On Tue, Mar 22, 2022 at 09:20:27AM +0000, Keir Fraser wrote:
> On Tue, Mar 22, 2022 at 11:36:23AM +0800, Jason Wang wrote:
> > On Mon, Mar 21, 2022 at 11:49 PM Keir Fraser <keirf@xxxxxxxxxx> wrote:
> > >
> > > The bar index is used as an index into the device's resource list
> > > and should be checked as within range for a standard bar.
> > >
> > > Signed-off-by: Keir Fraser <keirf@xxxxxxxxxx>
> >
> > Patch looks good, do we need a similar check in vp_modern_map_capability()?
>
> Yes it looks like we do. Would you like me to fix that also? If so: separate patch, or
> revised version of this patch?
Yes pls. A fixed version is better, less work for everyone.
> > Thanks
> >
> > > ---
> > > drivers/virtio/virtio_pci_modern.c | 10 ++++++++--
> > > 1 file changed, 8 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
> > > index 5455bc041fb6..84bace98dff5 100644
> > > --- a/drivers/virtio/virtio_pci_modern.c
> > > +++ b/drivers/virtio/virtio_pci_modern.c
> > > @@ -293,7 +293,7 @@ static int virtio_pci_find_shm_cap(struct pci_dev *dev, u8 required_id,
> > >
> > > for (pos = pci_find_capability(dev, PCI_CAP_ID_VNDR); pos > 0;
> > > pos = pci_find_next_capability(dev, pos, PCI_CAP_ID_VNDR)) {
> > > - u8 type, cap_len, id;
> > > + u8 type, cap_len, id, res_bar;
> > > u32 tmp32;
> > > u64 res_offset, res_length;
> > >
> > > @@ -317,7 +317,12 @@ static int virtio_pci_find_shm_cap(struct pci_dev *dev, u8 required_id,
> > >
> > > /* Type, and ID match, looks good */
> > > pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap,
> > > - bar), bar);
> > > + bar), &res_bar);
> > > + if (res_bar >= PCI_STD_NUM_BARS) {
> > > + dev_err(&dev->dev, "%s: shm cap with bad bar: %d\n",
> > > + __func__, res_bar);
> > > + continue;
> > > + }
> > >
> > > /* Read the lower 32bit of length and offset */
> > > pci_read_config_dword(dev, pos + offsetof(struct virtio_pci_cap,
> > > @@ -337,6 +342,7 @@ static int virtio_pci_find_shm_cap(struct pci_dev *dev, u8 required_id,
> > > length_hi), &tmp32);
> > > res_length |= ((u64)tmp32) << 32;
> > >
> > > + *bar = res_bar;
> > > *offset = res_offset;
> > > *len = res_length;
> > >
> > > --
> > > 2.35.1.894.gb6a874cedc-goog
> > >
> >
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