* [PATCH v2] net/mlx4_en: Fix an error handling path in 'mlx4_en_init_netdev()'
@ 2018-05-10 7:06 ` Christophe JAILLET
0 siblings, 0 replies; 6+ messages in thread
From: Christophe JAILLET @ 2018-05-10 7:06 UTC (permalink / raw)
To: davem, tariqt
Cc: netdev, linux-rdma, linux-kernel, kernel-janitors, Christophe JAILLET
If an error occurs, 'mlx4_en_destroy_netdev()' is called.
It then calls 'mlx4_en_free_resources()' which does the needed resources
cleanup.
So, doing some explicit kfree in the error handling path would lead to
some double kfree.
Simplify code to avoid such a case.
Fixes: 67f8b1dcb9ee ("net/mlx4_en: Refactor the XDP forwarding rings scheme")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
---
v1 -> v2 : rewrite the fix as explained by Tariq Toukan
(this 2nd version may have been posted twice, once without the
v2 tag. PLease ignore the first one)
---
drivers/net/ethernet/mellanox/mlx4/en_netdev.c | 8 +-------
1 file changed, 1 insertion(+), 7 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
index e0adac4a9a19..9670b33fc9b1 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
@@ -3324,12 +3324,11 @@ int mlx4_en_init_netdev(struct mlx4_en_dev *mdev, int port,
MAX_TX_RINGS, GFP_KERNEL);
if (!priv->tx_ring[t]) {
err = -ENOMEM;
- goto err_free_tx;
+ goto out;
}
priv->tx_cq[t] = kzalloc(sizeof(struct mlx4_en_cq *) *
MAX_TX_RINGS, GFP_KERNEL);
if (!priv->tx_cq[t]) {
- kfree(priv->tx_ring[t]);
err = -ENOMEM;
goto out;
}
@@ -3582,11 +3581,6 @@ int mlx4_en_init_netdev(struct mlx4_en_dev *mdev, int port,
return 0;
-err_free_tx:
- while (t--) {
- kfree(priv->tx_ring[t]);
- kfree(priv->tx_cq[t]);
- }
out:
mlx4_en_destroy_netdev(dev);
return err;
--
2.17.0
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH v2] net/mlx4_en: Fix an error handling path in 'mlx4_en_init_netdev()'
@ 2018-05-10 7:06 ` Christophe JAILLET
0 siblings, 0 replies; 6+ messages in thread
From: Christophe JAILLET @ 2018-05-10 7:06 UTC (permalink / raw)
To: davem, tariqt
Cc: netdev, linux-rdma, linux-kernel, kernel-janitors, Christophe JAILLET
If an error occurs, 'mlx4_en_destroy_netdev()' is called.
It then calls 'mlx4_en_free_resources()' which does the needed resources
cleanup.
So, doing some explicit kfree in the error handling path would lead to
some double kfree.
Simplify code to avoid such a case.
