device-mapper-multipath/0104-libmultipath-snprint_devices-avoid-NULL-dereference.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Martin Wilck <mwilck@suse.com>
Date: Mon, 25 Jan 2021 16:12:10 +0100
Subject: [PATCH] libmultipath: snprint_devices(): avoid NULL dereference

All libudev functions may return NULL. Watch out for it.

Fixes: d041258 ("libmultipath: snprint_devices(): use udev_enumerate"
Reviewed-by: Benjamin Marzinski <bmarzins@redhat.com>
Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
---
 libmultipath/print.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/libmultipath/print.c b/libmultipath/print.c
index 19de2c7c..8151e11e 100644
--- a/libmultipath/print.c
+++ b/libmultipath/print.c
@@ -2055,8 +2055,16 @@ int snprint_devices(struct config *conf, char *buff, size_t len,
 		struct udev_device *u_dev;
 
 		path = udev_list_entry_get_name(item);
+		if (!path)
+			continue;
 		u_dev = udev_device_new_from_syspath(udev, path);
+		if (!u_dev)
+			continue;
 		devname = udev_device_get_sysname(u_dev);
+		if (!devname) {
+			udev_device_unref(u_dev);
+			continue;
+		}
 
 		fwd += snprintf(buff + fwd, len - fwd, "    %s", devname);
 		if (fwd >= len)
-- 
2.17.2