On Wed, Aug 21, 2024 at 09:18:40AM +0200, Philipp Stanner wrote: > In psnet_open_pf_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 string 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> I don't get why is this a part of a cleanup series - looks like an unrelated bugfix? > --- > drivers/vdpa/solidrun/snet_main.c | 7 +++++-- > 1 file changed, 5 insertions(+), 2 deletions(-) > > diff --git a/drivers/vdpa/solidrun/snet_main.c b/drivers/vdpa/solidrun/snet_main.c > index 99428a04068d..4d42a05d70fc 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"); > -- > 2.46.0