Fixes: 67f8b1dcb9ee ("net/mlx4_en: Refactor the XDP forwarding rings scheme")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
---
v1 -> v2 : rewrite the fix as explained by Tariq Toukan
(this 2nd version may have been posted twice, once without the
v2 tag. PLease ignore the first one)
---
drivers/net/ethernet/mellanox/mlx4/en_netdev.c | 8 +-------
1 file changed, 1 insertion(+), 7 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
index e0adac4a9a19..9670b33fc9b1 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
@@ -3324,12 +3324,11 @@ int mlx4_en_init_netdev(struct mlx4_en_dev *mdev, int port,
MAX_TX_RINGS, GFP_KERNEL);
if (!priv->tx_ring[t]) {
err = -ENOMEM;
- goto err_free_tx;
+ goto out;
}
priv->tx_cq[t] = kzalloc(sizeof(struct mlx4_en_cq *) *
MAX_TX_RINGS, GFP_KERNEL);
if (!priv->tx_cq[t]) {
- kfree(priv->tx_ring[t]);
err = -ENOMEM;
goto out;
}
@@ -3582,11 +3581,6 @@ int mlx4_en_init_netdev(struct mlx4_en_dev *mdev, int port,
return 0;
-err_free_tx:
- while (t--) {
- kfree(priv->tx_ring[t]);
- kfree(priv->tx_cq[t]);
- }
out:
mlx4_en_destroy_netdev(dev);
return err;
--
2.17.0
^ permalink raw reply related [flat|nested] 6+ messages in thread* Re: [PATCH v2] net/mlx4_en: Fix an error handling path in 'mlx4_en_init_netdev()'
2018-05-10 7:06 ` Christophe JAILLET
@ 2018-05-10 12:42 ` Tariq Toukan
-1 siblings, 0 replies; 6+ messages in thread
From: Tariq Toukan @ 2018-05-10 12:42 UTC (permalink / raw)
To: Christophe JAILLET, davem, tariqt
Cc: netdev, linux-rdma, linux-kernel, kernel-janitors
On 10/05/2018 10:06 AM, Christophe JAILLET wrote:
> If an error occurs, 'mlx4_en_destroy_netdev()' is called.
> It then calls 'mlx4_en_free_resources()' which does the needed resources
> cleanup.
>
> So, doing some explicit kfree in the error handling path would lead to
> some double kfree.
>
> Simplify code to avoid such a case.
>
> Fixes: 67f8b1dcb9ee ("net/mlx4_en: Refactor the XDP forwarding rings scheme")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
> ---
> v1 -> v2 : rewrite the fix as explained by Tariq Toukan
> (this 2nd version may have been posted twice, once without the
> v2 tag. PLease ignore the first one)
> ---
>
> drivers/net/ethernet/mellanox/mlx4/en_netdev.c | 8 +-------
> 1 file changed, 1 insertion(+), 7 deletions(-)
>
> diff --git a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
> index e0adac4a9a19..9670b33fc9b1 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
> @@ -3324,12 +3324,11 @@ int mlx4_en_init_netdev(struct mlx4_en_dev *mdev, int port,
> MAX_TX_RINGS, GFP_KERNEL);
> if (!priv->tx_ring[t]) {
> err = -ENOMEM;
> - goto err_free_tx;
> + goto out;
> }
> priv->tx_cq[t] = kzalloc(sizeof(struct mlx4_en_cq *) *
> MAX_TX_RINGS, GFP_KERNEL);
> if (!priv->tx_cq[t]) {
> - kfree(priv->tx_ring[t]);
> err = -ENOMEM;
> goto out;
> }
> @@ -3582,11 +3581,6 @@ int mlx4_en_init_netdev(struct mlx4_en_dev *mdev, int port,
>
> return 0;
>
> -err_free_tx:
> - while (t--) {
> - kfree(priv->tx_ring[t]);
> - kfree(priv->tx_cq[t]);
> - }
> out:
> mlx4_en_destroy_netdev(dev);
> return err;
>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Thanks Christophe.
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH v2] net/mlx4_en: Fix an error handling path in 'mlx4_en_init_netdev()'
@ 2018-05-10 12:42 ` Tariq Toukan
0 siblings, 0 replies; 6+ messages in thread
From: Tariq Toukan @ 2018-05-10 12:42 UTC (permalink / raw)
To: Christophe JAILLET, davem, tariqt
Cc: netdev, linux-rdma, linux-kernel, kernel-janitors
On 10/05/2018 10:06 AM, Christophe JAILLET wrote:
> If an error occurs, 'mlx4_en_destroy_netdev()' is called.
> It then calls 'mlx4_en_free_resources()' which does the needed resources
> cleanup.
>
> So, doing some explicit kfree in the error handling path would lead to
> some double kfree.
>
> Simplify code to avoid such a case.
