linux-kernel - Re: [PATCH v2] rapidio: replace rio_free_net() with kfree() in rio_scan_alloc

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Message-Id: <20260121131201.488ea7fa63f576f22db026b6@linux-foundation.org>
Date: Wed, 21 Jan 2026 13:12:01 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: Haoxiang Li <lihaoxiang@...c.iscas.ac.cn>
Cc: mporter@...nel.crashing.org, alex.bou9@...il.com,
 linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v2] rapidio: replace rio_free_net() with kfree() in
 rio_scan_alloc_net()

On Wed, 21 Jan 2026 09:35:08 +0800 Haoxiang Li <lihaoxiang@...c.iscas.ac.cn> wrote:

> When idtab allocation fails, net is not registered with rio_add_net()
> yet, so kfree(net) is sufficient to release the memory.
> Set mport->net to NULL to avoid dangling pointer.
> 
> ...
>
> --- a/drivers/rapidio/rio-scan.c
> +++ b/drivers/rapidio/rio-scan.c
> @@ -854,7 +854,8 @@ static struct rio_net *rio_scan_alloc_net(struct rio_mport *mport,
>  
>  		if (idtab == NULL) {
>  			pr_err("RIO: failed to allocate destID table\n");
> -			rio_free_net(net);
> +			kfree(net);
> +			mport->net = NULL;

Sure.  Might not have any effect, but it's defensive.

>  			net = NULL;
>  		} else {
>  			net->enum_data = idtab;

I'll add this to the 6.20(?)-rcX queue soon, unless someone stops me.