Code: static struct posix_acl *jffs2_get_acl(struct inode *inode, int type)
 {
        struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
        struct posix_acl *acl;
	char *value = NULL;
	int rc, xprefix;

	switch (type) {
	case ACL_TYPE_ACCESS:
		acl = jffs2_iget_acl(inode, &f->i_acl_access);
		if (acl != JFFS2_ACL_NOT_CACHED)
			return acl;
		xprefix = JFFS2_XPREFIX_ACL_ACCESS;
		break;
	case ACL_TYPE_DEFAULT:
		acl = jffs2_iget_acl(inode, &f->i_acl_default);
		if (acl != JFFS2_ACL_NOT_CACHED)
			return acl;
		xprefix = JFFS2_XPREFIX_ACL_DEFAULT;
		break;
	default:
		return ERR_PTR(-EINVAL);
	}
	rc = do_jffs2_getxattr(inode, xprefix, "", NULL, 0);
	if (rc > 0) {
		value = kmalloc(rc, GFP_KERNEL);
		if (!value)
			return ERR_PTR(-ENOMEM);
		rc = do_jffs2_getxattr(inode, xprefix, "", value, rc);
	}
	if (rc > 0) {
		acl = jffs2_acl_from_medium(value, rc);
	} else if (rc == -ENODATA || rc == -ENOSYS) {
		acl = NULL;
	} else {
		acl = ERR_PTR(rc);
	}
	if (value)
		kfree(value);
	if (!IS_ERR(acl)) {
		switch (type) {
		case ACL_TYPE_ACCESS:
			jffs2_iset_acl(inode, &f->i_acl_access, acl);
			break;
		case ACL_TYPE_DEFAULT:
			jffs2_iset_acl(inode, &f->i_acl_default, acl);
			break;
		}
	}
	return acl;
}

Vulnerability Type: 
CWE ID: CWE-264
Summary: JFFS2, as used on One Laptop Per Child (OLPC) build 542 and possibly other Linux systems, when POSIX ACL support is enabled, does not properly store permissions during (1) inode creation or (2) ACL setting, which might allow local users to access restricted files or directories after a remount of a filesystem, related to "legacy modes" and an inconsistency between dentry permissions and inode permissions.
Commit Message: 