SELinux: fix memory leakage in /security/selinux/hooks.c

Fix memory leakage in /security/selinux/hooks.c

The buffer always needs to be freed here; we either error
out or allocate more memory.

Reported-by: iceberg <strakh@ispras.ru>
Signed-off-by: James Morris <jmorris@namei.org>
Acked-by:  Stephen Smalley <sds@tycho.nsa.gov>

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 15c2a08..1e8cfc4 100644 (file)
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -1285,6 +1285,8 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
                rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX,
                                           context, len);
                if (rc == -ERANGE) {
+                       kfree(context);
+
                        /* Need a larger buffer.  Query for the right size. */
                        rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX,
                                                   NULL, 0);
@@ -1292,7 +1294,6 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
                                dput(dentry);
                                goto out_unlock;
                        }
-                       kfree(context);
                        len = rc;
                        context = kmalloc(len+1, GFP_NOFS);
                        if (!context) {