From: Julia Lawall <julia@diku.dk>
Date: Fri, 7 Aug 2009 07:00:34 +0000 (+0200)
Subject: powerpc/fsl_rio: Add kmalloc NULL tests
X-Git-Tag: v2.6.32-rc1~675^2~76
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6c75933c00049bee59562a18843a4f133ec2bfe4;p=pandora-kernel.git

powerpc/fsl_rio: Add kmalloc NULL tests

Check that the result of kmalloc/kzalloc is not NULL before dereferencing it.

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

// <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@diku.dk>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---

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