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

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Date:   Tue, 14 Dec 2021 04:18:17 -0800
From:   Qing Wang <wangqing@...o.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jonathan Hunter <jonathanh@...dia.com>,
        dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Wang Qing <wangqing@...o.com>
Subject: [PATCH] drm: tegra: use vmemdup_user instead of kvmalloc and copy_from_user

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

fix memdup_user.cocci warning:
gpu/drm/tegra/submit.c:172:8-16: WARNING opportunity for vmemdup_user

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

diff --git a/drivers/gpu/drm/tegra/submit.c b/drivers/gpu/drm/tegra/submit.c
index c326984..842a2d3
--- a/drivers/gpu/drm/tegra/submit.c
+++ b/drivers/gpu/drm/tegra/submit.c
@@ -169,16 +169,7 @@ static void *alloc_copy_user_array(void __user *from, size_t count, size_t size)
 	if (copy_len > 0x4000)
 		return ERR_PTR(-E2BIG);
 
-	data = kvmalloc(copy_len, GFP_KERNEL);
-	if (!data)
-		return ERR_PTR(-ENOMEM);
-
-	if (copy_from_user(data, from, copy_len)) {
-		kvfree(data);
-		return ERR_PTR(-EFAULT);
-	}
-
-	return data;
+	return vmemdup_user(from, copy_len);
 }
 
 static int submit_copy_gather_data(struct gather_bo **pbo, struct device *dev,
-- 
2.7.4