[dm-devel] [PATCH 5/6] libmultipath: check udev* renturn value in get_ctrl_blkdev

[lixiaokeng]

We check 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/foreign/nvme.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/libmultipath/foreign/nvme.c b/libmultipath/foreign/nvme.c
index 0bc5106e..a0668713 100644
--- a/libmultipath/foreign/nvme.c
+++ b/libmultipath/foreign/nvme.c
@@ -538,6 +538,7 @@ struct udev_device *get_ctrl_blkdev(const struct context *ctx,
 	struct udev_list_entry *item;
 	struct udev_device *blkdev = NULL;
 	struct udev_enumerate *enm = udev_enumerate_new(ctx->udev);
+	const char *devtype;

 	if (enm == NULL)
 		return NULL;
@@ -562,7 +563,9 @@ struct udev_device *get_ctrl_blkdev(const struct context *ctx,
 					   udev_list_entry_get_name(item));
 		if (tmp == NULL)
 			continue;
-		if (!strcmp(udev_device_get_devtype(tmp), "disk")) {
+
+		devtype = udev_device_get_devtype(tmp);
+		if (!devtype && !strcmp(devtype, "disk")) {
 			blkdev = tmp;
 			break;
 		} else
--