linux-kernel - [PATCH] gpu/drm/radeon:Fix null pointer risk

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Message-Id: <20211228073126.48906-1-wenzhiwei@kylinos.cn>
Date:   Tue, 28 Dec 2021 15:31:26 +0800
From:   Wen Zhiwei <wenzhiwei@...inos.cn>
To:     alexander.deucher@....com, christian.koenig@....com,
        Xinhui.Pan@....com, airlied@...ux.ie, daniel@...ll.ch
Cc:     wenzhiwei@...inos.cn, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH] gpu/drm/radeon:Fix null pointer risk

If the null pointer is not judged in advance,
there is a risk that the pointer will cross
the boundary

Signed-off-by: Wen Zhiwei <wenzhiwei@...inos.cn>
---
 drivers/gpu/drm/radeon/radeon_vm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/radeon/radeon_vm.c b/drivers/gpu/drm/radeon/radeon_vm.c
index bb53016f3138..d3d342041adf 100644
--- a/drivers/gpu/drm/radeon/radeon_vm.c
+++ b/drivers/gpu/drm/radeon/radeon_vm.c
@@ -951,7 +951,7 @@ int radeon_vm_bo_update(struct radeon_device *rdev,
 
 		if (mem->mem_type == TTM_PL_TT) {
 			bo_va->flags |= RADEON_VM_PAGE_SYSTEM;
-			if (!(bo_va->bo->flags & (RADEON_GEM_GTT_WC | RADEON_GEM_GTT_UC)))
+			if (bo_va->bo && !(bo_va->bo->flags & (RADEON_GEM_GTT_WC | RADEON_GEM_GTT_UC)))
 				bo_va->flags |= RADEON_VM_PAGE_SNOOPED;
 
 		} else {
-- 
2.30.0