Patch "drm/amdkfd: Confirm list is non-empty before utilizing list_first_entry in kfd_topology.c" has been added to the 6.6-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

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

    drm/amdkfd: Confirm list is non-empty before utilizing list_first_entry in kfd_topology.c

to the 6.6-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-amdkfd-confirm-list-is-non-empty-before-utilizin.patch
and it can be found in the queue-6.6 subdirectory.

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



commit abb95430217860277a3dee96b002ae8f761cfd23
Author: Srinivasan Shanmugam <srinivasan.shanmugam@xxxxxxx>
Date:   Thu Dec 21 07:16:23 2023 +0530

    drm/amdkfd: Confirm list is non-empty before utilizing list_first_entry in kfd_topology.c
    
    [ Upstream commit 499839eca34ad62d43025ec0b46b80e77065f6d8 ]
    
    Before using list_first_entry, make sure to check that list is not
    empty, if list is empty return -ENODATA.
    
    Fixes the below:
    drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_topology.c:1347 kfd_create_indirect_link_prop() warn: can 'gpu_link' even be NULL?
    drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_topology.c:1428 kfd_add_peer_prop() warn: can 'iolink1' even be NULL?
    drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_topology.c:1433 kfd_add_peer_prop() warn: can 'iolink2' even be NULL?
    
    Fixes: 0f28cca87e9a ("drm/amdkfd: Extend KFD device topology to surface peer-to-peer links")
    Cc: Felix Kuehling <Felix.Kuehling@xxxxxxx>
    Cc: Christian König <christian.koenig@xxxxxxx>
    Cc: Alex Deucher <alexander.deucher@xxxxxxx>
    Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@xxxxxxx>
    Suggested-by: Felix Kuehling <Felix.Kuehling@xxxxxxx>
    Suggested-by: Lijo Lazar <lijo.lazar@xxxxxxx>
    Reviewed-by: Felix Kuehling <felix.kuehling@xxxxxxx>
    Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_topology.c b/drivers/gpu/drm/amd/amdkfd/kfd_topology.c
index c8c75ff7cea8..6e75e8fa18be 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_topology.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_topology.c
@@ -1342,10 +1342,11 @@ static int kfd_create_indirect_link_prop(struct kfd_topology_device *kdev, int g
 		num_cpu++;
 	}
 
+	if (list_empty(&kdev->io_link_props))
+		return -ENODATA;
+
 	gpu_link = list_first_entry(&kdev->io_link_props,
-					struct kfd_iolink_properties, list);
-	if (!gpu_link)
-		return -ENOMEM;
+				    struct kfd_iolink_properties, list);
 
 	for (i = 0; i < num_cpu; i++) {
 		/* CPU <--> GPU */
@@ -1423,15 +1424,17 @@ static int kfd_add_peer_prop(struct kfd_topology_device *kdev,
 				peer->gpu->adev))
 		return ret;
 
+	if (list_empty(&kdev->io_link_props))
+		return -ENODATA;
+
 	iolink1 = list_first_entry(&kdev->io_link_props,
-							struct kfd_iolink_properties, list);
-	if (!iolink1)
-		return -ENOMEM;
+				   struct kfd_iolink_properties, list);
+
+	if (list_empty(&peer->io_link_props))
+		return -ENODATA;
 
 	iolink2 = list_first_entry(&peer->io_link_props,
-							struct kfd_iolink_properties, list);
-	if (!iolink2)
-		return -ENOMEM;
+				   struct kfd_iolink_properties, list);
 
 	props = kfd_alloc_struct(props);
 	if (!props)