On Thu, 2024-08-22 at 16:34 +0200, Christophe JAILLET wrote:
> Le 22/08/2024 à 15:47, Philipp Stanner a écrit :
> > In psnet_open_pf_bar() and snet_open_vf_bar() a string later passed
> > to
> > pcim_iomap_regions() is placed on the stack. Neither
> > pcim_iomap_regions() nor the functions it calls copy that string.
> >
> > Should the string later ever be used, this, consequently, causes
> > undefined behavior since the stack frame will by then have
> > disappeared.
> >
> > Fix the bug by allocating the strings on the heap through
> > devm_kasprintf().
> >
> > Cc: stable@xxxxxxxxxxxxxxx # v6.3
> > Fixes: 51a8f9d7f587 ("virtio: vdpa: new SolidNET DPU driver.")
> > Reported-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
> > Closes:
> > https://lore.kernel.org/all/74e9109a-ac59-49e2-9b1d-d825c9c9f891@xxxxxxxxxx/
> > Suggested-by: Andy Shevchenko <andy@xxxxxxxxxx>
> > Signed-off-by: Philipp Stanner <pstanner@xxxxxxxxxx>
> > ---
> > drivers/vdpa/solidrun/snet_main.c | 13 +++++++++----
> > 1 file changed, 9 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/vdpa/solidrun/snet_main.c
> > b/drivers/vdpa/solidrun/snet_main.c
> > index 99428a04068d..67235f6190ef 100644
> > --- a/drivers/vdpa/solidrun/snet_main.c
> > +++ b/drivers/vdpa/solidrun/snet_main.c
> > @@ -555,7 +555,7 @@ static const struct vdpa_config_ops
> > snet_config_ops = {
> >
> > static int psnet_open_pf_bar(struct pci_dev *pdev, struct psnet
> > *psnet)
> > {
> > - char name[50];
> > + char *name;
> > int ret, i, mask = 0;
> > /* We don't know which BAR will be used to communicate..
> > * We will map every bar with len > 0.
> > @@ -573,7 +573,10 @@ static int psnet_open_pf_bar(struct pci_dev
> > *pdev, struct psnet *psnet)
> > return -ENODEV;
> > }
> >
> > - snprintf(name, sizeof(name), "psnet[%s]-bars",
> > pci_name(pdev));
> > + name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "psnet[%s]-
> > bars", pci_name(pdev));
> > + if (!name)
> > + return -ENOMEM;
> > +
> > ret = pcim_iomap_regions(pdev, mask, name);
> > if (ret) {
> > SNET_ERR(pdev, "Failed to request and map PCI
> > BARs\n");
> > @@ -590,10 +593,12 @@ static int psnet_open_pf_bar(struct pci_dev
> > *pdev, struct psnet *psnet)
> >
> > static int snet_open_vf_bar(struct pci_dev *pdev, struct snet
> > *snet)
> > {
> > - char name[50];
> > + char *name;
> > int ret;
> >
> > - snprintf(name, sizeof(name), "snet[%s]-bar",
> > pci_name(pdev));
> > + name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "psnet[%s]-
> > bars", pci_name(pdev));
>
> s/psnet/snet/
sharp eyes ;)
Thx,
P.
>
> > + if (!name)
> > + return -ENOMEM;
> > /* Request and map BAR */
> > ret = pcim_iomap_regions(pdev, BIT(snet->psnet-
> > >cfg.vf_bar), name);
> > if (ret) {
>
