linux-kernel - [PATCH 4.9 05/65] NFC: fdp: fix incorrect free object

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Date:   Mon, 11 Nov 2019 19:28:05 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Pan Bian <bianpan2016@....com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.9 05/65] NFC: fdp: fix incorrect free object

From: Pan Bian <bianpan2016@....com>

[ Upstream commit 517ce4e93368938b204451285e53014549804868 ]

The address of fw_vsc_cfg is on stack. Releasing it with devm_kfree() is
incorrect, which may result in a system crash or other security impacts.
The expected object to free is *fw_vsc_cfg.

Signed-off-by: Pan Bian <bianpan2016@....com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/nfc/fdp/i2c.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/nfc/fdp/i2c.c
+++ b/drivers/nfc/fdp/i2c.c
@@ -268,7 +268,7 @@ static void fdp_nci_i2c_read_device_prop
 						  *fw_vsc_cfg, len);
 
 		if (r) {
-			devm_kfree(dev, fw_vsc_cfg);
+			devm_kfree(dev, *fw_vsc_cfg);
 			goto vsc_read_err;
 		}
 	} else {