4.8-stable review patch. If anyone has any objections, please let me know.
------------------ From: Dmitry Vyukov <[email protected]> commit 32b2921e6a7461fe63b71217067a6cf4bddb132f upstream. Size of kmalloc() in vc_do_resize() is controlled by user. Too large kmalloc() size triggers WARNING message on console. Put a reasonable upper bound on terminal size to prevent WARNINGs. Signed-off-by: Dmitry Vyukov <[email protected]> CC: David Rientjes <[email protected]> Cc: One Thousand Gnomes <[email protected]> Cc: Greg Kroah-Hartman <[email protected]> Cc: Jiri Slaby <[email protected]> Cc: Peter Hurley <[email protected]> Cc: [email protected] Cc: [email protected] Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/tty/vt/vt.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/tty/vt/vt.c +++ b/drivers/tty/vt/vt.c @@ -870,6 +870,8 @@ static int vc_do_resize(struct tty_struc if (new_cols == vc->vc_cols && new_rows == vc->vc_rows) return 0; + if (new_screen_size > (4 << 20)) + return -EINVAL; newscreen = kmalloc(new_screen_size, GFP_USER); if (!newscreen) return -ENOMEM;
