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LibGfx+Fuzz: Convert ImageDecoder::initialize to ErrorOr

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This prevents callers from accidentally discarding the result of
initialize(), which was the root cause of this OSS Fuzz bug:

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=55896&q=label%3AProj-serenity&sort=summary
This commit is contained in:
Ben Wiederhake 2023-05-07 19:27:07 +02:00 • committed by Sam Atkins
parent a84e64ed22
commit da394abe04
37 changed files with 125 additions and 105 deletions
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9
Userland/Libraries/LibGfx/ImageFormats/DDSLoader.cpp
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@ -645,14 +645,17 @@ bool DDSImageDecoderPlugin::set_nonvolatile(bool& was_purged)
return m_context->bitmap->set_nonvolatile(was_purged);
}
bool DDSImageDecoderPlugin::initialize()
ErrorOr<void> DDSImageDecoderPlugin::initialize()
{
// The header is always at least 128 bytes, so if the file is smaller, it can't be a DDS.
return m_context->data_size > 128
if (m_context->data_size > 128
&& m_context->data[0] == 0x44
&& m_context->data[1] == 0x44
&& m_context->data[2] == 0x53
&& m_context->data[3] == 0x20;
&& m_context->data[3] == 0x20)
return {};
return Error::from_string_literal("Bad image magic");
}
bool DDSImageDecoderPlugin::sniff(ReadonlyBytes data)