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-rw-r--r--tests/ossfuzz/fuzz_common.h56
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diff --git a/tests/ossfuzz/fuzz_common.h b/tests/ossfuzz/fuzz_common.h
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+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file fuzz_decode_auto.c
+/// \brief Fuzz test program for liblzma lzma_auto_decoder()
+//
+// Author: Maksym Vatsyk
+//
+// 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"
+
+// Some header values can make liblzma allocate a lot of RAM
+// (up to about 4 GiB with liblzma 5.2.x). We set a limit here to
+// prevent extreme allocations when fuzzing.
+#define MEM_LIMIT (300 << 20) // 300 MiB
+
+
+// Output buffer for decompressed data. This is write only; nothing cares
+// about the actual data written here.
+static uint8_t outbuf[4096];
+
+
+static void
+fuzz_code(lzma_stream *stream, const uint8_t *inbuf, size_t inbuf_size) {
+ // Give the whole input buffer at once to liblzma.
+ // Output buffer isn't initialized as liblzma only writes to it.
+ stream->next_in = inbuf;
+ stream->avail_in = inbuf_size;
+ stream->next_out = outbuf;
+ stream->avail_out = sizeof(outbuf);
+
+ lzma_ret ret;
+ while ((ret = lzma_code(stream, LZMA_FINISH)) == LZMA_OK) {
+ if (stream->avail_out == 0) {
+ // outbuf became full. We don't care about the
+ // uncompressed data there, so we simply reuse
+ // the outbuf and overwrite the old data.
+ stream->next_out = outbuf;
+ stream->avail_out = sizeof(outbuf);
+ }
+ }
+
+ // LZMA_PROG_ERROR should never happen as long as the code calling
+ // the liblzma functions is correct. Thus LZMA_PROG_ERROR is a sign
+ // of a bug in either this function or in liblzma.
+ if (ret == LZMA_PROG_ERROR) {
+ fprintf(stderr, "lzma_code() returned LZMA_PROG_ERROR\n");
+ abort();
+ }
+}