From: Tomas Winkler <tomas.winkler@intel.com>
Date: Mon, 2 Sep 2013 00:11:00 +0000 (+0300)
Subject: mei: mei_cl_link protect open_handle_count from overflow
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=caaeb09afda3a2239e02d495cea7e629136e09ee;p=sagit-ice-cold%2Fkernel_xiaomi_msm8998.git

mei: mei_cl_link protect open_handle_count from overflow

mei_cl_link is called both from mei_open and also from
in-kernel drivers so we need to protect open_handle_count
from overflow

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c
index e0684b4d9a08..a82b443e4518 100644
--- a/drivers/misc/mei/client.c
+++ b/drivers/misc/mei/client.c
@@ -287,6 +287,12 @@ int mei_cl_link(struct mei_cl *cl, int id)
 		return -ENOENT;
 	}
 
+	if (dev->open_handle_count >= MEI_MAX_OPEN_HANDLE_COUNT) {
+		dev_err(&dev->pdev->dev, "open_handle_count exceded %d",
+			MEI_MAX_OPEN_HANDLE_COUNT);
+		return -ENOENT;
+	}
+
 	dev->open_handle_count++;
 
 	cl->host_client_id = id;