linux-kernel - [PATCH AUTOSEL 4.9 06/26] tty: serial: 8250: serial_cs: Fix a memory leak in error handling path

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Message-Id: <20210710023604.3172486-6-sashal@kernel.org>
Date:   Fri,  9 Jul 2021 22:35:44 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>, linux-serial@...r.kernel.org
Subject: [PATCH AUTOSEL 4.9 06/26] tty: serial: 8250: serial_cs: Fix a memory leak in error handling path

From: Christophe JAILLET <christophe.jaillet@...adoo.fr>

[ Upstream commit fad92b11047a748c996ebd6cfb164a63814eeb2e ]

In the probe function, if the final 'serial_config()' fails, 'info' is
leaking.

Add a resource handling path to free this memory.

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Link: https://lore.kernel.org/r/dc25f96b7faebf42e60fe8d02963c941cf4d8124.1621971720.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/tty/serial/8250/serial_cs.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/8250/serial_cs.c b/drivers/tty/serial/8250/serial_cs.c
index 8106353ce7aa..38e8045a36cc 100644
--- a/drivers/tty/serial/8250/serial_cs.c
+++ b/drivers/tty/serial/8250/serial_cs.c
@@ -305,6 +305,7 @@ static int serial_resume(struct pcmcia_device *link)
 static int serial_probe(struct pcmcia_device *link)
 {
 	struct serial_info *info;
+	int ret;
 
 	dev_dbg(&link->dev, "serial_attach()\n");
 
@@ -319,7 +320,15 @@ static int serial_probe(struct pcmcia_device *link)
 	if (do_sound)
 		link->config_flags |= CONF_ENABLE_SPKR;
 
-	return serial_config(link);
+	ret = serial_config(link);
+	if (ret)
+		goto free_info;
+
+	return 0;
+
+free_info:
+	kfree(info);
+	return ret;
 }
 
 static void serial_detach(struct pcmcia_device *link)
-- 
2.30.2