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Re: [PATCH v2] vfio: Fix memory leak of hostwin
From: |
Alex Williamson |
Subject: |
Re: [PATCH v2] vfio: Fix memory leak of hostwin |
Date: |
Wed, 17 Nov 2021 12:19:26 -0700 |
On Wed, 17 Nov 2021 09:47:39 +0800
Peng Liang <liangpeng10@huawei.com> wrote:
> hostwin is allocated and added to hostwin_list in vfio_host_win_add, but
> it is only deleted from hostwin_list in vfio_host_win_del, which causes
> a memory leak. Also, freeing all elements in hostwin_list is missing in
> vfio_disconnect_container.
>
> Fix: 2e4109de8e58 ("vfio/spapr: Create DMA window dynamically (SPAPR IOMMU
> v2)")
> CC: qemu-stable@nongnu.org
> Signed-off-by: Peng Liang <liangpeng10@huawei.com>
> ---
> v1 -> v2:
> - Don't change to _SAFE variant in vfio_host_win_del. [Alex]
> ---
> hw/vfio/common.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
Thanks, pull request sent to include this in 6.2.
Alex
>
> diff --git a/hw/vfio/common.c b/hw/vfio/common.c
> index dd387b0d3959..080046e3f511 100644
> --- a/hw/vfio/common.c
> +++ b/hw/vfio/common.c
> @@ -551,6 +551,7 @@ static int vfio_host_win_del(VFIOContainer *container,
> hwaddr min_iova,
> QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) {
> if (hostwin->min_iova == min_iova && hostwin->max_iova == max_iova) {
> QLIST_REMOVE(hostwin, hostwin_next);
> + g_free(hostwin);
> return 0;
> }
> }
> @@ -2239,6 +2240,7 @@ static void vfio_disconnect_container(VFIOGroup *group)
> if (QLIST_EMPTY(&container->group_list)) {
> VFIOAddressSpace *space = container->space;
> VFIOGuestIOMMU *giommu, *tmp;
> + VFIOHostDMAWindow *hostwin, *next;
>
> QLIST_REMOVE(container, next);
>
> @@ -2249,6 +2251,12 @@ static void vfio_disconnect_container(VFIOGroup *group)
> g_free(giommu);
> }
>
> + QLIST_FOREACH_SAFE(hostwin, &container->hostwin_list, hostwin_next,
> + next) {
> + QLIST_REMOVE(hostwin, hostwin_next);
> + g_free(hostwin);
> + }
> +
> trace_vfio_disconnect_container(container->fd);
> close(container->fd);
> g_free(container);