From d1a44a9c1aa56cc13def314f532fe76f82124219 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marc=20Andr=C3=A9=20Tanner?= <mat@brain-dump.org>
Date: Mon, 16 Feb 2015 22:54:32 +0100
Subject: [PATCH] Check return value of open(2) #30720

---
 abduco.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/abduco.c b/abduco.c
index 04ef60c..c74ee23 100644
--- a/abduco.c
+++ b/abduco.c
@@ -347,9 +347,12 @@ static bool create_session(const char *name, char * const argv[]) {
 				chdir("/");
 			#ifdef NDEBUG
 				int fd = open("/dev/null", O_RDWR);
-				dup2(fd, 0);
-				dup2(fd, 1);
-				dup2(fd, 2);
+				if (fd != -1) {
+					dup2(fd, 0);
+					dup2(fd, 1);
+					dup2(fd, 2);
+					close(fd);
+				}
 			#endif /* NDEBUG */
 				close(client_pipe[1]);
 				close(server_pipe[1]);