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Message-ID: <20120809135416.GA13100@localhost>
Date:	Thu, 9 Aug 2012 21:54:16 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Mauro Carvalho Chehab <mchehab@...hat.com>
Cc:	Dave Peterson <dsp@...l.gov>, kernel-janitors@...r.kernel.org,
	Doug Thompson <dougthompson@...ssion.com>,
	linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org

Subject: possible double free in edac_mc_alloc()
Reply-To: 
User-Agent: Heirloom mailx 12.5 6/20/10

Hi,

coccinelle warns about:

+ drivers/edac/edac_mc.c:429:9-23: ERROR: reference preceded by free on line 429

and that line does look strange: the 'i' seems like a temporary value
used in previous loops, and it won't change at all in the current
loop. Which means the same mci->csrows[i] get freed once and again.
It might also do double free for the previous kfree(csr) line.

vim +429 drivers/edac/edac_mc.c

   416         if (mci->dimms) {
   417                 for (i = 0; i < tot_dimms; i++)
   418                         kfree(mci->dimms[i]);
   419                 kfree(mci->dimms);
   420         }
   421         if (mci->csrows) {
   422                 for (chn = 0; chn < tot_channels; chn++) {
   423                         csr = mci->csrows[chn];
   424                         if (csr) {
   425                                 for (chn = 0; chn < tot_channels; chn++)
   426						kfree(csr->channels[chn]);
   427					kfree(csr);
   428				}
 > 429				kfree(mci->csrows[i]);
   430			}
   431			kfree(mci->csrows);
   432		}

---
0-DAY kernel build testing backend         Open Source Technology Centre
Fengguang Wu <wfg@...ux.intel.com>                     Intel Corporation
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