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Subject: possible double free in edac_mc_alloc()
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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@linux.intel.com> Intel Corporation


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