[PATCH 4.9 80/92] tty: wipe buffer.

Greg Kroah-Hartman
2018-11-29T14:23:38Z

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
@@ -458,6 +458,8 @@ int tty_ldisc_receive_buf(struct tty_ldi
if (count && ld->ops->receive_buf)
ld->ops->receive_buf(ld->tty, p, f, count);
}
+ if (count > 0)
+ memset(p, 0, count);
return count;
}
EXPORT_SYMBOL_GPL(tty_ldisc_receive_buf);