From: Laszlo Papp <ext-laszlo.papp@nokia.com>
Date: Wed, 9 Mar 2011 16:01:30 +0000 (+0200)
Subject: Check the return value after an open syscall
X-Git-Tag: fuse_2_9_0~67
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=b812c4c40627809d92d7cb4b3de1059066399380;p=qemu-gpiodev%2Flibfuse.git

Check the return value after an open syscall
---

diff --git a/lib/mount_util.c b/lib/mount_util.c
index 5b660d6..aafddfb 100644
--- a/lib/mount_util.c
+++ b/lib/mount_util.c
@@ -100,8 +100,10 @@ static int add_mount(const char *progname, const char *fsname,
 		 * --no-canonicalize
 		 */
 		int fd = open("/dev/null", O_WRONLY);
-		dup2(fd, 1);
-		dup2(fd, 2);
+		if (fd >= 0) {
+			dup2(fd, 1);
+			dup2(fd, 2);
+		}
 
 		sigprocmask(SIG_SETMASK, &oldmask, NULL);
 		setuid(geteuid());