[PATCH] drm/amdkfd: Fix 'node' NULL check in 'svm_range_get_range_boundaries()'
Felix Kuehling
felix.kuehling at amd.com
Wed Jan 10 15:44:12 UTC 2024
On 2024-01-10 03:26, Srinivasan Shanmugam wrote:
> Range interval [start, last] is ordered by rb_tree, rb_prev, rb_next
> return value still needs NULL check, thus modified from "node" to "rb_node".
>
> Fixes the below:
> drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_svm.c:2691 svm_range_get_range_boundaries() warn: can 'node' even be NULL?
>
> Suggested-by: Philip Yang <Philip.Yang at amd.com>
> Cc: Felix Kuehling <Felix.Kuehling at amd.com>
> Cc: Christian König <christian.koenig at amd.com>
> Cc: Alex Deucher <alexander.deucher at amd.com>
> Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam at amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling at amd.com>
> ---
> drivers/gpu/drm/amd/amdkfd/kfd_svm.c | 10 +++++-----
> 1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
> index 3b78e48832e9..6aa032731ddc 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
> @@ -2656,6 +2656,7 @@ svm_range_get_range_boundaries(struct kfd_process *p, int64_t addr,
> {
> struct vm_area_struct *vma;
> struct interval_tree_node *node;
> + struct rb_node *rb_node;
> unsigned long start_limit, end_limit;
>
> vma = vma_lookup(p->mm, addr << PAGE_SHIFT);
> @@ -2678,16 +2679,15 @@ svm_range_get_range_boundaries(struct kfd_process *p, int64_t addr,
> if (node) {
> end_limit = min(end_limit, node->start);
> /* Last range that ends before the fault address */
> - node = container_of(rb_prev(&node->rb),
> - struct interval_tree_node, rb);
> + rb_node = rb_prev(&node->rb);
> } else {
> /* Last range must end before addr because
> * there was no range after addr
> */
> - node = container_of(rb_last(&p->svms.objects.rb_root),
> - struct interval_tree_node, rb);
> + rb_node = rb_last(&p->svms.objects.rb_root);
> }
> - if (node) {
> + if (rb_node) {
> + node = container_of(rb_node, struct interval_tree_node, rb);
> if (node->last >= addr) {
> WARN(1, "Overlap with prev node and page fault addr\n");
> return -EFAULT;
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