linux-kernel - Re: [PATCH 1/1] powerpc: fix a memory leak

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Message-ID: <54bf92e8-f884-1567-2149-caf638ff8f68@linux.ibm.com>
Date:   Thu, 14 Sep 2023 09:10:23 -0700
From:   Tyrel Datwyler <tyreld@...ux.ibm.com>
To:     Yuanjun Gong <ruc_gongyuanjun@....com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] powerpc: fix a memory leak

On 9/14/23 02:46, Yuanjun Gong wrote:
> When one of the methods xive_native_alloc_irq_on_chip, irq_create_mapping
> or irq_get_handler_data fails, the function will directly return without
> disposing vinst->name and vinst. Fix it.
> 
> Fixes: c20e1e299d93 ("powerpc/vas: Alloc and setup IRQ and trigger port address")
> Signed-off-by: Yuanjun Gong <ruc_gongyuanjun@....com>
> ---
>  arch/powerpc/platforms/powernv/vas.c | 14 +++++++++-----
>  1 file changed, 9 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/powerpc/platforms/powernv/vas.c b/arch/powerpc/platforms/powernv/vas.c
> index b65256a63e87..780740b478f0 100644
> --- a/arch/powerpc/platforms/powernv/vas.c
> +++ b/arch/powerpc/platforms/powernv/vas.c
> @@ -54,7 +54,7 @@ static int init_vas_instance(struct platform_device *pdev)
>  	struct xive_irq_data *xd;
>  	uint32_t chipid, hwirq;
>  	struct resource *res;
> -	int rc, cpu, vasid;
> +	int rc, cpu, vasid, ret;

You can you reuse rc for the return value in the error path instead of
introducing a new ret variable.

-Tyrel

> 
>  	rc = of_property_read_u32(dn, "ibm,vas-id", &vasid);
>  	if (rc) {
> @@ -102,6 +102,7 @@ static int init_vas_instance(struct platform_device *pdev)
>  	res = &pdev->resource[3];
>  	if (res->end > 62) {
>  		pr_err("Bad 'paste_win_id_shift' in DT, %llx\n", res->end);
> +		ret = -ENODEV
>  		goto free_vinst;
>  	}
> 
> @@ -111,21 +112,24 @@ static int init_vas_instance(struct platform_device *pdev)
>  	if (!hwirq) {
>  		pr_err("Inst%d: Unable to allocate global irq for chip %d\n",
>  				vinst->vas_id, chipid);
> -		return -ENOENT;
> +		ret = -ENOENT;
> +		goto free_vinst;
>  	}
> 
>  	vinst->virq = irq_create_mapping(NULL, hwirq);
>  	if (!vinst->virq) {
>  		pr_err("Inst%d: Unable to map global irq %d\n",
>  				vinst->vas_id, hwirq);
> -		return -EINVAL;
> +		ret = -EINVAL;
> +		goto free_vinst;
>  	}
> 
>  	xd = irq_get_handler_data(vinst->virq);
>  	if (!xd) {
>  		pr_err("Inst%d: Invalid virq %d\n",
>  				vinst->vas_id, vinst->virq);
> -		return -EINVAL;
> +		ret = -EINVAL;
> +		goto free_vinst;
>  	}
> 
>  	vinst->irq_port = xd->trig_page;
> @@ -168,7 +172,7 @@ static int init_vas_instance(struct platform_device *pdev)
>  free_vinst:
>  	kfree(vinst->name);
>  	kfree(vinst);
> -	return -ENODEV;
> +	return ret;
> 
>  }
>