[PATCH AUTOSEL 6.10 064/121] drm/amdgu: fix Unintentional integer overflow for mall size

Sasha Levin
2024-08-01T00:15:06Z

From: Jesse Zhang <jesse.zhang@amd.com>

[ Upstream commit c09d2eff81a997c169e0cacacd6b60c5e3aa33f2 ]

Potentially overflowing expression mall_size_per_umc * adev->gmc.num_umc with type unsigned int (32 bits, unsigned)
is evaluated using 32-bit arithmetic,and then used in a context that expects an expression of type u64 (64 bits, unsigned).

Signed-off-by: Jesse Zhang <Jesse.Zhang@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
index 0e31bdb4b7cb6..71db111e20f80 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
@@ -1595,7 +1595,7 @@ static int amdgpu_discovery_get_mall_info(struct amdgpu_device *adev)
break;
case 2:
mall_size_per_umc = le32_to_cpu(mall_info->v2.mall_size_per_umc);
- adev->gmc.mall_size = mall_size_per_umc * adev->gmc.num_umc;
+ adev->gmc.mall_size = (uint64_t)mall_size_per_umc * adev->gmc.num_umc;
break;
default:
dev_err(adev->dev,
--
2.43.0