On Wed, 02. Oct 16:01, Igor Artemiev wrote:
> amdgpu_irq_ad_id() may fail and the irq handlers will not be registered.
> This patch adds error code check.
>
> Found by Linux Verification Center (linuxtesting.org) with static
> analysis tool SVACE.
>
> Signed-off-by: Igor Artemiev <Igor.A.Artemiev@xxxxxxx>
> ---
> v2: Remove the cast to struct amdgpu_device as Christian König
> <christian.koenig@xxxxxxx> suggested.
>
> .../drm/amd/pm/powerplay/hwmgr/smu_helper.c | 19 ++++++++++++++++---
> 1 file changed, 16 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu_helper.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu_helper.c
> index 79a566f3564a..50a3085c00aa 100644
> --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu_helper.c
> +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu_helper.c
> @@ -647,28 +647,41 @@ int smu9_register_irq_handlers(struct pp_hwmgr *hwmgr)
> {
> struct amdgpu_irq_src *source =
> kzalloc(sizeof(struct amdgpu_irq_src), GFP_KERNEL);
> + int ret;
>
> if (!source)
> return -ENOMEM;
>
> source->funcs = &smu9_irq_funcs;
>
> - amdgpu_irq_add_id((struct amdgpu_device *)(hwmgr->adev),
> + ret = amdgpu_irq_add_id(hwmgr->adev,
> SOC15_IH_CLIENTID_THM,
> THM_9_0__SRCID__THM_DIG_THERM_L2H,
> source);
> - amdgpu_irq_add_id((struct amdgpu_device *)(hwmgr->adev),
> + if (ret)
> + goto err;
> +
> + ret = amdgpu_irq_add_id(hwmgr->adev,
> SOC15_IH_CLIENTID_THM,
> THM_9_0__SRCID__THM_DIG_THERM_H2L,
> source);
> + if (ret)
> + goto err;
>
> /* Register CTF(GPIO_19) interrupt */
> - amdgpu_irq_add_id((struct amdgpu_device *)(hwmgr->adev),
> + ret = amdgpu_irq_add_id(hwmgr->adev,
> SOC15_IH_CLIENTID_ROM_SMUIO,
> SMUIO_9_0__SRCID__SMUIO_GPIO19,
> source);
> + if (ret)
> + goto err;
>
> return 0;
> +
> +err:
> + kfree(source);
Oh, the calltrace looks like:
hwmgr_sw_init()
phm_register_irq_handlers()
->register_irq_handlers()
smu9_register_irq_handlers()
And the return value of phm_register_irq_handlers() is not processed and
the error is not reported anywhere, so I guess there is a risk of
use-after-free: the source pointer may have been already registered by
some of amdgpu_irq_add_id() calls before the error occured.
The similar code exists in smu7_register_irq_handlers(), maybe should be
fixed as well.
Alex, is https://gitlab.freedesktop.org/agd5f/linux a public repo this
patch should go in? I'd suggest to drop the patch and ask Igor to do a
complete fix or, if dropping is not possible now, fix it by another patch.
For the latter one I can do this myself but it would be nice to refer to
the current patch via a git hash (it's probably not published yet in your
repo).
> +
> + return ret;
> }
>
> void *smu_atom_get_data_table(void *dev, uint32_t table, uint16_t *size,
> --
> 2.39.2
