[PATCH 1/2] drm/radeon: Fix PCI device refcount leak in radeon_atrm_get_bios()

[Alex Deucher]

On Tue, Nov 22, 2022 at 6:12 AM Xiongfeng Wang
<wangxiongfeng2 at huawei.com> wrote:
>
> As comment of pci_get_class() says, it returns a pci_device with its
> refcount increased and decreased the refcount for the input parameter
> @from if it is not NULL.
>
> If we break the loop in radeon_atrm_get_bios() with 'pdev' not NULL, we
> need to call pci_dev_put() to decrease the refcount. Add the missing
> pci_dev_put() to avoid refcount leak.

For both patches, I think pci_dev_put() needs to go into the loops.
There are 2 or more GPUs on the systems where this is relevant.

Alex

>
> Fixes: d8ade3526b2a ("drm/radeon: handle non-VGA class pci devices with ATRM")
> Fixes: c61e2775873f ("drm/radeon: split ATRM support out from the ATPX handler (v3)")
> Signed-off-by: Xiongfeng Wang <wangxiongfeng2 at huawei.com>
> ---
>  drivers/gpu/drm/radeon/radeon_bios.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpu/drm/radeon/radeon_bios.c b/drivers/gpu/drm/radeon/radeon_bios.c
> index 33121655d50b..2df6ce3e32cb 100644
> --- a/drivers/gpu/drm/radeon/radeon_bios.c
> +++ b/drivers/gpu/drm/radeon/radeon_bios.c
> @@ -227,6 +227,7 @@ static bool radeon_atrm_get_bios(struct radeon_device *rdev)
>
>         if (!found)
>                 return false;
> +       pci_dev_put(pdev);
>
>         rdev->bios = kmalloc(size, GFP_KERNEL);
>         if (!rdev->bios) {
> --
> 2.20.1
>