>
> Fixes: 67f8b1dcb9ee ("net/mlx4_en: Refactor the XDP forwarding rings scheme")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
> ---
> v1 -> v2 : rewrite the fix as explained by Tariq Toukan
> (this 2nd version may have been posted twice, once without the
> v2 tag. PLease ignore the first one)
> ---
>
> drivers/net/ethernet/mellanox/mlx4/en_netdev.c | 8 +-------
> 1 file changed, 1 insertion(+), 7 deletions(-)
>
> diff --git a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
> index e0adac4a9a19..9670b33fc9b1 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
> @@ -3324,12 +3324,11 @@ int mlx4_en_init_netdev(struct mlx4_en_dev *mdev, int port,
> MAX_TX_RINGS, GFP_KERNEL);
> if (!priv->tx_ring[t]) {
> err = -ENOMEM;
> - goto err_free_tx;
> + goto out;
> }
> priv->tx_cq[t] = kzalloc(sizeof(struct mlx4_en_cq *) *
> MAX_TX_RINGS, GFP_KERNEL);
> if (!priv->tx_cq[t]) {
> - kfree(priv->tx_ring[t]);
> err = -ENOMEM;
> goto out;
> }
> @@ -3582,11 +3581,6 @@ int mlx4_en_init_netdev(struct mlx4_en_dev *mdev, int port,
>
> return 0;
>
> -err_free_tx:
> - while (t--) {
> - kfree(priv->tx_ring[t]);
> - kfree(priv->tx_cq[t]);
> - }
> out:
> mlx4_en_destroy_netdev(dev);
> return err;
>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Thanks Christophe.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v2] net/mlx4_en: Fix an error handling path in 'mlx4_en_init_netdev()'
2018-05-10 7:06 ` Christophe JAILLET
@ 2018-05-10 21:47 ` David Miller
-1 siblings, 0 replies; 6+ messages in thread
From: David Miller @ 2018-05-10 21:47 UTC (permalink / raw)
To: christophe.jaillet
Cc: tariqt, netdev, linux-rdma, linux-kernel, kernel-janitors
From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Date: Thu, 10 May 2018 09:06:04 +0200
> If an error occurs, 'mlx4_en_destroy_netdev()' is called.
> It then calls 'mlx4_en_free_resources()' which does the needed resources
> cleanup.
>
> So, doing some explicit kfree in the error handling path would lead to
> some double kfree.
>
> Simplify code to avoid such a case.
>
> Fixes: 67f8b1dcb9ee ("net/mlx4_en: Refactor the XDP forwarding rings scheme")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Applied and queued up for -stable, thanks.
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH v2] net/mlx4_en: Fix an error handling path in 'mlx4_en_init_netdev()'
@ 2018-05-10 21:47 ` David Miller
0 siblings, 0 replies; 6+ messages in thread
From: David Miller @ 2018-05-10 21:47 UTC (permalink / raw)
To: christophe.jaillet
Cc: tariqt, netdev, linux-rdma, linux-kernel, kernel-janitors
From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Date: Thu, 10 May 2018 09:06:04 +0200
> If an error occurs, 'mlx4_en_destroy_netdev()' is called.
> It then calls 'mlx4_en_free_resources()' which does the needed resources
> cleanup.
>
> So, doing some explicit kfree in the error handling path would lead to
> some double kfree.
>
> Simplify code to avoid such a case.
>
> Fixes: 67f8b1dcb9ee ("net/mlx4_en: Refactor the XDP forwarding rings scheme")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Applied and queued up for -stable, thanks.
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2018-05-10 21:47 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2018-05-10 7:06 [PATCH v2] net/mlx4_en: Fix an error handling path in 'mlx4_en_init_netdev()' Christophe JAILLET
2018-05-10 7:06 ` Christophe JAILLET
2018-05-10 12:42 ` Tariq Toukan
2018-05-10 12:42 ` Tariq Toukan
2018-05-10 21:47 ` David Miller
2018-05-10 21:47 ` David Miller
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