[PATCH 1/1] drivers: net: mhi: fix error path in mhi_net_newlink

Fix double free_netdev when mhi_prepare_for_transfer fails.

This is a back-port of upstream:
commit 4526fe74c3c509 ("drivers: net: mhi: fix error path in mhi_net_newlink")

Fixes: 13adac032982 ("net: mhi_net: Register wwan_ops for link creation")
Signed-off-by: Daniele Palmas <redacted>
---
Hello Greg,

if maintainers ack, this should go just to 5.14 branch.

Thanks,
Daniele
---
 drivers/net/mhi/net.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/mhi/net.c b/drivers/net/mhi/net.c
index e60e38c1f09d..5e49f7a919b6 100644
--- a/drivers/net/mhi/net.c
+++ b/drivers/net/mhi/net.c

@@ -337,7 +337,7 @@ static int mhi_net_newlink(void *ctxt, struct net_device *ndev, u32 if_id,
 	/* 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, struct net_device *ndev, u32 if_id,
 	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, struct net_device *ndev, u32 if_id,
 
 out_err_proto:
 	unregister_netdevice(ndev);
-out_err:
-	free_netdev(ndev);
 	return err;
 }
 

-- 
2.30.2

On Mon, Oct 04, 2021 at 01:46:01PM +0200, Daniele Palmas wrote:

Fix double free_netdev when mhi_prepare_for_transfer fails.

This is a back-port of upstream:
commit 4526fe74c3c509 ("drivers: net: mhi: fix error path in mhi_net_newlink")

Fixes: 13adac032982 ("net: mhi_net: Register wwan_ops for link creation")
Signed-off-by: Daniele Palmas <redacted>
---
Hello Greg,

if maintainers ack, this should go just to 5.14 branch.

Looks good to me, thanks!

greg k-h

On Mon, Oct 04, 2021 at 01:46:01PM +0200, Daniele Palmas wrote:

Fix double free_netdev when mhi_prepare_for_transfer fails.

This is a back-port of upstream:
commit 4526fe74c3c509 ("drivers: net: mhi: fix error path in mhi_net_newlink")

Fixes: 13adac032982 ("net: mhi_net: Register wwan_ops for link creation")
Signed-off-by: Daniele Palmas <redacted>

Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>

Thanks,
Mani

On Mon, Oct 4, 2021 at 2:45 PM Daniele Palmas [off-list ref] wrote:

Fix double free_netdev when mhi_prepare_for_transfer fails.

This is a back-port of upstream:
commit 4526fe74c3c509 ("drivers: net: mhi: fix error path in mhi_net_newlink")

Fixes: 13adac032982 ("net: mhi_net: Register wwan_ops for link creation")
Signed-off-by: Daniele Palmas <redacted>

Looks good for me too, thank you for taking care of this!

Acked-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>