linux-kernel - tty: incorrect test of echo_buf() result for ECHO_OP

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Date:	Fri, 11 Oct 2013 22:08:49 +0200 (CEST)
From:	Roel Kluin <roel.kluin@...il.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>, linux-kernel@...r.kernel.org
Subject: tty: incorrect test of echo_buf() result for ECHO_OP_START

Untested, but this looks like a bug to me
-----------
test echo_buf() result for ECHO_OP_START

Signed-off-by: Roel Kluin <roel.kluin@...il.com>
---
diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index 7a744b6..42b6cca 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -767,7 +767,7 @@ static size_t __process_echoes(struct tty_struct *tty)
 	 * 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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