4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
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@xxxxxxxxx>
Tested-by: Daniel Zatovic <daniel.zatovic@xxxxxxxxx>
Tested-by: aszlig <aszlig@nix.build>
Cc: Willy Tarreau <w@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/tty_buffer.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
--- a/drivers/tty/tty_buffer.c
+++ b/drivers/tty/tty_buffer.c
@@ -468,11 +468,15 @@ receive_buf(struct tty_port *port, struc
{
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;
}
/**
