From: Akinobu Mita <akinobu.mita@gmail.com>

The return value of dentry_open() shoud be checked by IS_ERR().

Cc: Stephen Smalley <sds@tycho.nsa.gov>
Cc: James Morris <jmorris@namei.org>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 security/selinux/hooks.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff -puN security/selinux/hooks.c~selinux-fix-dentry_open-error-check security/selinux/hooks.c
--- a/security/selinux/hooks.c~selinux-fix-dentry_open-error-check
+++ a/security/selinux/hooks.c
@@ -1757,7 +1757,8 @@ static inline void flush_unauthorized_fi
 						get_file(devnull);
 					} else {
 						devnull = dentry_open(dget(selinux_null), mntget(selinuxfs_mount), O_RDWR);
-						if (!devnull) {
+						if (IS_ERR(devnull)) {
+							devnull = NULL;
 							put_unused_fd(fd);
 							fput(file);
 							continue;
_