linux-kernel - Re: [PATCH v2] net: dsa: sja1105: prevent leaking memory

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Date:   Wed, 18 Sep 2019 23:00:20 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Navid Emamdoost <navid.emamdoost@...il.com>, andrew@...n.ch
Cc:     emamd001@....edu, smccaman@....edu, kjlu@....edu,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v2] net: dsa: sja1105: prevent leaking memory

Hi Navid,

Thanks for the patch.

On 9/18/19 9:04 PM, Navid Emamdoost wrote:
> In sja1105_static_config_upload, in two cases memory is leaked: when
> static_config_buf_prepare_for_upload fails and when sja1105_inhibit_tx
> fails. In both cases config_buf should be released.
> 
> Fixes: 8aa9ebccae876 (avoid leaking config_buf)
> Fixes: 1a4c69406cc1c (avoid leaking config_buf)
> 

You're not supposed to add a short description of the patch here, but 
rather the commit message of the patch you're fixing.
Add this to your ~/.gitconfig:

[pretty]
	fixes = Fixes: %h (\"%s\")

And then run:
git show --pretty=fixes 8aa9ebccae87621d997707e4f25e53fddd7e30e4

Fixes: 8aa9ebccae87 ("net: dsa: Introduce driver for NXP SJA1105 5-port 
L2 switch")

git show --pretty=fixes 1a4c69406cc1c3c42bb7391c8eb544e93fe9b320

Fixes: 1a4c69406cc1 ("net: dsa: sja1105: Prevent PHY jabbering during 
switch reset")

> Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
> ---
>   drivers/net/dsa/sja1105/sja1105_spi.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/dsa/sja1105/sja1105_spi.c b/drivers/net/dsa/sja1105/sja1105_spi.c
> index 84dc603138cf..58dd37ecde17 100644
> --- a/drivers/net/dsa/sja1105/sja1105_spi.c
> +++ b/drivers/net/dsa/sja1105/sja1105_spi.c
> @@ -409,7 +409,8 @@ int sja1105_static_config_upload(struct sja1105_private *priv)
>   	rc = static_config_buf_prepare_for_upload(priv, config_buf, buf_len);
>   	if (rc < 0) {
>   		dev_err(dev, "Invalid config, cannot upload\n");
> -		return -EINVAL;
> +		rc = -EINVAL;
> +		goto out;
>   	}
>   	/* Prevent PHY jabbering during switch reset by inhibiting
>   	 * Tx on all ports and waiting for current packet to drain.
> @@ -418,7 +419,8 @@ int sja1105_static_config_upload(struct sja1105_private *priv)
>   	rc = sja1105_inhibit_tx(priv, port_bitmap, true);
>   	if (rc < 0) {
>   		dev_err(dev, "Failed to inhibit Tx on ports\n");
> -		return -ENXIO;
> +		rc = -ENXIO;
> +		goto out;
>   	}
>   	/* Wait for an eventual egress packet to finish transmission
>   	 * (reach IFG). It is guaranteed that a second one will not
> 

Regards,
-Vladimir