linux-kernel - Re: [PATCH 4/5] net/netlabel: Add kmalloc NULL tests

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Message-ID: <Pine.LNX.4.64.0907301637570.8734@ask.diku.dk>
Date:	Thu, 30 Jul 2009 16:38:19 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Paul Moore <paul.moore@...com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 4/5] net/netlabel: Add kmalloc NULL tests

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

The test on map4 should be a test on map6.

The semantic match that finds this problem is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@@
expression *x;
identifier f;
constant char *C;
@@

x = \(kmalloc\|kcalloc\|kzalloc\)(...);
... when != x == NULL
    when != x != NULL
    when != (x || ...)
(
kfree(x)
|
f(...,C,...,x,...)
|
*f(...,x,...)
|
*x->f
)
// </smpl>

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

---
 net/netlabel/netlabel_kapi.c        |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/net/netlabel/netlabel_kapi.c b/net/netlabel/netlabel_kapi.c
index 3ff6f32..6ce0020 100644
--- a/net/netlabel/netlabel_kapi.c
+++ b/net/netlabel/netlabel_kapi.c
@@ -151,7 +151,7 @@ int netlbl_cfg_unlbl_map_add(const char *domain,
 			addr6 = addr;
 			mask6 = mask;
 			map6 = kzalloc(sizeof(*map6), GFP_ATOMIC);
-			if (map4 == NULL)
+			if (map6 == NULL)
 				goto cfg_unlbl_map_add_failure;
 			map6->type = NETLBL_NLTYPE_UNLABELED;
 			ipv6_addr_copy(&map6->list.addr, addr6);
--
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