linux-kernel - [PATCH 5.14 172/172] drivers: net: mhi: fix error path in mhi_net

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Date:   Mon,  4 Oct 2021 14:53:42 +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, Daniele Palmas <dnlplm@...il.com>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Loic Poulain <loic.poulain@...aro.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 5.14 172/172] drivers: net: mhi: fix error path in mhi_net_newlink

From: Daniele Palmas <dnlplm@...il.com>

commit 4526fe74c3c5095cc55931a3a6fb4932f9e06002 upstream.

Fix double free_netdev when mhi_prepare_for_transfer fails.

Fixes: 3ffec6a14f24 ("net: Add mhi-net driver")
Signed-off-by: Daniele Palmas <dnlplm@...il.com>
Reviewed-by: Manivannan Sadhasivam <mani@...nel.org>
Reviewed-by: Loic Poulain <loic.poulain@...aro.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/mhi/net.c |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

--- a/drivers/net/mhi/net.c
+++ b/drivers/net/mhi/net.c
@@ -337,7 +337,7 @@ static int mhi_net_newlink(void *ctxt, s
 	/* Start MHI channels */
 	err = mhi_prepare_for_transfer(mhi_dev);
 	if (err)
-		goto out_err;
+		return err;
 
 	/* Number of transfer descriptors determines size of the queue */
 	mhi_netdev->rx_queue_sz = mhi_get_free_desc_count(mhi_dev, DMA_FROM_DEVICE);
@@ -347,7 +347,7 @@ static int mhi_net_newlink(void *ctxt, s
 	else
 		err = register_netdev(ndev);
 	if (err)
-		goto out_err;
+		return err;
 
 	if (mhi_netdev->proto) {
 		err = mhi_netdev->proto->init(mhi_netdev);
@@ -359,8 +359,6 @@ static int mhi_net_newlink(void *ctxt, s
 
 out_err_proto:
 	unregister_netdevice(ndev);
-out_err:
-	free_netdev(ndev);
 	return err;
 }