linux-kernel - [PATCH 4.4 046/134] NFC: nfcmrvl: double free on error path

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Date:   Mon, 19 Mar 2018 19:05:29 +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, Dan Carpenter <dan.carpenter@...cle.com>,
        Samuel Ortiz <sameo@...ux.intel.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.4 046/134] NFC: nfcmrvl: double free on error path

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@...cle.com>


[ Upstream commit ca42fb9e52d155547e6cf18cf26bce3e1a6af4ea ]

The nci_spi_send() function calls kfree_skb(skb) on both error and
success so this extra kfree_skb() is a double free.

Fixes: caf6e49bf6d0 ("NFC: nfcmrvl: add spi driver")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Samuel Ortiz <sameo@...ux.intel.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/nfc/nfcmrvl/spi.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

--- a/drivers/nfc/nfcmrvl/spi.c
+++ b/drivers/nfc/nfcmrvl/spi.c
@@ -96,10 +96,9 @@ static int nfcmrvl_spi_nci_send(struct n
 	/* Send the SPI packet */
 	err = nci_spi_send(drv_data->nci_spi, &drv_data->handshake_completion,
 			   skb);
-	if (err != 0) {
+	if (err)
 		nfc_err(priv->dev, "spi_send failed %d", err);
-		kfree_skb(skb);
-	}
+
 	return err;
 }