linux-kernel - Re: [PATCH] mm/gup: Fix memory leak in __gup_benchmark

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Date:   Thu, 12 Dec 2019 15:14:56 -0800
From:   Ira Weiny <ira.weiny@...el.com>
To:     Navid Emamdoost <navid.emamdoost@...il.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Keith Busch <keith.busch@...el.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, emamd001@....edu
Subject: Re: [PATCH] mm/gup: Fix memory leak in __gup_benchmark_ioctl

On Wed, Dec 11, 2019 at 11:46:51AM -0600, Navid Emamdoost wrote:
> In the implementation of __gup_benchmark_ioctl() the allocated pages
> should be released before returning in case of an invalid cmd. Release
> pages via kvfree().
> 
> Fixes: 714a3a1ebafe ("mm/gup_benchmark.c: add additional pinning methods")
> Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
> ---
>  mm/gup_benchmark.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/mm/gup_benchmark.c b/mm/gup_benchmark.c
> index 7dd602d7f8db..b160638f647e 100644
> --- a/mm/gup_benchmark.c
> +++ b/mm/gup_benchmark.c
> @@ -63,6 +63,7 @@ static int __gup_benchmark_ioctl(unsigned int cmd,
>  					    NULL);
>  			break;
>  		default:
> +			kvfree(pages);

I wonder if adding a ret value and a goto where the free is done would be
better.  But may be overkill at this time.  So...

Reviewed-by: Ira Weiny <ira.weiny@...el.com>

>  			return -1;
>  		}
>  
> -- 
> 2.17.1
>