linux-kernel - Re: [PATCH] dmaengine: idxd: Fix memory leak in idxd

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Message-ID: <20220916153640.qtb74i63upcncpuw@cantor>
Date:   Fri, 16 Sep 2022 08:36:40 -0700
From:   Jerry Snitselaar <jsnitsel@...hat.com>
To:     Rafael Mendonca <rafaelmendsr@...il.com>
Cc:     Fenghua Yu <fenghua.yu@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Vinod Koul <vkoul@...nel.org>, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dmaengine: idxd: Fix memory leak in idxd_alloc()

On Wed, Sep 14, 2022 at 08:08:14PM -0300, Rafael Mendonca wrote:
> If the IDA id allocation fails, then the allocated memory for the
> idxd_device struct doesn't get freed before returning NULL, which leads to
> a memleak.
> 
> Fixes: 47c16ac27d4c ("dmaengine: idxd: fix idxd conf_dev 'struct device' lifetime")
> Signed-off-by: Rafael Mendonca <rafaelmendsr@...il.com>

I think there needs to be a kfree(idxd) where it checks rc < 0 after the call to dev_set_name() as well, yes?

Regards,
Jerry

> ---
>  drivers/dma/idxd/init.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/dma/idxd/init.c b/drivers/dma/idxd/init.c
> index aa3478257ddb..fdc97519b8fb 100644
> --- a/drivers/dma/idxd/init.c
> +++ b/drivers/dma/idxd/init.c
> @@ -445,8 +445,10 @@ static struct idxd_device *idxd_alloc(struct pci_dev *pdev, struct idxd_driver_d
>  	idxd->data = data;
>  	idxd_dev_set_type(&idxd->idxd_dev, idxd->data->type);
>  	idxd->id = ida_alloc(&idxd_ida, GFP_KERNEL);
> -	if (idxd->id < 0)
> +	if (idxd->id < 0) {
> +		kfree(idxd);
>  		return NULL;
> +	}
>  
>  	device_initialize(conf_dev);
>  	conf_dev->parent = dev;
> -- 
> 2.34.1
>