linux-kernel - RE: [PATCH] fpga: dfl: add missing platform_device_put in build_info_create

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Date:   Wed, 25 Nov 2020 10:06:10 +0000
From:   "Wu, Hao" <hao.wu@...el.com>
To:     Qinglang Miao <miaoqinglang@...wei.com>, Tom Rix <trix@...hat.com>,
        "Moritz Fischer" <mdf@...nel.org>
CC:     "linux-fpga@...r.kernel.org" <linux-fpga@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] fpga: dfl: add missing platform_device_put in
 build_info_create_dev

> Subject: [PATCH] fpga: dfl: add missing platform_device_put in
> build_info_create_dev
> 
> platform_device_put is missing when it fails to set fdev->id. Set
> a temp value to do sanity check.

will this case be covered already by build_info_free()?

Hao

> 
> Fixes: 543be3d8c999 ("fpga: add device feature list support")
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Qinglang Miao <miaoqinglang@...wei.com>
> ---
>  drivers/fpga/dfl.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/fpga/dfl.c b/drivers/fpga/dfl.c
> index b450870b7..8958f0860 100644
> --- a/drivers/fpga/dfl.c
> +++ b/drivers/fpga/dfl.c
> @@ -877,10 +877,13 @@ build_info_create_dev(struct
> build_feature_devs_info *binfo,
> 
>  	INIT_LIST_HEAD(&binfo->sub_features);
> 
> -	fdev->id = dfl_id_alloc(type, &fdev->dev);
> -	if (fdev->id < 0)
> -		return fdev->id;
> +	int tmp_id = dfl_id_alloc(type, &fdev->dev);
> +	if (tmp_id < 0) {
> +		platform_device_put(fdev);
> +		return tmp_id;
> +	}
> 
> +	fdev->id = tmp_id;
>  	fdev->dev.parent = &binfo->cdev->region->dev;
>  	fdev->dev.devt = dfl_get_devt(dfl_devs[type].devt_type, fdev->id);
> 
> --
> 2.23.0