From 59e7477c5a18ec4bcb1f9b1e20d2303b4e0cafb1 Mon Sep 17 00:00:00 2001
From: Martin George <marting@netapp.com>
Date: Thu, 5 Aug 2021 18:01:24 +0530
Subject: [PATCH] nvme-print: fix 'nvme list' segfault if controller is
 unavailable

Check if the controller is available before dereferencing the
controller attributes.

Signed-off-by: Martin George <marting@netapp.com>
---
 nvme-print.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/nvme-print.c b/nvme-print.c
index 8a2cbc4..0c0ec3b 100755
--- a/nvme-print.c
+++ b/nvme-print.c
@@ -6147,6 +6147,9 @@ static void nvme_show_list_item(struct nvme_namespace *n)
 	struct stat st;
 	int ret;
 
+	if (!n->ctrl)
+		return;
+
 	sprintf(path, "%s%s", n->ctrl->path, n->name);
 	ret = stat(path, &st);
 	if (ret < 0)
@@ -6203,6 +6206,9 @@ static void nvme_show_details_ns(struct nvme_namespace *n, bool ctrl)
 	char usage[128];
 	char format[128];
 
+	if (!n->ctrl)
+		return;
+
 	sprintf(usage,"%6.2f %2sB / %6.2f %2sB", nuse, u_suffix,
 		nsze, s_suffix);
 	sprintf(format,"%3.0f %2sB + %2d B", (double)lba, l_suffix,
@@ -6419,6 +6425,9 @@ static void json_simple_ns(struct nvme_namespace *n, struct json_object *devices
 	char *devnode;
 	struct stat st;
 
+	if (!n->ctrl)
+		return;
+
 	if (asprintf(&devnode, "%s%s", n->ctrl->path, n->name) < 0)
 		return;
 
-- 
2.27.0