linux-kernel - [PATCH 5.18 0909/1095] watchdog: sp5100_tco: Fix a memory leak of EFCH MMIO resource

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Message-Id: <20220815180506.896913248@linuxfoundation.org>
Date:   Mon, 15 Aug 2022 20:05:08 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jean Delvare <jdelvare@...e.de>,
        Terry Bowman <terry.bowman@....com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.18 0909/1095] watchdog: sp5100_tco: Fix a memory leak of EFCH MMIO resource

From: Jean Delvare <jdelvare@...e.de>

[ Upstream commit c6d9c0798ed366a09a9e53d71edcd2266e34a6eb ]

Unlike release_mem_region(), a call to release_resource() does not
free the resource, so it has to be freed explicitly to avoid a memory
leak.

Signed-off-by: Jean Delvare <jdelvare@...e.de>
Fixes: 0578fff4aae5 ("Watchdog: sp5100_tco: Add initialization using EFCH MMIO")
Cc: Terry Bowman <terry.bowman@....com>
Cc: Wim Van Sebroeck <wim@...ux-watchdog.org>
Cc: Guenter Roeck <linux@...ck-us.net>
Reviewed-by: Guenter Roeck <linux@...ck-us.net>
Link: https://lore.kernel.org/r/20220621152840.420a0f4c@endymion.delvare
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@...ux-watchdog.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/watchdog/sp5100_tco.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/watchdog/sp5100_tco.c b/drivers/watchdog/sp5100_tco.c
index 86ffb58fbc85..ae54dd33e233 100644
--- a/drivers/watchdog/sp5100_tco.c
+++ b/drivers/watchdog/sp5100_tco.c
@@ -402,6 +402,7 @@ static int sp5100_tco_setupdevice_mmio(struct device *dev,
 		iounmap(addr);
 
 	release_resource(res);
+	kfree(res);
 
 	return ret;
 }
-- 
2.35.1