[dm-devel] [PATCH 4/6] libmultipath: check udev* return value in trigger_partitions_udev_change

[lixiaokeng]

We check the return value  of udev_device_get_devtype before
dereference it.

Signed-off-by:Lixiaokeng<Lixiaokeng at huawei.com>
Signed-off-by: Zhiqiang Liu <liuzhiqiang26 at huawei.com>
Signed-off-by: Linfeilong <linfeilong at huawei.com>
---
 libmultipath/configure.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libmultipath/configure.c b/libmultipath/configure.c
index 972cf5fe..7263707c 100644
--- a/libmultipath/configure.c
+++ b/libmultipath/configure.c
@@ -515,6 +515,7 @@ static void trigger_partitions_udev_change(struct udev_device *dev,
 {
 	struct udev_enumerate *part_enum;
 	struct udev_list_entry *item;
+	const char *devtype;

 	part_enum = udev_enumerate_new(udev);
 	if (!part_enum)
@@ -535,7 +536,8 @@ static void trigger_partitions_udev_change(struct udev_device *dev,
 		if (!part)
 			continue;

-		if (!strcmp("partition", udev_device_get_devtype(part))) {
+		devtype = udev_device_get_devtype(part);
+		if (devtype && !strcmp("partition", devtype)) {
 			condlog(4, "%s: triggering %s event for %s", __func__,
 				action, syspath);
 			sysfs_attr_set_value(part, "uevent", action, len);
--