vt: clear selection before resizing

commit 009e39a upstream. When resizing a vt its selection may exceed the new size, resulting in an invalid memory access [1]. Clear the selection before resizing. [1] http://lkml.kernel.org/r/CACT4Y+acDTwy4umEvf5ROBGiRJNrxHN4Cn5szCXE5Jw-d1B=Xw@mail.gmail.com Reported-and-tested-by: Dmitry Vyukov <[email protected]> Signed-off-by: Scot Doyle <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
dlech · Nov 10, 2016 · 3425e39 · 3425e39
1 parent dc1555e
commit 3425e39
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
@@ -876,6 +876,9 @@ static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 	if (!newscreen)
 		return -ENOMEM;
 
+	if (vc == sel_cons)
+		clear_selection();
+
 	old_rows = vc->vc_rows;
 	old_row_size = vc->vc_size_row;