linux-kernel - [PATCH] drm: nouveau: use vmemdup_user instead of kvmalloc and copy_from

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Date:   Tue, 14 Dec 2021 04:17:46 -0800
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:     Wang Qing <wangqing@...o.com>
Subject: [PATCH] drm: nouveau: use vmemdup_user instead of kvmalloc and copy_from_user

From: Wang Qing <wangqing@...o.com>

fix memdup_user.cocci warning:
nouveau_gem.c:630:7-15: WARNING opportunity for vmemdup_user

Signed-off-by: Wang Qing <wangqing@...o.com>
---
 drivers/gpu/drm/nouveau/nouveau_gem.c | 11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_gem.c b/drivers/gpu/drm/nouveau/nouveau_gem.c
index 9416bee..befb864
--- a/drivers/gpu/drm/nouveau/nouveau_gem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_gem.c
@@ -627,16 +627,7 @@ 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);
-	}
-
-	return mem;
+	return vmemdup_user(userptr, size);
 }
 
 static int
-- 
2.7.4