From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Hyunwoo Kim <imv4bel@gmail.com>, Helge Deller <deller@gmx.de>,
Sasha Levin <sashal@kernel.org>,
cai.huoqing@linux.dev, yang.lee@linux.alibaba.com,
yangyingliang@huawei.com, linux-fbdev@vger.kernel.org,
dri-devel@lists.freedesktop.org
Subject: [PATCH AUTOSEL 4.14 09/17] video: fbdev: pxa3xx-gcu: Fix integer overflow in pxa3xx_gcu_write
Date: Mon, 27 Jun 2022 22:26:07 -0400 [thread overview]
Message-ID: <20220628022615.596977-9-sashal@kernel.org> (raw)
In-Reply-To: <20220628022615.596977-1-sashal@kernel.org>
From: Hyunwoo Kim <imv4bel@gmail.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@gmail.com>
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Sasha Levin <sashal@kernel.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 4febbe21b9b5..db861bb39150 100644
--- a/drivers/video/fbdev/pxa3xx-gcu.c
+++ b/drivers/video/fbdev/pxa3xx-gcu.c
@@ -391,7 +391,7 @@ 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
next prev parent reply other threads:[~2022-06-28 2:30 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20220628022615.596977-1-sashal@kernel.org>
2022-06-28 2:26 ` [PATCH AUTOSEL 4.14 07/17] video: fbdev: skeletonfb: Fix syntax errors in comments Sasha Levin
2022-06-28 2:26 ` [PATCH AUTOSEL 4.14 08/17] video: fbdev: intelfb: Use aperture size from pci_resource_len Sasha Levin
2022-06-28 2:26 ` Sasha Levin [this message]
2022-06-28 2:26 ` [PATCH AUTOSEL 4.14 10/17] video: fbdev: simplefb: Check before clk_put() not needed Sasha Levin
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