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drm/amdgpu: Use memdup_array_user in amdgpu_cs_wait_fences_ioctl

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Replace kmalloc_array() + copy_from_user() with memdup_array_user().

This shrinks the source code and improves separation between the kernel
and userspace slabs.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Tvrtko Ursulin
2025-06-12 11:44:27 +01:00
committed by Alex Deucher
parent c4ac100e9a
commit dea75df7af
1 changed files with 5 additions and 14 deletions
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19
drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
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@@ -1767,30 +1767,21 @@ int amdgpu_cs_wait_fences_ioctl(struct drm_device *dev, void *data,
{
struct amdgpu_device *adev = drm_to_adev(dev);
union drm_amdgpu_wait_fences *wait = data;
uint32_t fence_count = wait->in.fence_count;
struct drm_amdgpu_fence *fences_user;
struct drm_amdgpu_fence *fences;
int r;
/* Get the fences from userspace */
fences = kmalloc_array(fence_count, sizeof(struct drm_amdgpu_fence),
GFP_KERNEL);
if (fences == NULL)
return -ENOMEM;
fences_user = u64_to_user_ptr(wait->in.fences);
if (copy_from_user(fences, fences_user,
sizeof(struct drm_amdgpu_fence) * fence_count)) {
r = -EFAULT;
goto err_free_fences;
}
fences = memdup_array_user(u64_to_user_ptr(wait->in.fences),
wait->in.fence_count,
sizeof(struct drm_amdgpu_fence));
if (IS_ERR(fences))
return PTR_ERR(fences);
if (wait->in.wait_all)
r = amdgpu_cs_wait_all_fences(adev, filp, wait, fences);
else
r = amdgpu_cs_wait_any_fence(adev, filp, wait, fences);
err_free_fences:
kfree(fences);
return r;