Merging upstream version 5.6.2.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 53 insertions, 0 deletions

diff --git a/tests/ossfuzz/fuzz_decode_stream.c b/tests/ossfuzz/fuzz_decode_stream.c
new file mode 100644
index 0000000..d786061
--- /dev/null
+++ b/tests/ossfuzz/fuzz_decode_stream.c
@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: 0BSD
+
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       fuzz_decode_stream.c
+/// \brief      Fuzz test program for single threaded .xz decoding
+//
+//  Authors:    Lasse Collin
+//              Maksym Vatsyk
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#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 .xz decoder using the memory usage limit
+	// defined in fuzz_common.h
+	//
+	// Enable support for concatenated .xz files which is used when
+	// decompressing regular .xz files (instead of data embedded inside
+	// some other file format). Integrity checks on the uncompressed
+	// data are ignored to make fuzzing more effective (incorrect check
+	// values won't prevent the decoder from processing more input).
+	//
+	// The flag LZMA_IGNORE_CHECK doesn't disable verification of
+	// header CRC32 values. Those checks are disabled when liblzma is
+	// built with the #define FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION.
+	lzma_ret ret = lzma_stream_decoder(&strm, MEM_LIMIT,
+			LZMA_CONCATENATED | LZMA_IGNORE_CHECK);
+
+	if (ret != 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_stream_decoder() failed (%d)\n", ret);
+		abort();
+	}
+
+	fuzz_code(&strm, inbuf, inbuf_size);
+
+	// Free the allocated memory.
+	lzma_end(&strm);
+
+	return 0;
+}