[patch 1/2] drm/tegra: return -EFAULT if copy_from_user() fails

[Dan Carpenter]

copy_from_user() returns the number of bytes remaining if it fails, but
we want to return -EFAULT here.

Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>

diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index 28e1781..fd3ff3b 100644
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -163,9 +163,10 @@ int tegra_drm_submit(struct tegra_drm_context *context,
                struct drm_tegra_cmdbuf cmdbuf;
                struct host1x_bo *bo;

-               err = copy_from_user(&cmdbuf, cmdbufs, sizeof(cmdbuf));
-               if (err)
+               if (copy_from_user(&cmdbuf, cmdbufs, sizeof(cmdbuf))) {
+                       err = -EFAULT;
                        goto fail;
+               }

                bo = host1x_bo_lookup(drm, file, cmdbuf.handle);
                if (!bo) {
@@ -178,10 +179,11 @@ int tegra_drm_submit(struct tegra_drm_context *context,
                cmdbufs++;
        }

-       err = copy_from_user(job->relocarray, relocs,
-                            sizeof(*relocs) * num_relocs);
-       if (err)
+       if (copy_from_user(job->relocarray, relocs,
+                          sizeof(*relocs) * num_relocs)) {
+               err = -EFAULT;
                goto fail;
+       }

        while (num_relocs--) {
                struct host1x_reloc *reloc = &job->relocarray[num_relocs];
@@ -199,15 +201,17 @@ int tegra_drm_submit(struct tegra_drm_context *context,
                }
        }

-       err = copy_from_user(job->waitchk, waitchks,
-                            sizeof(*waitchks) * num_waitchks);
-       if (err)
+       if (copy_from_user(job->waitchk, waitchks,
+                          sizeof(*waitchks) * num_waitchks)) {
+               err = -EFAULT;
                goto fail;
+       }

-       err = copy_from_user(&syncpt, (void * __user)(uintptr_t)args->syncpts,
-                            sizeof(syncpt));
-       if (err)
+       if (copy_from_user(&syncpt, (void * __user)(uintptr_t)args->syncpts,
+                          sizeof(syncpt))) {
+               err = -EFAULT;
                goto fail;
+       }

        job->is_addr_reg = context->client->ops->is_addr_reg;
        job->syncpt_incrs = syncpt.incrs;