Check for failure opening /dev/null

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
sailfishos-mirror · Apr 6, 2020 · ce611d8 · ce611d8
1 parent cd0965a
commit ce611d8
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/auth.c b/auth.c
@@ -1185,8 +1185,10 @@ static int run_csd_script(struct openconnect_info *vpninfo, char *buf, int bufle
 		 */
 		if (ferror(stderr)) {
 			int nulfd = open("/dev/null", O_WRONLY);
-			dup2(nulfd, 2);
-			close(nulfd);
+			if (nulfd >= 0) {
+				dup2(nulfd, 2);
+				close(nulfd);
+			}
 		}
                 dup2(2, 1);
                 if (vpninfo->csd_wrapper)