drm/msm: return -EFAULT if copy_from_user() fails
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@oracle.com> Signed-off-by: Rob Clark <robdclark@gmail.com>
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@ -95,13 +95,13 @@ static int submit_lookup_objects(struct msm_gem_submit *submit,
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*/
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*/
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submit->bos[i].flags = 0;
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submit->bos[i].flags = 0;
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ret = copy_from_user_inatomic(&submit_bo, userptr, sizeof(submit_bo));
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if (copy_from_user_inatomic(&submit_bo, userptr, sizeof(submit_bo))) {
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if (unlikely(ret)) {
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pagefault_enable();
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pagefault_enable();
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spin_unlock(&file->table_lock);
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spin_unlock(&file->table_lock);
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ret = copy_from_user(&submit_bo, userptr, sizeof(submit_bo));
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if (copy_from_user(&submit_bo, userptr, sizeof(submit_bo))) {
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if (ret)
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ret = -EFAULT;
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goto out;
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goto out;
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}
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spin_lock(&file->table_lock);
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spin_lock(&file->table_lock);
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pagefault_disable();
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pagefault_disable();
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}
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}
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@ -317,9 +317,10 @@ static int submit_reloc(struct msm_gem_submit *submit, struct msm_gem_object *ob
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uint64_t iova;
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uint64_t iova;
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bool valid;
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bool valid;
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ret = copy_from_user(&submit_reloc, userptr, sizeof(submit_reloc));
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if (copy_from_user(&submit_reloc, userptr, sizeof(submit_reloc))) {
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if (ret)
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ret = -EFAULT;
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goto out;
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goto out;
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}
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if (submit_reloc.submit_offset % 4) {
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if (submit_reloc.submit_offset % 4) {
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DRM_ERROR("non-aligned reloc offset: %u\n",
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DRM_ERROR("non-aligned reloc offset: %u\n",
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