From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Thu, 4 Oct 2018 18:06:13 +0000 (-0700)
Subject: tty: wipe buffer.
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=c9a8e5fce009e3c601a43c49ea9dbcb25d1ffac5;p=linux.git

tty: wipe buffer.

After we are done with the tty buffer, zero it out.

Reported-by: aszlig <aszlig@nix.build>
Tested-by: Milan Broz <gmazyland@gmail.com>
Tested-by: Daniel Zatovic <daniel.zatovic@gmail.com>
Tested-by: aszlig <aszlig@nix.build>
Cc: Willy Tarreau <w@1wt.eu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c
index 76151c0028582..77070c2d12404 100644
--- a/drivers/tty/tty_buffer.c
+++ b/drivers/tty/tty_buffer.c
@@ -473,11 +473,15 @@ receive_buf(struct tty_port *port, struct tty_buffer *head, int count)
 {
 	unsigned char *p = char_buf_ptr(head, head->read);
 	char	      *f = NULL;
+	int n;
 
 	if (~head->flags & TTYB_NORMAL)
 		f = flag_buf_ptr(head, head->read);
 
-	return port->client_ops->receive_buf(port, p, f, count);
+	n = port->client_ops->receive_buf(port, p, f, count);
+	if (n > 0)
+		memset(p, 0, n);
+	return n;
 }
 
 /**