Patch "drm/amdgpu: add list empty check to avoid null pointer issue" has been added to the 6.10-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    drm/amdgpu: add list empty check to avoid null pointer issue

to the 6.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-amdgpu-add-list-empty-check-to-avoid-null-pointe.patch
and it can be found in the queue-6.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit eca008855174ca03f598be20cc15d16391300e7d
Author: Yang Wang <kevinyang.wang@xxxxxxx>
Date:   Wed Aug 21 14:42:41 2024 +0800

    drm/amdgpu: add list empty check to avoid null pointer issue
    
    [ Upstream commit 4416377ae1fdc41a90b665943152ccd7ff61d3c5 ]
    
    Add list empty check to avoid null pointer issues in some corner cases.
    - list_for_each_entry_safe()
    
    Signed-off-by: Yang Wang <kevinyang.wang@xxxxxxx>
    Reviewed-by: Tao Zhou <tao.zhou1@xxxxxxx>
    Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_aca.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_aca.c
index 9baee7c246b6d..a513819b72311 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_aca.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_aca.c
@@ -80,6 +80,9 @@ static void aca_banks_release(struct aca_banks *banks)
 {
 	struct aca_bank_node *node, *tmp;
 
+	if (list_empty(&banks->list))
+		return;
+
 	list_for_each_entry_safe(node, tmp, &banks->list, node) {
 		list_del(&node->node);
 		kvfree(node);
@@ -562,9 +565,13 @@ static void aca_error_fini(struct aca_error *aerr)
 	struct aca_bank_error *bank_error, *tmp;
 
 	mutex_lock(&aerr->lock);
+	if (list_empty(&aerr->list))
+		goto out_unlock;
+
 	list_for_each_entry_safe(bank_error, tmp, &aerr->list, node)
 		aca_bank_error_remove(aerr, bank_error);
 
+out_unlock:
 	mutex_destroy(&aerr->lock);
 }
 
@@ -680,6 +687,9 @@ static void aca_manager_fini(struct aca_handle_manager *mgr)
 {
 	struct aca_handle *handle, *tmp;
 
+	if (list_empty(&mgr->list))
+		return;
+
 	list_for_each_entry_safe(handle, tmp, &mgr->list, node)
 		amdgpu_aca_remove_handle(handle);
 }