[PATCH] tty: vt: selection: Add check for valid tiocl_selection values
From: Helge Deller <deller@gmx.de>
Date: 2022-07-30 18:49:53
Also in:
dri-devel, lkml
Subsystem:
the rest, tty layer and serial drivers · Maintainers:
Linus Torvalds, Greg Kroah-Hartman, Jiri Slaby
The line and column numbers for the selection need to start at 1. Add the checks to prevent invalid input. Signed-off-by: Helge Deller <deller@gmx.de> Reported-by: syzbot+14b0e8f3fd1612e35350@syzkaller.appspotmail.com
diff --git a/drivers/tty/vt/selection.c b/drivers/tty/vt/selection.c
index f7755e73696e..58692a9b4097 100644
--- a/drivers/tty/vt/selection.c
+++ b/drivers/tty/vt/selection.c@@ -326,6 +326,9 @@ static int vc_selection(struct vc_data *vc, struct tiocl_selection *v, return 0; } + if (!v->xs || !v->ys || !v->xe || !v->ye) + return -EINVAL; + v->xs = min_t(u16, v->xs - 1, vc->vc_cols - 1); v->ys = min_t(u16, v->ys - 1, vc->vc_rows - 1); v->xe = min_t(u16, v->xe - 1, vc->vc_cols - 1);