[PATCH 5/5] FIX: Validate input in ping_manager function

[Krzysztof Wojcik <krzysztof.wojcik@intel.com>]

For native case we do not have manager running so we have to
return without pinging.
Moreover we have NULL as input parameter. We should to avoid
segmentation fault.

Signed-off-by: Krzysztof Wojcik <krzysztof.wojcik@intel.com>
---
 msg.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/msg.c b/msg.c
index b97ebec..2c770ab 100644
--- a/msg.c
+++ b/msg.c
@@ -432,7 +432,13 @@ void unblock_monitor(char *container, const int unfreeze)
  */
 int ping_manager(char *devname)
 {
-	int sfd = connect_monitor(devname);
+	int sfd;
+
+	if (!devname)
+		return -1;
+
+	sfd = connect_monitor(devname);
+
 	struct metadata_update msg = { .len = -1 };
 	int err = 0;