linux-kernel - [PATCH 4.9 062/222] media: fix: media: pci: meye: validate offset to avoid arbitrary access

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Message-Id: <20191122100859.905517569@linuxfoundation.org>
Date:   Fri, 22 Nov 2019 11:26:42 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Lao Wei <zrlw@...com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 062/222] media: fix: media: pci: meye: validate offset to avoid arbitrary access

From: Lao Wei <zrlw@...com>

[ Upstream commit eac7230fdb4672c2cb56f6a01a1744f562c01f80 ]

Motion eye video4linux driver for Sony Vaio PictureBook desn't validate user-controlled parameter
'vma->vm_pgoff', a malicious process might access all of kernel memory from user space by trying
pass different arbitrary address.
Discussion: http://www.openwall.com/lists/oss-security/2018/07/06/1

Signed-off-by: Lao Wei <zrlw@...com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/pci/meye/meye.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/pci/meye/meye.c b/drivers/media/pci/meye/meye.c
index ba887e8e1b171..a85c5199ccd30 100644
--- a/drivers/media/pci/meye/meye.c
+++ b/drivers/media/pci/meye/meye.c
@@ -1469,7 +1469,7 @@ static int meye_mmap(struct file *file, struct vm_area_struct *vma)
 	unsigned long page, pos;
 
 	mutex_lock(&meye.lock);
-	if (size > gbuffers * gbufsize) {
+	if (size > gbuffers * gbufsize || offset > gbuffers * gbufsize - size) {
 		mutex_unlock(&meye.lock);
 		return -EINVAL;
 	}
-- 
2.20.1