linux-kernel - [PATCH] staging: greybus: uart: fix uninitialized newline.flow

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Message-Id: <20170209130118.32127-1-colin.king@canonical.com>
Date:   Thu,  9 Feb 2017 13:01:18 +0000
From:   Colin King <colin.king@...onical.com>
To:     David Lin <dtwlin@...il.com>, Johan Hovold <johan@...nel.org>,
        Alex Elder <elder@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        greybus-dev@...ts.linaro.org, devel@...verdev.osuosl.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] staging: greybus: uart: fix uninitialized newline.flow_control

From: Colin Ian King <colin.king@...onical.com>

Currently newline.flow_control is uninitialized, so it can contain
any garbage from the stack.  I believe it should be initialized with
GB_SERIAL_AUTO_RTSCTS_EN enabled if the termios c_cflag is CRTSCTS
enabled.

Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/staging/greybus/uart.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/staging/greybus/uart.c b/drivers/staging/greybus/uart.c
index 248ad66..b542f67 100644
--- a/drivers/staging/greybus/uart.c
+++ b/drivers/staging/greybus/uart.c
@@ -506,6 +506,8 @@ static void gb_tty_set_termios(struct tty_struct *tty,
 	newline.parity = termios->c_cflag & PARENB ?
 				(termios->c_cflag & PARODD ? 1 : 2) +
 				(termios->c_cflag & CMSPAR ? 2 : 0) : 0;
+	newline.flow_control = termios->c_cflag & CRTSCTS ?
+				GB_SERIAL_AUTO_RTSCTS_EN : 0;
 
 	switch (termios->c_cflag & CSIZE) {
 	case CS5:
-- 
2.10.2