linux-kernel - [PATCH] gpu: drm: nouveau: switch over to vmemdup

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Date:   Mon, 18 Oct 2021 01:00:03 -0700
From:   Qing Wang <wangqing@...o.com>
To:     Ben Skeggs <bskeggs@...hat.com>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Cc:     Qing Wang <wangqing@...o.com>
Subject: [PATCH] gpu: drm: nouveau: switch over to vmemdup_user()

This patch fixes the following Coccinelle warning:

drivers/gpu/drm/nouveau/nouveau_gem.c:630: WARNING opportunity for vmemdup_user

Use vmemdup_user rather than duplicating its implementation
This is a little bit restricted to reduce false positives

Signed-off-by: Qing Wang <wangqing@...o.com>
---
 drivers/gpu/drm/nouveau/nouveau_gem.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_gem.c b/drivers/gpu/drm/nouveau/nouveau_gem.c
index 8c2ecc2..3fc6959
--- a/drivers/gpu/drm/nouveau/nouveau_gem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_gem.c
@@ -627,14 +627,9 @@ u_memcpya(uint64_t user, unsigned nmemb, unsigned size)
 
 	size *= nmemb;
 
-	mem = kvmalloc(size, GFP_KERNEL);
-	if (!mem)
-		return ERR_PTR(-ENOMEM);
-
-	if (copy_from_user(mem, userptr, size)) {
-		u_free(mem);
-		return ERR_PTR(-EFAULT);
-	}
+	mem = vmemdup_user(userptr, size);
+	if (IS_ERR(mem))
+		return ERR_PTR(PTR_ERR(mem));
 
 	return mem;
 }
-- 
2.7.4