linux-kernel - [PATCH] staging: greybus: Fix uninitialized scalar variable

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Message-Id: <20200510101426.23631-1-oscar.carter@gmx.com>
Date:   Sun, 10 May 2020 12:14:26 +0200
From:   Oscar Carter <oscar.carter@....com>
To:     David Lin <dtwlin@...il.com>, Johan Hovold <johan@...nel.org>,
        Alex Elder <elder@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Axel Haslam <ahaslam@...libre.com>, greybus-dev@...ts.linaro.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        Oscar Carter <oscar.carter@....com>
Subject: [PATCH] staging: greybus: Fix uninitialized scalar variable

In the "gb_tty_set_termios" function the "newline" variable is declared
but not initialized. So the "flow_control" member is not initialized and
the OR / AND operations with itself results in an undefined value in
this member.

The purpose of the code is to set the flow control type, so remove the
OR / AND self operator and set the value directly.

Addresses-Coverity-ID: 1374016 ("Uninitialized scalar variable")
Fixes: e55c25206d5c9 ("greybus: uart: Handle CRTSCTS flag in termios")
Signed-off-by: Oscar Carter <oscar.carter@....com>
---
 drivers/staging/greybus/uart.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/greybus/uart.c b/drivers/staging/greybus/uart.c
index 55c51143bb09..4ffb334cd5cd 100644
--- a/drivers/staging/greybus/uart.c
+++ b/drivers/staging/greybus/uart.c
@@ -537,9 +537,9 @@ static void gb_tty_set_termios(struct tty_struct *tty,
 	}

 	if (C_CRTSCTS(tty) && C_BAUD(tty) != B0)
-		newline.flow_control |= GB_SERIAL_AUTO_RTSCTS_EN;
+		newline.flow_control = GB_SERIAL_AUTO_RTSCTS_EN;
 	else
-		newline.flow_control &= ~GB_SERIAL_AUTO_RTSCTS_EN;
+		newline.flow_control = 0;

 	if (memcmp(&gb_tty->line_coding, &newline, sizeof(newline))) {
 		memcpy(&gb_tty->line_coding, &newline, sizeof(newline));
--
2.20.1