[PATCH] selinux: fix dentry_open() error check

[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>

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

Index: work-fault-inject/security/selinux/hooks.c
===================================================================
--- work-fault-inject.orig/security/selinux/hooks.c
+++ work-fault-inject/security/selinux/hooks.c
@@ -1760,7 +1760,8 @@ 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;