On Thu, Dec 8, 2022 at 10:05 AM Cindy Lu <lulu@xxxxxxxxxx> wrote:
>
> On Wed, 7 Dec 2022 at 19:23, Nanyong Sun <sunnanyong@xxxxxxxxxx> wrote:
> >
> > From: Rong Wang <wangrong68@xxxxxxxxxx>
> >
> > In vp_vdpa_remove(), the code kfree(&vp_vdpa_mgtdev->mgtdev.id_table) uses
> > a reference of pointer as the argument of kfree, which is the wrong pointer
> > and then may hit crash like this:
> >
> > Unable to handle kernel paging request at virtual address 00ffff003363e30c
> > Internal error: Oops: 96000004 [#1] SMP
> > Call trace:
> > rb_next+0x20/0x5c
> > ext4_readdir+0x494/0x5c4 [ext4]
> > iterate_dir+0x168/0x1b4
> > __se_sys_getdents64+0x68/0x170
> > __arm64_sys_getdents64+0x24/0x30
> > el0_svc_common.constprop.0+0x7c/0x1bc
> > do_el0_svc+0x2c/0x94
> > el0_svc+0x20/0x30
> > el0_sync_handler+0xb0/0xb4
> > el0_sync+0x160/0x180
> > Code: 54000220 f9400441 b4000161 aa0103e0 (f9400821)
> > SMP: stopping secondary CPUs
> > Starting crashdump kernel...
> >
> > Fixes: ffbda8e9df10 ("vdpa/vp_vdpa : add vdpa tool support in vp_vdpa")
> > Signed-off-by: Rong Wang <wangrong68@xxxxxxxxxx>
> > Signed-off-by: Nanyong Sun <sunnanyong@xxxxxxxxxx>
> > ---
> > drivers/vdpa/virtio_pci/vp_vdpa.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/vdpa/virtio_pci/vp_vdpa.c b/drivers/vdpa/virtio_pci/vp_vdpa.c
> > index d448db0c4de3..8fe267ca3e76 100644
> > --- a/drivers/vdpa/virtio_pci/vp_vdpa.c
> > +++ b/drivers/vdpa/virtio_pci/vp_vdpa.c
> > @@ -647,7 +647,7 @@ static void vp_vdpa_remove(struct pci_dev *pdev)
> > mdev = vp_vdpa_mgtdev->mdev;
> > vp_modern_remove(mdev);
> > vdpa_mgmtdev_unregister(&vp_vdpa_mgtdev->mgtdev);
> > - kfree(&vp_vdpa_mgtdev->mgtdev.id_table);
> > + kfree(vp_vdpa_mgtdev->mgtdev.id_table);
> > kfree(mdev);
> > kfree(vp_vdpa_mgtdev);
> > }
> > --
> > 2.25.1
> >
> Reviewed-by: Cindy Lu <lulu@xxxxxxxxxx>
Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
Thanks
>
_______________________________________________
Virtualization mailing list
Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx
https://lists.linuxfoundation.org/mailman/listinfo/virtualization
