linux-kernel - [PATCH 2/4] staging: dgap: fix memory leak caused by double allocation of tty

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Message-ID: <20141106102711.GA21460@devel>
Date:	Thu, 6 Nov 2014 19:27:11 +0900
From:	Daeseok Youn <daeseok.youn@...il.com>
To:	lidza.louina@...il.com, markh@...pro.net
Cc:	markh@...pro.net, daeseok.youn@...il.com,
	gregkh@...uxfoundation.org, driverdev-devel@...uxdriverproject.org,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/4] staging: dgap: fix memory leak caused by double
 allocation of tty_structs

The tty_struct of serial_driver and print_driver were getting
allocated twice. One is allocated in tty_alloc_driver(), the other
is in dgap_tty_register(). So remove these in dgap_tty_register().

Signed-off-by: Daeseok Youn <daeseok.youn@...il.com>
---
 drivers/staging/dgap/dgap.c |   16 ----------------
 1 files changed, 0 insertions(+), 16 deletions(-)

diff --git a/drivers/staging/dgap/dgap.c b/drivers/staging/dgap/dgap.c
index 6418cc5..688aaa4 100644
--- a/drivers/staging/dgap/dgap.c
+++ b/drivers/staging/dgap/dgap.c
@@ -5254,14 +5254,6 @@ static int dgap_tty_register(struct board_t *brd)
 	brd->serial_driver->init_termios = dgap_default_termios;
 	brd->serial_driver->driver_name = DRVSTR;
 
-	/* The kernel wants space to store pointers to tty_structs */
-	brd->serial_driver->ttys =
-		kzalloc(MAXPORTS * sizeof(struct tty_struct *), GFP_KERNEL);
-	if (!brd->serial_driver->ttys) {
-		rc = -ENOMEM;
-		goto free_serial_drv;
-	}
-
 	/*
 	 * Entry points for driver.  Called by the kernel from
 	 * tty_io.c and n_tty.c.
@@ -5293,14 +5285,6 @@ static int dgap_tty_register(struct board_t *brd)
 	brd->print_driver->init_termios = dgap_default_termios;
 	brd->print_driver->driver_name = DRVSTR;
 
-	/* The kernel wants space to store pointers to tty_structs */
-	brd->print_driver->ttys =
-		kzalloc(MAXPORTS * sizeof(struct tty_struct *), GFP_KERNEL);
-	if (!brd->print_driver->ttys) {
-		rc = -ENOMEM;
-		goto free_print_drv;
-	}
-
 	/*
 	 * Entry points for driver.  Called by the kernel from
 	 * tty_io.c and n_tty.c.
-- 
1.7.1

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