tty: wipe buffer.

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>

diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c
index 143deb62467d57a1f1216d3f418c2bfccb72201c..0d3fc2dae23a7c16a3f6d2692e914b27b0cd8a82 100644 (file)
--- a/drivers/tty/tty_buffer.c
+++ b/drivers/tty/tty_buffer.c
@@ -415,6 +415,8 @@ receive_buf(struct tty_struct *tty, struct tty_buffer *head, int count)
                        disc->ops->receive_buf(tty, p, f, count);
        }
        head->read += count;
+       if (count > 0)
+               memset(p, 0, count);
        return count;
 }