[PATCH] apparmor: fix error code in aafs_create()

[Dan Carpenter]

We accidentally return ERR_PTR(0) if lookup_one_len() fails.  The caller
is expecting error pointers so it likely causes problems later on.  For
example, on one path I saw it triggered an AA_BUG().

Fixes: a481f4d91783 ("apparmor: add custom apparmorfs that will be used by policy namespace files")
Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>

diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorfs.c
index 853c2ec8e0c9..2caeb748070c 100644
--- a/security/apparmor/apparmorfs.c
+++ b/security/apparmor/apparmorfs.c
@@ -248,8 +248,10 @@ static struct dentry *aafs_create(const char *name, umode_t mode,
 
 	inode_lock(dir);
 	dentry = lookup_one_len(name, parent, strlen(name));
-	if (IS_ERR(dentry))
+	if (IS_ERR(dentry)) {
+		error = PTR_ERR(dentry);
 		goto fail_lock;
+	}
 
 	if (d_really_is_positive(dentry)) {
 		error = -EEXIST;
--
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