From e96e1ac821118a042038ffab293557612c02e5c8 Mon Sep 17 00:00:00 2001
From: zrlw <40652892+zrlw@users.noreply.github.com>
Date: Sun, 8 Jul 2018 16:04:29 +0800
Subject: [PATCH] Update meye.c

validate user-controlled offset paramter to avoid  arbitrary access.
---
 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 8001d3e9134e44..db2a7ad1e52319 100644
--- a/drivers/media/pci/meye/meye.c
+++ b/drivers/media/pci/meye/meye.c
@@ -1460,7 +1460,7 @@ 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;
 	}