[PATCH 1/2] GPU-DRM-Savage: Use memdup_user() rather than duplicating

[SF Markus Elfring]

From: Markus Elfring <elfr...@users.sourceforge.net>
Date: Thu, 18 Aug 2016 18:12:03 +0200

Reuse existing functionality from memdup_user() instead of keeping
duplicate source code.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring at users.sourceforge.net>
---
 drivers/gpu/drm/savage/savage_state.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/savage/savage_state.c 
b/drivers/gpu/drm/savage/savage_state.c
index c01ad0a..3dc0d8f 100644
--- a/drivers/gpu/drm/savage/savage_state.c
+++ b/drivers/gpu/drm/savage/savage_state.c
@@ -1001,15 +1001,9 @@ int savage_bci_cmdbuf(struct drm_device *dev, void 
*data, struct drm_file *file_
                cmdbuf->cmd_addr = kcmd_addr;
        }
        if (cmdbuf->vb_size) {
-               kvb_addr = kmalloc(cmdbuf->vb_size, GFP_KERNEL);
-               if (kvb_addr == NULL) {
-                       ret = -ENOMEM;
-                       goto done;
-               }
-
-               if (copy_from_user(kvb_addr, cmdbuf->vb_addr,
-                                      cmdbuf->vb_size)) {
-                       ret = -EFAULT;
+               kvb_addr = memdup_user(cmdbuf->vb_addr, cmdbuf->vb_size);
+               if (IS_ERR(kvb_addr)) {
+                       ret = PTR_ERR(kvb_addr);
                        goto done;
                }
                cmdbuf->vb_addr = kvb_addr;
-- 
2.9.3