
VERIFY(context.first_chunk->type == FourCC("VP8X"));
if (frame_x + frame_width > context.vp8x_header.width || frame_y + frame_height > context.vp8x_header.height)
return context.error("WebPImageDecoderPlugin: ANMF dimensions out of bounds");
return ANMFChunk { frame_x, frame_y, frame_width, frame_height, frame_duration, blending_method, disposal_method, frame_data };
}