linux-kernel - [PATCH 4.4 79/86] tty: wipe buffer.

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Message-Id: <20181129140116.150266432@linuxfoundation.org>
Date:   Thu, 29 Nov 2018 15:12:44 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, aszlig <aszlig@....build>,
        Milan Broz <gmazyland@...il.com>,
        Daniel Zatovic <daniel.zatovic@...il.com>,
        Willy Tarreau <w@....eu>
Subject: [PATCH 4.4 79/86] tty: wipe buffer.

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Linus Torvalds <torvalds@...ux-foundation.org>

commit c9a8e5fce009e3c601a43c49ea9dbcb25d1ffac5 upstream.

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

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

---
 drivers/tty/tty_buffer.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/tty/tty_buffer.c
+++ b/drivers/tty/tty_buffer.c
@@ -454,6 +454,8 @@ receive_buf(struct tty_struct *tty, stru
 		if (count && disc->ops->receive_buf)
 			disc->ops->receive_buf(tty, p, f, count);
 	}
+	if (count > 0)
+		memset(p, 0, count);
 	return count;
 }