linux-kernel - [PATCH v2] fsi: Aspeed: Fix a potential double free

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Date:   Sun,  9 Jan 2022 14:20:35 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Jeremy Kerr <jk@...abs.org>, Joel Stanley <joel@....id.au>,
        Alistar Popple <alistair@...ple.id.au>,
        Eddie James <eajames@...ux.ibm.com>,
        Andrew Jeffery <andrew@...id.au>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Guenter Roeck <linux@...ck-us.net>, linux-fsi@...ts.ozlabs.org,
        linux-arm-kernel@...ts.infradead.org, linux-aspeed@...ts.ozlabs.org
Subject: [PATCH v2] fsi: Aspeed: Fix a potential double free

A struct device can never be devm_alloc()'ed.
Here, it is embedded in "struct fsi_master", and "struct fsi_master" is
embedded in "struct fsi_master_aspeed".

Since "struct device" is embedded, the data structure embedding it must be
released with the release function, as is already done here.

So use kzalloc() instead of devm_kzalloc() when allocating "aspeed".
This prevent a potential double free().

Fixes: 606397d67f41 ("fsi: Add ast2600 master driver")
Suggested-by: Greg KH <gregkh@...uxfoundation.org>
Suggested-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
v2: Keep the release function which is correct
    s/devm_kzalloc()/kzalloc()/ instead
---
 drivers/fsi/fsi-master-aspeed.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/fsi/fsi-master-aspeed.c b/drivers/fsi/fsi-master-aspeed.c
index 8606e55c1721..ae6319818b14 100644
--- a/drivers/fsi/fsi-master-aspeed.c
+++ b/drivers/fsi/fsi-master-aspeed.c
@@ -542,7 +542,7 @@ static int fsi_master_aspeed_probe(struct platform_device *pdev)
 		return rc;
 	}
 
-	aspeed = devm_kzalloc(&pdev->dev, sizeof(*aspeed), GFP_KERNEL);
+	aspeed = kzalloc(sizeof(*aspeed), GFP_KERNEL);
 	if (!aspeed)
 		return -ENOMEM;
 
-- 
2.32.0