From: Dan Carpenter Date: Tue, 11 Jul 2017 19:53:29 +0000 (+0300) Subject: drm/amdgpu: Off by one sanity checks X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=1d11ee89862ae7c1932e8b742fbb8340598f8874;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git drm/amdgpu: Off by one sanity checks This is just future proofing code, not something that can be triggered in real life. We're testing to make sure we don't shift wrap when we do "1ull << i" so "i" has to be in the 0-63 range. If it's 64 then we have gone too far. Acked-by: Christian König Signed-off-by: Dan Carpenter Signed-off-by: Alex Deucher --- diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c index 4bb12ee46315..3fbc7b22446c 100644 --- a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c @@ -4564,7 +4564,7 @@ static int gfx_v8_0_kiq_kcq_enable(struct amdgpu_device *adev) /* This situation may be hit in the future if a new HW * generation exposes more than 64 queues. If so, the * definition of queue_mask needs updating */ - if (WARN_ON(i > (sizeof(queue_mask)*8))) { + if (WARN_ON(i >= (sizeof(queue_mask)*8))) { DRM_ERROR("Invalid KCQ enabled: %d\n", i); break; } diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c index 3a0b69b09ed6..e63925dffd2a 100644 --- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c @@ -2425,7 +2425,7 @@ static int gfx_v9_0_kiq_kcq_enable(struct amdgpu_device *adev) /* This situation may be hit in the future if a new HW * generation exposes more than 64 queues. If so, the * definition of queue_mask needs updating */ - if (WARN_ON(i > (sizeof(queue_mask)*8))) { + if (WARN_ON(i >= (sizeof(queue_mask)*8))) { DRM_ERROR("Invalid KCQ enabled: %d\n", i); break; } diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c index 955aa304ff48..0def783889cd 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c @@ -671,7 +671,7 @@ static int set_sched_resources(struct device_queue_manager *dqm) /* This situation may be hit in the future if a new HW * generation exposes more than 64 queues. If so, the * definition of res.queue_mask needs updating */ - if (WARN_ON(i > (sizeof(res.queue_mask)*8))) { + if (WARN_ON(i >= (sizeof(res.queue_mask)*8))) { pr_err("Invalid queue enabled by amdgpu: %d\n", i); break; }