linux-kernel - [PATCH] Staging: drivers/gpu/drm/amd/amdgpu: Fix null pointer deference in amdkfd_fence_get_timeline

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Message-ID: <20240920090959.30755-1-kdipendra88@gmail.com>
Date: Fri, 20 Sep 2024 09:09:57 +0000
From: Dipendra Khadka <kdipendra88@...il.com>
To: Felix.Kuehling@....com,
	alexander.deucher@....com,
	christian.koenig@....com,
	Xinhui.Pan@....com,
	airlied@...il.com,
	daniel@...ll.ch
Cc: Dipendra Khadka <kdipendra88@...il.com>,
	amd-gfx@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] Staging: drivers/gpu/drm/amd/amdgpu: Fix null pointer deference in amdkfd_fence_get_timeline_name

'''
drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_fence.c:108:9: error: Null pointer dereference: fence [nullPointer]
 return fence->timeline_name;
        ^
'''

The method to_amdgpu_amdkfd_fence can return NULL incase of empty f
or f->ops != &amdkfd_fence_ops.Hence, check has been added .
If fence is null , then null is returned. 

Signed-off-by: Dipendra Khadka <kdipendra88@...il.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_fence.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_fence.c
index 1ef758ac5076..2313babcc944 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_fence.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_fence.c
@@ -105,6 +105,9 @@ static const char *amdkfd_fence_get_timeline_name(struct dma_fence *f)
 {
 	struct amdgpu_amdkfd_fence *fence = to_amdgpu_amdkfd_fence(f);
 
+	if (!fence)
+		return NULL;
+
 	return fence->timeline_name;
 }
 
-- 
2.43.0