From b73a3233de4b17d80cfb100dcda2216cb3fcf8c6 Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Tue, 8 Mar 2016 15:09:41 +0300 Subject: [PATCH] drm/vc4: Return -EFAULT on copy_from_user() failure The copy_from_user() function returns the number of bytes not copied but we want to return a negative error code. Fixes: 463873d57014 ('drm/vc4: Add an API for creating GPU shaders in GEM BOs.') Cc: stable@vger.kernel.org Signed-off-by: Dan Carpenter Reviewed-by: Eric Anholt Signed-off-by: Eric Anholt (cherry picked from commit 585cb132a48190b554aecda2ebc3e2911fcbb665) --- drivers/gpu/drm/vc4/vc4_bo.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) --- a/drivers/gpu/drm/vc4/vc4_bo.c +++ b/drivers/gpu/drm/vc4/vc4_bo.c @@ -519,11 +519,12 @@ vc4_create_shader_bo_ioctl(struct drm_de if (IS_ERR(bo)) return PTR_ERR(bo); - ret = copy_from_user(bo->base.vaddr, + if (copy_from_user(bo->base.vaddr, (void __user *)(uintptr_t)args->data, - args->size); - if (ret != 0) + args->size)) { + ret = -EFAULT; goto fail; + } /* Clear the rest of the memory from allocating from the BO * cache. */