linux-kernel - [PATCH 5/5] staging/otus: Move a dereference below a NULL test

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <Pine.LNX.4.64.0907110950510.29592@ask.diku.dk>
Date:	Sat, 11 Jul 2009 09:51:14 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	gregkh@...e.de, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 5/5] staging/otus: Move a dereference below a NULL test

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

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>

---
 drivers/staging/otus/wwrap.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff -u -p a/drivers/staging/otus/wwrap.c b/drivers/staging/otus/wwrap.c
--- a/drivers/staging/otus/wwrap.c
+++ b/drivers/staging/otus/wwrap.c
@@ -1016,12 +1016,13 @@ void kevent(struct work_struct *work)
 {
     struct usbdrv_private *macp =
                container_of(work, struct usbdrv_private, kevent);
-    zdev_t *dev = macp->device;
+    zdev_t *dev;
 
     if (macp == NULL)
     {
         return;
     }
+    dev = macp->device;
 
     if (test_and_set_bit(0, (void *)&smp_kevent_Lock))
     {
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/