linux-kernel - Re: [PATCH] vfio/pds: Potential memory leak in pds_vfio_dirty

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Date: Tue, 23 Jan 2024 09:52:51 -0800
From: Brett Creeley <bcreeley@....com>
To: Cong Liu <liucong2@...inos.cn>, Brett Creeley <brett.creeley@....com>,
 Jason Gunthorpe <jgg@...pe.ca>, Yishai Hadas <yishaih@...dia.com>,
 Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>,
 Kevin Tian <kevin.tian@...el.com>,
 Alex Williamson <alex.williamson@...hat.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vfio/pds: Potential memory leak in
 pds_vfio_dirty_enable()

On 1/22/2024 5:13 PM, Cong Liu wrote:
> Caution: This message originated from an External Source. Use proper caution when opening attachments, clicking links, or responding.
> 
> 
> the patch releases the region_info memory if the interval_tree_iter_first()
> function fails.
> 
> Signed-off-by: Cong Liu <liucong2@...inos.cn>
> ---
>   drivers/vfio/pci/pds/dirty.c | 7 +++++--
>   1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/vfio/pci/pds/dirty.c b/drivers/vfio/pci/pds/dirty.c
> index 8ddf4346fcd5..67919b5db127 100644
> --- a/drivers/vfio/pci/pds/dirty.c
> +++ b/drivers/vfio/pci/pds/dirty.c
> @@ -291,8 +291,11 @@ static int pds_vfio_dirty_enable(struct pds_vfio_pci_device *pds_vfio,
>          len = num_ranges * sizeof(*region_info);
> 
>          node = interval_tree_iter_first(ranges, 0, ULONG_MAX);
> -       if (!node)
> -               return -EINVAL;
> +       if (!node) {
> +               err = -EINVAL;
> +               goto out_free_region_info;
> +       }
> +

LGTM! Thanks for fixing this.

Reviewed-by: <brett.creeley@....com>

>          for (int i = 0; i < num_ranges; i++) {
>                  struct pds_lm_dirty_region_info *ri = &region_info[i];
>                  u64 region_size = node->last - node->start + 1;
> --
> 2.34.1
>