On 2019-05-29 11:07 a.m., Colin King wrote:
> From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
>
> The pointer dev is set to null yet it is being dereferenced when
> checking dev->dqm->sched_policy. Fix this by performing the check
> on dev->dqm->sched_policy after dev has been assigned and null
> checked. Also remove the redundant null assignment to dev.
>
> Addresses-Coverity: ("Explicit null dereference")
> Fixes: 1a058c337676 ("drm/amdkfd: New IOCTL to allocate queue GWS")
> Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
Reviewed-by: Felix Kuehling <Felix.Kuehling@xxxxxxx>
Thanks!
Felix
> ---
> drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 7 ++++---
> 1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> index aab2aa6c1dee..ea82828fdc76 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> @@ -1572,10 +1572,9 @@ static int kfd_ioctl_alloc_queue_gws(struct file *filep,
> {
> int retval;
> struct kfd_ioctl_alloc_queue_gws_args *args = data;
> - struct kfd_dev *dev = NULL;
> + struct kfd_dev *dev;
>
> - if (!hws_gws_support ||
> - dev->dqm->sched_policy == KFD_SCHED_POLICY_NO_HWS)
> + if (!hws_gws_support)
> return -EINVAL;
>
> dev = kfd_device_by_id(args->gpu_id);
> @@ -1583,6 +1582,8 @@ static int kfd_ioctl_alloc_queue_gws(struct file *filep,
> pr_debug("Could not find gpu id 0x%x\n", args->gpu_id);
> return -EINVAL;
> }
> + if (dev->dqm->sched_policy == KFD_SCHED_POLICY_NO_HWS)
> + return -EINVAL;
>
> mutex_lock(&p->mutex);
> retval = pqm_set_gws(&p->pqm, args->queue_id, args->num_gws ? dev->gws : NULL);
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