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SubjectRe: [PATCH][next] drm/amd/powerplay: fix various dereferences of a pointer before it is null checked
On Thu, Dec 12, 2019 at 1:17 PM Colin King <colin.king@canonical.com> wrote:
>
> From: Colin Ian King <colin.king@canonical.com>
>
> There are several occurrances of the pointer hwmgr being dereferenced
> before it is null checked. Fix these by performing the dereference
> of hwmgr after it has been null checked.
>
> Addresses-Coverity: ("Dereference before null check")
> Fixes: 8497d2bcdee1 ("drm/amd/powerplay: enable pp one vf mode for vega10")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>

Applied. thanks!

Alex

> ---
> drivers/gpu/drm/amd/powerplay/amd_powerplay.c | 6 +++---
> drivers/gpu/drm/amd/powerplay/hwmgr/hwmgr.c | 15 +++------------
> 2 files changed, 6 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/powerplay/amd_powerplay.c b/drivers/gpu/drm/amd/powerplay/amd_powerplay.c
> index 5087d6bdba60..322c2015d3a0 100644
> --- a/drivers/gpu/drm/amd/powerplay/amd_powerplay.c
> +++ b/drivers/gpu/drm/amd/powerplay/amd_powerplay.c
> @@ -275,12 +275,12 @@ static int pp_dpm_load_fw(void *handle)
> {
> struct pp_hwmgr *hwmgr = handle;
>
> - if (!hwmgr->not_vf)
> - return 0;
> -
> if (!hwmgr || !hwmgr->smumgr_funcs || !hwmgr->smumgr_funcs->start_smu)
> return -EINVAL;
>
> + if (!hwmgr->not_vf)
> + return 0;
> +
> if (hwmgr->smumgr_funcs->start_smu(hwmgr)) {
> pr_err("fw load failed\n");
> return -EINVAL;
> diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/hwmgr.c b/drivers/gpu/drm/amd/powerplay/hwmgr/hwmgr.c
> index e2b82c902948..f48fdc7f0382 100644
> --- a/drivers/gpu/drm/amd/powerplay/hwmgr/hwmgr.c
> +++ b/drivers/gpu/drm/amd/powerplay/hwmgr/hwmgr.c
> @@ -282,10 +282,7 @@ int hwmgr_hw_init(struct pp_hwmgr *hwmgr)
>
> int hwmgr_hw_fini(struct pp_hwmgr *hwmgr)
> {
> - if (!hwmgr->not_vf)
> - return 0;
> -
> - if (!hwmgr || !hwmgr->pm_en)
> + if (!hwmgr || !hwmgr->pm_en || !hwmgr->not_vf)
> return 0;
>
> phm_stop_thermal_controller(hwmgr);
> @@ -305,10 +302,7 @@ int hwmgr_suspend(struct pp_hwmgr *hwmgr)
> {
> int ret = 0;
>
> - if (!hwmgr->not_vf)
> - return 0;
> -
> - if (!hwmgr || !hwmgr->pm_en)
> + if (!hwmgr || !hwmgr->pm_en || !hwmgr->not_vf)
> return 0;
>
> phm_disable_smc_firmware_ctf(hwmgr);
> @@ -327,13 +321,10 @@ int hwmgr_resume(struct pp_hwmgr *hwmgr)
> {
> int ret = 0;
>
> - if (!hwmgr->not_vf)
> - return 0;
> -
> if (!hwmgr)
> return -EINVAL;
>
> - if (!hwmgr->pm_en)
> + if (!hwmgr->not_vf || !hwmgr->pm_en)
> return 0;
>
> ret = phm_setup_asic(hwmgr);
> --
> 2.24.0
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

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