1 files changed, 74 insertions, 0 deletions
diff --git a/usr/src/test/os-tests/tests/OS-6097.c b/usr/src/test/os-tests/tests/OS-6097.c
new file mode 100644
index 0000000000..160c01e9c7
--- /dev/null
+++ b/usr/src/test/os-tests/tests/OS-6097.c
@@ -0,0 +1,74 @@
+/*
+ * This file and its contents are supplied under the terms of the
+ * Common Development and Distribution License ("CDDL"), version 1.0.
+ * You may only use this file in accordance with the terms of version
+ * 1.0 of the CDDL.
+ *
+ * A full copy of the text of the CDDL should have accompanied this
+ * source.  A copy of the CDDL is also available via the Internet at
+ * http://www.illumos.org/license/CDDL.
+ */
+
+/*
+ * Copyright (c) 2017, Joyent, Inc.
+ */
+
+/*
+ * Regression test for OS-6097.
+ */
+
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <libdlpi.h>
+#include <sys/debug.h>
+
+int
+main(void)
+{
+	int ret;
+	char path[4096];
+	uint_t num = 4294967294U;
+	dlpi_handle_t dh;
+
+	/*
+	 * First, we need to determine a path that doesn't exist to trigger this
+	 * bug. We start with the highest possible number and just decrement
+	 * until we find something.
+	 */
+
+	while (num > 0) {
+		struct stat st;
+
+		(void) snprintf(path, sizeof (path), "/dev/net/net%u", num);
+
+		ret = stat(path, &st);
+		if (ret == -1 && errno == ENOENT)
+			break;
+		if (ret == -1) {
+			(void) fprintf(stderr, "test failed: unexpected error "
+			    "running stat(2) on %s: %s\n", path,
+			    strerror(errno));
+			return (1);
+		}
+		num--;
+	}
+
+	/*
+	 * While technically this is a valid entry that we could try, at this
+	 * point we've exhausted so many NICs, there's likely a bug.
+	 */
+	if (num == 0) {
+		(void) fprintf(stderr, "failed to construct a non-existent "
+		    "NIC with a name starting with 'net'\n");
+		return (1);
+	}
+
+	(void) snprintf(path, sizeof (path), "net%u", num);
+	ret = dlpi_open(path, &dh, 0);
+	VERIFY3U(ret, ==, DLPI_ENOLINK);
+	return (0);
+}