copy_from_user_inatomic() is actually a local function that returns
-EFAULT or positive values on error. Otherwise copy_from_user() returns
the number of bytes remaining to be copied. We want to return -EFAULT
here.
I removed an unlikely() because we just did a copy_from_user()
so I don't think it can possibly make a difference.
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---
Not compiled.
diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c b/drivers/gpu/drm/msm/msm_gem_submit.c
index 4896765..1172fe7 100644
--- a/drivers/gpu/drm/msm/msm_gem_submit.c
+++ b/drivers/gpu/drm/msm/msm_gem_submit.c
@@ -95,13 +95,13 @@ static int submit_lookup_objects(struct msm_gem_submit *submit,
*/
submit->bos[i].flags = 0;
- ret = copy_from_user_inatomic(&submit_bo, userptr, sizeof(submit_bo));
- if (unlikely(ret)) {
+ if (copy_from_user_inatomic(&submit_bo, userptr, sizeof(submit_bo))) {
pagefault_enable();
spin_unlock(&file->table_lock);
- ret = copy_from_user(&submit_bo, userptr, sizeof(submit_bo));
- if (ret)
+ if (copy_from_user(&submit_bo, userptr, sizeof(submit_bo))) {
+ ret = -EFAULT;
goto out;
+ }
spin_lock(&file->table_lock);
pagefault_disable();
}
@@ -317,9 +317,10 @@ static int submit_reloc(struct msm_gem_submit *submit, struct msm_gem_object *ob
uint64_t iova;
bool valid;
- ret = copy_from_user(&submit_reloc, userptr, sizeof(submit_reloc));
- if (ret)
+ if (copy_from_user(&submit_reloc, userptr, sizeof(submit_reloc))) {
+ ret = -EFAULT;
goto out;
+ }
if (submit_reloc.submit_offset % 4) {
DRM_ERROR("non-aligned reloc offset: %u\n",
--
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