Fuzzers: Add a WebP fuzzer

Author: https://github.com/nico
Commit: https://github.com/SerenityOS/serenity/commit/a34b300393
Pull-request: https://github.com/SerenityOS/serenity/pull/18222
Reviewed-by: https://github.com/linusg
Reviewed-by: https://github.com/skyrising
Reviewed-by: https://github.com/timschumi

Meta/Lagom/Fuzzers/CMakeLists.txt

@@ -76,6 +76,7 @@ add_simple_fuzzer(FuzzRSAKeyParsing LibCrypto)
 add_simple_fuzzer(FuzzVP9Decoder LibVideo)
 add_simple_fuzzer(FuzzWAVLoader LibAudio)
 add_simple_fuzzer(FuzzWasmParser LibWasm)
+add_simple_fuzzer(FuzzWebPLoader LibGfx)
 add_simple_fuzzer(FuzzWOFF LibGfx)
 add_simple_fuzzer(FuzzXML LibXML)
 add_simple_fuzzer(FuzzZip LibArchive)

Meta/Lagom/Fuzzers/FuzzWebPLoader.cpp

@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) 2023, the SerenityOS developers.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibGfx/ImageFormats/WebPLoader.h>
+#include <stddef.h>
+#include <stdint.h>
+
+extern "C" int LLVMFuzzerTestOneInput(uint8_t const* data, size_t size)
+{
+    auto decoder_or_error = Gfx::WebPImageDecoderPlugin::create({ data, size });
+    if (decoder_or_error.is_error())
+        return 0;
+    auto decoder = decoder_or_error.release_value();
+    decoder->initialize();
+    (void)decoder->frame(0);
+    return 0;
+}