Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6:
SELinux: properly handle empty tty_files list
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 3e3fde7c..f85597a 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2126,14 +2126,16 @@
tty = get_current_tty();
if (tty) {
file_list_lock();
- file = list_entry(tty->tty_files.next, typeof(*file), f_u.fu_list);
- if (file) {
+ if (!list_empty(&tty->tty_files)) {
+ struct inode *inode;
+
/* Revalidate access to controlling tty.
Use inode_has_perm on the tty inode directly rather
than using file_has_perm, as this particular open
file may belong to another process and we are only
interested in the inode-based check here. */
- struct inode *inode = file->f_path.dentry->d_inode;
+ file = list_first_entry(&tty->tty_files, struct file, f_u.fu_list);
+ inode = file->f_path.dentry->d_inode;
if (inode_has_perm(current, inode,
FILE__READ | FILE__WRITE, NULL)) {
drop_tty = 1;