From: Julia Lawall <julia@diku.dk>
Date: Thu, 27 May 2010 12:33:17 +0000 (+0200)
Subject: drivers/dma: Eliminate a NULL pointer dereference
X-Git-Tag: v2.6.36-rc1~311^2~9^2
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=485680050166dc8c6ac976346430ab1f453c228b;p=pandora-kernel.git

drivers/dma: Eliminate a NULL pointer dereference

If td_desc is NULL, just skip both kfrees.

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

// <smpl>
@r exists@
expression E,E1;
identifier f;
statement S1,S2,S3;
@@

if ((E == NULL && ...) || ...)
{
  ... when != if (...) S1 else S2
      when != E = E1
* E->f
  ... when any
  return ...;
}
else S3
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---

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