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

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Message-ID: <92f29edd-9027-5950-10ac-37bbda1d583a@intel.com>
Date:   Fri, 16 Sep 2022 08:50:00 -0700
From:   Dave Jiang <dave.jiang@...el.com>
To:     Rafael Mendonca <rafaelmendsr@...il.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Vinod Koul <vkoul@...nel.org>
Cc:     dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dmaengine: idxd: Fix memory leak in idxd_alloc()


On 9/14/2022 4:08 PM, 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>

Thanks!

Reviewed-by: Dave Jiang <dave.jiang@...el.com>

> ---
>   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;