linux-kernel - [PATCH 3.12 116/212] tty: incorrect test of echo_buf() result for ECHO_OP

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Date:	Mon,  2 Dec 2013 11:15:07 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Roel Kluin <roel.kluin@...il.com>,
	Peter Hurley <peter@...leysoftware.com>
Subject: [PATCH 3.12 116/212] tty: incorrect test of echo_buf() result for ECHO_OP_START

3.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Roel Kluin <roel.kluin@...il.com>

commit c476f6584b0011741b4f0316f1ac4aa3a99403e1 upstream.

test echo_buf() result for ECHO_OP_START

Signed-off-by: Roel Kluin <roel.kluin@...il.com>
Acked-by: Peter Hurley <peter@...leysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/tty/n_tty.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -767,7 +767,7 @@ static size_t __process_echoes(struct tt
 	 * of echo overrun before the next commit), then discard enough
 	 * data at the tail to prevent a subsequent overrun */
 	while (ldata->echo_commit - tail >= ECHO_DISCARD_WATERMARK) {
-		if (echo_buf(ldata, tail == ECHO_OP_START)) {
+		if (echo_buf(ldata, tail) == ECHO_OP_START) {
 			if (echo_buf(ldata, tail) == ECHO_OP_ERASE_TAB)
 				tail += 3;
 			else


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