From 23f70373f52921da3fc385e1b9de3cbd41d4496e Mon Sep 17 00:00:00 2001
From: Andrew Martin <Andrew.Martin@amd.com>
Date: Tue, 26 Nov 2024 12:10:59 -0500
Subject: [PATCH] drm/amdkfd: Dereference null return value
In the function pqm_uninit there is a call-assignment of "pdd =
kfd_get_process_device_data" which could be null, and this value was
later dereferenced without checking.
Fixes: fb91065851cd ("drm/amdkfd: Refactor queue wptr_bo GART mapping")
Signed-off-by: Andrew Martin <Andrew.Martin@amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>
---
.../gpu/drm/amd/amdkfd/kfd_process_queue_manager.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c b/drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c
index 1c3c0a686df29..9df56f8e09f91 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c
@@ -214,13 +214,17 @@ static void pqm_clean_queue_resource(struct process_queue_manager *pqm,
void pqm_uninit(struct process_queue_manager *pqm)
{
struct process_queue_node *pqn, *next;
- struct kfd_process_device *pdd;
list_for_each_entry_safe(pqn, next, &pqm->queues, process_queue_list) {
if (pqn->q) {
- pdd = kfd_get_process_device_data(pqn->q->device, pqm->process);
- kfd_queue_unref_bo_vas(pdd, &pqn->q->properties);
- kfd_queue_release_buffers(pdd, &pqn->q->properties);
+ struct kfd_process_device *pdd = kfd_get_process_device_data(pqn->q->device,
+ pqm->process);
+ if (pdd) {
+ kfd_queue_unref_bo_vas(pdd, &pqn->q->properties);
+ kfd_queue_release_buffers(pdd, &pqn->q->properties);
+ } else {
+ WARN_ON(!pdd);
+ }
pqm_clean_queue_resource(pqm, pqn);
}
--
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