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AK: Reject BitStream reads beyond EOF by default

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The only exception to this is the lossless WebP decoder, which
legitimately relies on this behavior, even upstream.
This commit is contained in:
Tim Schumacher 2023-11-11 13:57:48 +01:00 • committed by Andreas Kling
parent cb03d3d78f
commit 197331c922
2 changed files with 3 additions and 3 deletions
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2
AK/BitStream.h
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@ -156,7 +156,7 @@ public:
FillWithZero,
};
explicit LittleEndianInputBitStream(MaybeOwned<Stream> stream, UnsatisfiableReadBehavior unsatisfiable_read_behavior = UnsatisfiableReadBehavior::FillWithZero)
explicit LittleEndianInputBitStream(MaybeOwned<Stream> stream, UnsatisfiableReadBehavior unsatisfiable_read_behavior = UnsatisfiableReadBehavior::Reject)
: LittleEndianBitStream(move(stream))
, m_unsatisfiable_read_behavior(unsatisfiable_read_behavior)
{

4
Userland/Libraries/LibGfx/ImageFormats/WebPLoaderLossless.cpp
View file

@ -26,7 +26,7 @@ ErrorOr<VP8LHeader> decode_webp_chunk_VP8L_header(ReadonlyBytes vp8l_data)
return Error::from_string_literal("WebPImageDecoderPlugin: VP8L chunk too small");
FixedMemoryStream memory_stream { vp8l_data.trim(5) };
LittleEndianInputBitStream bit_stream { MaybeOwned<Stream>(memory_stream) };
LittleEndianInputBitStream bit_stream { MaybeOwned<Stream>(memory_stream), LittleEndianInputBitStream::UnsatisfiableReadBehavior::FillWithZero };
u8 signature = TRY(bit_stream.read_bits(8));
if (signature != 0x2f)
@ -931,7 +931,7 @@ ErrorOr<NonnullRefPtr<Bitmap>> ColorIndexingTransform::transform(NonnullRefPtr<B
ErrorOr<NonnullRefPtr<Bitmap>> decode_webp_chunk_VP8L_contents(VP8LHeader const& vp8l_header)
{
FixedMemoryStream memory_stream { vp8l_header.lossless_data };
LittleEndianInputBitStream bit_stream { MaybeOwned<Stream>(memory_stream) };
LittleEndianInputBitStream bit_stream { MaybeOwned<Stream>(memory_stream), LittleEndianInputBitStream::UnsatisfiableReadBehavior::FillWithZero };
// image-stream = optional-transform spatially-coded-image