From 63a9fe1d445f04eb83a7d0f9d27355c2baf9c5bf Mon Sep 17 00:00:00 2001
From: Andreas Schneider <asn@samba.org>
Date: Mon, 12 Nov 2018 15:47:46 +0100
Subject: nsswitch: Handle possible NULL return value of getprogname()

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
---
 nsswitch/wb_common.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

(limited to 'nsswitch')

diff --git a/nsswitch/wb_common.c b/nsswitch/wb_common.c
index 6eea32c7e2a..f2672fb1298 100644
--- a/nsswitch/wb_common.c
+++ b/nsswitch/wb_common.c
@@ -89,14 +89,19 @@ void winbind_set_client_name(const char *name)
 static const char *winbind_get_client_name(void)
 {
 	if (client_name[0] == '\0') {
+		const char *progname = getprogname();
 		int len;
 
+		if (progname == NULL) {
+			progname = "<unknown>";
+		}
+
 		len = snprintf(client_name,
 			       sizeof(client_name),
 			       "%s",
-			       getprogname());
+			       progname);
 		if (len <= 0) {
-			return "<unkonwn>";
+			return progname;
 		}
 	}
 
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