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drm/vmwgfx: return -EFAULT for copy_to_user errors 

copy_to/from_user() returns the number of bytes remaining to be copied
but we want to return a negative error code here.  This gets returned to
userspace.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dan Carpenter 2010-06-04 12:24:13 +02:00 committed by Dave Airlie
parent e902a358c7
commit 9b8eb4d147
2 changed files with 7 additions and 2 deletions
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1
drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
View File

@ -644,6 +644,7 @@ int vmw_execbuf_ioctl(struct drm_device *dev, void *data,
ret = copy_from_user(cmd, user_cmd, arg->command_size);
if (unlikely(ret != 0)) {
ret = -EFAULT;
DRM_ERROR("Failed copying commands.\n");
goto out_commit;
}

8
drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
View File

@ -597,8 +597,10 @@ int vmw_surface_define_ioctl(struct drm_device *dev, void *data,
ret = copy_from_user(srf->sizes, user_sizes,
srf->num_sizes * sizeof(*srf->sizes));
if (unlikely(ret != 0))
if (unlikely(ret != 0)) {
ret = -EFAULT;
goto out_err1;
}
if (srf->scanout &&
srf->num_sizes == 1 &&
@ -697,9 +699,11 @@ int vmw_surface_reference_ioctl(struct drm_device *dev, void *data,
if (user_sizes)
ret = copy_to_user(user_sizes, srf->sizes,
srf->num_sizes * sizeof(*srf->sizes));
if (unlikely(ret != 0))
if (unlikely(ret != 0)) {
DRM_ERROR("copy_to_user failed %p %u\n",
user_sizes, srf->num_sizes);
ret = -EFAULT;
}
out_bad_resource:
out_no_reference:
ttm_base_object_unref(&base);