linux-kernel - [PATCH 11/11] net/bridge/netfilter: Move a dereference below a NULL test

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Date:	Tue, 16 Dec 2008 16:15:53 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	kaber@...sh.net, netfilter-devel@...r.kernel.org,
	netfilter@...r.kernel.org, coreteam@...filter.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 11/11] net/bridge/netfilter: Move a dereference below a NULL
 test

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

In each case, if the NULL test is necessary, then the dereference should be
moved below the NULL test.

The semantic patch that makes this change is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@@
type T;
expression E;
identifier i,fld;
statement S;
@@

- T i = E->fld;
+ T i;
  ... when != E
      when != i
  if (E == NULL) S
+ i = E->fld;
// </smpl>

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

---
 net/bridge/netfilter/ebtables.c     |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index 0fa208e..1616884 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -86,12 +86,13 @@ static inline int ebt_do_match (struct ebt_entry_match *m,
 static inline int ebt_dev_check(char *entry, const struct net_device *device)
 {
 	int i = 0;
-	const char *devname = device->name;
+	const char *devname;
 
 	if (*entry == '\0')
 		return 0;
 	if (!device)
 		return 1;
+	devname = device->name;
 	/* 1 is the wildcard token */
 	while (entry[i] != '\0' && entry[i] != 1 && entry[i] == devname[i])
 		i++;
--
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