linux-kernel - [PATCH AUTOSEL 5.15 22/41] video: fbdev: pxa3xx-gcu: Fix integer overflow in pxa3xx_gcu

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Date:   Mon, 27 Jun 2022 22:20:41 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Hyunwoo Kim <imv4bel@...il.com>, Helge Deller <deller@....de>,
        Sasha Levin <sashal@...nel.org>, yang.lee@...ux.alibaba.com,
        yangyingliang@...wei.com, cai.huoqing@...ux.dev,
        linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.15 22/41] video: fbdev: pxa3xx-gcu: Fix integer overflow in pxa3xx_gcu_write

From: Hyunwoo Kim <imv4bel@...il.com>

[ Upstream commit a09d2d00af53b43c6f11e6ab3cb58443c2cac8a7 ]

In pxa3xx_gcu_write, a count parameter of type size_t is passed to words of
type int.  Then, copy_from_user() may cause a heap overflow because it is used
as the third argument of copy_from_user().

Signed-off-by: Hyunwoo Kim <imv4bel@...il.com>
Signed-off-by: Helge Deller <deller@....de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/video/fbdev/pxa3xx-gcu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/video/fbdev/pxa3xx-gcu.c b/drivers/video/fbdev/pxa3xx-gcu.c
index 9421d14d0eb0..9e9888e40c57 100644
--- a/drivers/video/fbdev/pxa3xx-gcu.c
+++ b/drivers/video/fbdev/pxa3xx-gcu.c
@@ -381,7 +381,7 @@ pxa3xx_gcu_write(struct file *file, const char *buff,
 	struct pxa3xx_gcu_batch	*buffer;
 	struct pxa3xx_gcu_priv *priv = to_pxa3xx_gcu_priv(file);
 
-	int words = count / 4;
+	size_t words = count / 4;
 
 	/* Does not need to be atomic. There's a lock in user space,
 	 * but anyhow, this is just for statistics. */
-- 
2.35.1