linux-kernel - [PATCH 4/9] drivers/net/sfc: Correct code taking the size of a pointer

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Date:	Sun, 13 Dec 2009 12:41:29 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	linux-net-drivers@...arflare.com,
	Steve Hodgson <shodgson@...arflare.com>,
	Ben Hutchings <bhutchings@...arflare.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH 4/9] drivers/net/sfc: Correct code taking the size of a
 pointer

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

The function efx_iterate_state contains the code
memcpy(&payload->msg, payload_msg, sizeof(payload_msg));
This is the only use of payload_msg.  The type of payload_msg is
changed from a pointer to an array, so that the result of sizeof really is
the length of the string.

A simplified version of the semantic patch that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression *x;
expression f;
type T;
@@

*f(...,(T)x,...)
// </smpl>

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

---
 drivers/net/sfc/selftest.c          |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/net/sfc/selftest.c b/drivers/net/sfc/selftest.c
index 14949bb..af39335 100644
--- a/drivers/net/sfc/selftest.c
+++ b/drivers/net/sfc/selftest.c
@@ -47,7 +47,7 @@ static const unsigned char payload_source[ETH_ALEN] = {
 	0x00, 0x0f, 0x53, 0x1b, 0x1b, 0x1b,
 };
 
-static const char *payload_msg =
+static const char payload_msg[] =
 	"Hello world! This is an Efx loopback test in progress!";
 
 /**
--
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