linux-kernel - Re: [PATCH] of: overlay: fix memory leak of ovcs on error exit path

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Date:   Thu, 30 Nov 2017 07:14:45 -0500
From:   Frank Rowand <frowand.list@...il.com>
To:     Colin King <colin.king@...onical.com>,
        Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] of: overlay: fix memory leak of ovcs on error exit path

On 11/29/17 14:17, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Currently if the call to of_resolve_phandles fails then then ovcs
> is not kfree'd on the error exit path.  Rather than try and make
> the clean up exit path more convoluted, fix this by just kfree'ing
> ovcs at the point of error detection and exit via the same exit
> path.
> 
> Detected by CoverityScan, CID#1462296 ("Resource Leak")
> 
> Fixes: f948d6d8b792 ("of: overlay: avoid race condition between applying multiple overlays")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  drivers/of/overlay.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/of/overlay.c b/drivers/of/overlay.c
> index 53bc9e3f0b98..6c8efe7d8cbb 100644
> --- a/drivers/of/overlay.c
> +++ b/drivers/of/overlay.c
> @@ -708,8 +708,10 @@ int of_overlay_apply(struct device_node *tree, int *ovcs_id)
>  	of_overlay_mutex_lock();
>  
>  	ret = of_resolve_phandles(tree);
> -	if (ret)
> +	if (ret) {
> +		kfree(ovcs);
>  		goto err_overlay_unlock;
> +	}
>  
>  	mutex_lock(&of_mutex);
>  
> 

False coverity warning.  ovcs is freed in free_overlay_changeset().