Adding upstream version 3.1.0+dfsg.

Signed-off-by: Daniel Baumann <daniel@debian.org>

tests/fuzz/yang_parse_module.c

@@ -0,0 +1,39 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+
+#include "libyang.h"
+
+int LLVMFuzzerTestOneInput(uint8_t const *buf, size_t len)
+{
+    struct lys_module *mod;
+    uint8_t *data = NULL;
+    struct ly_ctx *ctx = NULL;
+    static bool log = false;
+    LY_ERR err;
+
+    if (!log) {
+        ly_log_options(0);
+        log = true;
+    }
+
+    err = ly_ctx_new(NULL, 0, &ctx);
+    if (err != LY_SUCCESS) {
+        fprintf(stderr, "Failed to create new context\n");
+        return 0;
+    }
+
+    data = malloc(len + 1);
+    if (data == NULL) {
+        fprintf(stderr, "Out of memory\n");
+        return 0;
+    }
+    memcpy(data, buf, len);
+    data[len] = 0;
+
+    lys_parse_mem(ctx, (const char *)data, LYS_IN_YANG, &mod);
+
+    free(data);
+    ly_ctx_destroy(ctx);
+    return 0;
+}