Tests: Add fuzz_decode_alone OSS-Fuzz target

This fuzz target that handles LZMA alone decoding. A new fuzz
dictionary .dict was also created with common LZMA header values to
help speed up the discovery of valid headers.

1 files changed, 41 insertions, 0 deletions

diff --git a/tests/ossfuzz/fuzz_decode_alone.c b/tests/ossfuzz/fuzz_decode_alone.c
new file mode 100644
index 00000000..d07874bc
--- /dev/null
+++ b/tests/ossfuzz/fuzz_decode_alone.c
@@ -0,0 +1,41 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       fuzz_decode_auto.c
+/// \brief      Fuzz test program for liblzma lzma_auto_decoder()
+//
+//  Author:     Maksym Vatsyk
+//
+//  Based on Lasse Collin's original fuzzer for liblzma
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include <inttypes.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include "lzma.h"
+#include "fuzz_common.h"
+
+
+extern int
+LLVMFuzzerTestOneInput(const uint8_t *inbuf, size_t inbuf_size)
+{
+	lzma_stream strm = LZMA_STREAM_INIT;
+	// Initialize a LZMA alone decoder using the memory usage limit
+	// defined in fuzz_common.h
+	if (lzma_alone_decoder(&strm, MEM_LIMIT) != LZMA_OK) {
+		// This should never happen unless the system has
+		// no free memory or address space to allow the small
+		// allocations that the initialization requires.
+		fprintf(stderr, "lzma_alone_decoder() failed\n");
+		abort();
+	}
+
+	fuzz_code(&strm, inbuf, inbuf_size);
+
+	// Free the allocated memory.
+	lzma_end(&strm);
+	return 0;
+}