nsswitch: Handle possible NULL return value of getprogname()

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>

diff --git a/nsswitch/wb_common.c b/nsswitch/wb_common.c
index 6eea32c7e2a9732ebd8652b09b80adf61ba6a206..f2672fb129875ce079cbdec6d858a0b67ff87ff7 100644 (file)
--- 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;
                }
        }