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SubjectRe: [PATCH v2] mm/gup: Fix memory leak in __gup_benchmark_ioctl
On Fri, Dec 13, 2019 at 04:37:41PM -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() by goto done.
>
> Fixes: 714a3a1ebafe ("mm/gup_benchmark.c: add additional pinning methods")
> Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com>

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

> ---
> Changes in v2:
> -- added goto and ret value instead of return -1.
> ---
> mm/gup_benchmark.c | 9 +++++----
> 1 file changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/mm/gup_benchmark.c b/mm/gup_benchmark.c
> index b160638f647e..b773b2568544 100644
> --- a/mm/gup_benchmark.c
> +++ b/mm/gup_benchmark.c
> @@ -24,7 +24,7 @@ static int __gup_benchmark_ioctl(unsigned int cmd,
> {
> ktime_t start_time, end_time;
> unsigned long i, nr_pages, addr, next;
> - int nr;
> + int nr, ret = 0;
> struct page **pages;
>
> if (gup->size > ULONG_MAX)
> @@ -63,8 +63,8 @@ static int __gup_benchmark_ioctl(unsigned int cmd,
> NULL);
> break;
> default:
> - kvfree(pages);
> - return -1;
> + ret = -EINVAL;
> + goto done;
> }
>
> if (nr <= 0)
> @@ -85,8 +85,9 @@ static int __gup_benchmark_ioctl(unsigned int cmd,
> end_time = ktime_get();
> gup->put_delta_usec = ktime_us_delta(end_time, start_time);
>
> +done:
> kvfree(pages);
> - return 0;
> + return ret;
> }
>
> static long gup_benchmark_ioctl(struct file *filep, unsigned int cmd,
> --
> 2.17.1
>
>

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