linux-kernel - Re: [PATCH v2 1/4] net: airoha: Fix an error handling path in airoha_alloc_gdm

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Message-ID: <aBzOaiU6Ac3ZTU-4@lore-desk>
Date: Thu, 8 May 2025 17:31:54 +0200
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org, netdev@...r.kernel.org
Subject: Re: [PATCH v2 1/4] net: airoha: Fix an error handling path in
 airoha_alloc_gdm_port()

> If register_netdev() fails, the error handling path of the probe will not
> free the memory allocated by the previous airoha_metadata_dst_alloc() call
> because port->dev->reg_state will not be NETREG_REGISTERED.
> 
> So, an explicit airoha_metadata_dst_free() call is needed in this case to
> avoid a memory leak.
> 
> Fixes: af3cf757d5c9 ("net: airoha: Move DSA tag in DMA descriptor")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
> Changes in v2:
>   - New patch
> 
> Compile tested only.
> ---
>  drivers/net/ethernet/airoha/airoha_eth.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/airoha/airoha_eth.c b/drivers/net/ethernet/airoha/airoha_eth.c
> index 16c7896f931f..af8c4015938c 100644
> --- a/drivers/net/ethernet/airoha/airoha_eth.c
> +++ b/drivers/net/ethernet/airoha/airoha_eth.c
> @@ -2873,7 +2873,15 @@ static int airoha_alloc_gdm_port(struct airoha_eth *eth,
>  	if (err)
>  		return err;
>  
> -	return register_netdev(dev);
> +	err = register_netdev(dev);
> +	if (err)
> +		goto free_metadata_dst;
> +
> +	return 0;
> +
> +free_metadata_dst:
> +	airoha_metadata_dst_free(port);
> +	return err;
>  }
>  
>  static int airoha_probe(struct platform_device *pdev)
> -- 
> 2.49.0
> 

I have not tested it but I think the right fix here would be something like:

diff --git a/drivers/net/ethernet/airoha/airoha_eth.c b/drivers/net/ethernet/airoha/airoha_eth.c
index b1ca8322d4eb..33f8926bba25 100644
--- a/drivers/net/ethernet/airoha/airoha_eth.c
+++ b/drivers/net/ethernet/airoha/airoha_eth.c
@@ -2996,10 +2996,12 @@ static int airoha_probe(struct platform_device *pdev)
 	for (i = 0; i < ARRAY_SIZE(eth->ports); i++) {
 		struct airoha_gdm_port *port = eth->ports[i];
 
-		if (port && port->dev->reg_state == NETREG_REGISTERED) {
+		if (!port)
+			continue;
+
+		if (port->dev->reg_state == NETREG_REGISTERED)
 			unregister_netdev(port->dev);
-			airoha_metadata_dst_free(port);
-		}
+		airoha_metadata_dst_free(port);
 	}
 	free_netdev(eth->napi_dev);
 	platform_set_drvdata(pdev, NULL);

Regards,
Lorenzo

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