s3: add failure check.

Signed-off-by: Bo Yang <boyang@samba.org>

diff --git a/nsswitch/pam_winbind.c b/nsswitch/pam_winbind.c
index f692316fc63d6a1469581025e28fb144d0a722d4..4e84574d258b3a9db57fc4efcf2b108265810e3d 100644 (file)
--- a/nsswitch/pam_winbind.c
+++ b/nsswitch/pam_winbind.c
@@ -2298,9 +2298,12 @@ static char* winbind_upn_to_username(struct pwb_context *ctx,
        }
 
        name = talloc_strdup(ctx, upn);
+       if (!name) {
+               return NULL;
+       }
        if ((p = strchr(name, '@')) != NULL) {
                *p = 0;
-               domain = talloc_strdup(ctx, p + 1);
+               domain = p + 1;
        }
 
        /* Convert the UPN to a SID */