linux-kernel - [char-misc-next 2/5] mei: make sure that me_clients

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Date:	Mon,  2 Sep 2013 03:11:01 +0300
From:	Tomas Winkler <tomas.winkler@...el.com>
To:	gregkh@...uxfoundation.org
Cc:	arnd@...db.de, linux-kernel@...r.kernel.org,
	Tomas Winkler <tomas.winkler@...el.com>
Subject: [char-misc-next 2/5] mei: make sure that me_clients_map big enough before copying

To make static analyzers happy validated that
sizeof me_clients_map  is larger than sizeof valid_addresses from the
enumeration response before memcpy
We can use BUILD_ON macro as both arrays are defined statically

Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
---
 drivers/misc/mei/hbm.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/mei/hbm.c b/drivers/misc/mei/hbm.c
index 6127ab6..95d4dab 100644
--- a/drivers/misc/mei/hbm.c
+++ b/drivers/misc/mei/hbm.c
@@ -673,7 +673,10 @@ void mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr)
 
 	case HOST_ENUM_RES_CMD:
 		enum_res = (struct hbm_host_enum_response *) mei_msg;
-		memcpy(dev->me_clients_map, enum_res->valid_addresses, 32);
+		BUILD_BUG_ON(sizeof(dev->me_clients_map)
+				< sizeof(enum_res->valid_addresses));
+		memcpy(dev->me_clients_map, enum_res->valid_addresses,
+			sizeof(enum_res->valid_addresses));
 		if (dev->dev_state == MEI_DEV_INIT_CLIENTS &&
 		    dev->hbm_state == MEI_HBM_ENUM_CLIENTS) {
 				dev->init_clients_timer = 0;
-- 
1.8.3.1

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