linux-kernel - [PATCH 2/4] drivers/staging/mei/interface.c: take size of pointed value, not pointer

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Date:	Fri, 16 Sep 2011 08:57:33 +0200
From:	Julia Lawall <julia@...u.dk>
To:	Greg Kroah-Hartman <gregkh@...e.de>
Cc:	kernel-janitors@...r.kernel.org,
	Tomas Winkler <tomas.winkler@...el.com>,
	Oren Weil <oren.jer.weil@...el.com>,
	Itzhak Tzeel-Krupp <itzhak.tzeel-krupp@...el.com>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/4] drivers/staging/mei/interface.c: take size of pointed value, not pointer

From: Julia Lawall <julia@...u.dk>

Sizeof a pointer-typed expression returns the size of the pointer, not that
of the pointed data.

The semantic patch that fixes this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression *e;
type T;
identifier f;
@@

f(...,(T)e,...,
-sizeof(e)
+sizeof(*e)
,...)
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---
 drivers/staging/mei/interface.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff -u -p a/drivers/staging/mei/interface.c b/drivers/staging/mei/interface.c
--- a/drivers/staging/mei/interface.c
+++ b/drivers/staging/mei/interface.c
@@ -332,7 +332,7 @@ int mei_send_flow_control(struct mei_dev
 	mei_hdr->reserved = 0;
 
 	mei_flow_control = (struct hbm_flow_control *) &dev->wr_msg_buf[1];
-	memset(mei_flow_control, 0, sizeof(mei_flow_control));
+	memset(mei_flow_control, 0, sizeof(*mei_flow_control));
 	mei_flow_control->host_addr = cl->host_client_id;
 	mei_flow_control->me_addr = cl->me_client_id;
 	mei_flow_control->cmd.cmd = MEI_FLOW_CONTROL_CMD;
@@ -396,7 +396,7 @@ int mei_disconnect(struct mei_device *de
 
 	mei_cli_disconnect =
 	    (struct hbm_client_disconnect_request *) &dev->wr_msg_buf[1];
-	memset(mei_cli_disconnect, 0, sizeof(mei_cli_disconnect));
+	memset(mei_cli_disconnect, 0, sizeof(*mei_cli_disconnect));
 	mei_cli_disconnect->host_addr = cl->host_client_id;
 	mei_cli_disconnect->me_addr = cl->me_client_id;
 	mei_cli_disconnect->cmd.cmd = CLIENT_DISCONNECT_REQ_CMD;

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