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From deb04405c9c7362840387414fcf33f01d056c697 Mon Sep 17 00:00:00 2001
From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Tue, 8 Mar 2016 15:09:41 +0300
Subject: [PATCH 293/423] 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 <dan.carpenter@oracle.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Eric Anholt <eric@anholt.net>
(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.
*/
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