[PATCH] drm/amdgpu: validate the parameters of amdgpu_vm_bo_clear_mappings

[xinhui pan]

Ensure there is no address overlapping.

Reported-by: Vlad Stolyarov <hexed at google.com>
Signed-off-by: xinhui pan <xinhui.pan at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 8af3f0fd3073..f1315a854192 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -1852,6 +1852,12 @@ int amdgpu_vm_bo_clear_mappings(struct amdgpu_device *adev,
 	LIST_HEAD(removed);
 	uint64_t eaddr;
 
+	/* validate the parameters */
+	if (saddr & ~PAGE_MASK || size & ~PAGE_MASK)
+		return -EINVAL;
+	if (saddr + size <= saddr)
+		return -EINVAL;
+
 	eaddr = saddr + size - 1;
 	saddr /= AMDGPU_GPU_PAGE_SIZE;
 	eaddr /= AMDGPU_GPU_PAGE_SIZE;
-- 
2.34.1