1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index a9d256d6e909..6e1f1505f04e 100644
--- a/drivers/tty/pty.c
+++ b/drivers/tty/pty.c
@@ -210,6 +210,9 @@ static int pty_signal(struct tty_struct *tty, int sig)
 {
         struct pid *pgrp;
 
+        if (sig != SIGINT && sig != SIGQUIT && sig != SIGTSTP)
+                return -EINVAL;
+
         if (tty->link) {
                 pgrp = tty_get_pgrp(tty->link);
                 if (pgrp)