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

Greg Kroah-Hartman
2018-11-29T14:20:31Z

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

commit c9a8e5fce009e3c601a43c49ea9dbcb25d1ffac5 upstream.

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>

---
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;
}