[PATCH for 4.19.y 1/3] Smack:- Use overlay inode label in smack_inode_copy_up()

[Munehisa Kamata <kamatam@amazon.com>]

From: Vishal Goel <vishal.goel@samsung.com>

commit 387ef964460f14fe1c1ea29aba70e22731ea7cf7 upstream.

Currently in "smack_inode_copy_up()" function, process label is
changed with the label on parent inode. Due to which,
process is assigned directory label and whatever file or directory
created by the process are also getting directory label
which is wrong label.

Changes has been done to use label of overlay inode instead
of parent inode.

Signed-off-by: Vishal Goel <vishal.goel@samsung.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
[4.19: adjusted for the lack of helper functions]
Fixes: d6d80cb57be4 ("Smack: Base support for overlayfs")
Signed-off-by: Munehisa Kamata <kamatam@amazon.com>
---
 security/smack/smack_lsm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 4f65d953fe31..a09a9c6bbdf6 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -4612,7 +4612,7 @@ static int smack_inode_copy_up(struct dentry *dentry, struct cred **new)
 	/*
 	 * Get label from overlay inode and set it in create_sid
 	 */
-	isp = d_inode(dentry->d_parent)->i_security;
+	isp = d_inode(dentry)->i_security;
 	skp = isp->smk_inode;
 	tsp->smk_task = skp;
 	*new = new_creds;
-- 
2.34.1