Minor improvement of 'smack_sb_kern_mount'

Fix a possible memory access fault when transmute is true and isp is NULL.

Signed-off-by: José Bollo <jose.bollo@open.eurogiciel.org>

1 files changed, 5 insertions, 3 deletions

diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index d814e35987be..efa42991235e 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -413,9 +413,11 @@ static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
          * Initialize the root inode.
          */
         isp = inode->i_security;
-        if (inode->i_security == NULL) {
-                inode->i_security = new_inode_smack(sp->smk_root);
-                isp = inode->i_security;
+        if (isp == NULL) {
+                isp = new_inode_smack(sp->smk_root);
+                if (isp == NULL)
+                        return -ENOMEM;
+                inode->i_security = isp;
         } else
                 isp->smk_inode = sp->smk_root;