[libvirt] [PATCH v2] Fix memory leak in virNWFilterDefParseXML()

Daniel Veillard veillard at redhat.com
Mon Dec 2 02:42:35 UTC 2013


On Fri, Nov 29, 2013 at 08:58:51PM +0530, Nehal J Wani wrote:
> While running nwfilterxml2xmltest, it was found that valgrind pointed out the
> following error...
> 
> ==7466== 16 bytes in 1 blocks are definitely lost in loss record 26 of 90
> ==7466==    at 0x4A06B6F: calloc (vg_replace_malloc.c:593)
>     ==7466==    by 0x4C651AD: virAlloc (viralloc.c:142)
>     ==7466==    by 0x4D0450D: virNWFilterDefParseNode (nwfilter_conf.c:2575)
>     ==7466==    by 0x4D05D84: virNWFilterDefParse (nwfilter_conf.c:2647)
>     ==7466==    by 0x401FDE: testCompareXMLToXMLHelper (nwfilterxml2xmltest.c:39)
>     ==7466==    by 0x402DE1: virtTestRun (testutils.c:138)
>     ==7466==    by 0x4018E9: mymain (nwfilterxml2xmltest.c:111)
>     ==7466==    by 0x403482: virtTestMain (testutils.c:593)
>     ==7466==    by 0x341F421A04: (below main) (libc-start.c:225)
> 
> ...21 times, which are related to 21 tests in nwfilterxml2xmltest.c which sent
> EXPECT_WARN = false. There were two scenarios in virNWFilterDefParseXML(),
> when the variable 'entry' was malloc'ed, but not freed.
> 
> ---
>  src/conf/nwfilter_conf.c | 12 ++++++++----
>  1 file changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/src/conf/nwfilter_conf.c b/src/conf/nwfilter_conf.c
> index 793cb0e..d280df5 100644
> --- a/src/conf/nwfilter_conf.c
> +++ b/src/conf/nwfilter_conf.c
> @@ -2576,21 +2576,25 @@ virNWFilterDefParseXML(xmlXPathContextPtr ctxt) {
>                  goto cleanup;
>  
>              if (xmlStrEqual(curr->name, BAD_CAST "rule")) {
> -                if (!(entry->rule = virNWFilterRuleParse(curr)))
> +                if (!(entry->rule = virNWFilterRuleParse(curr))) {
> +                    virNWFilterEntryFree(entry);
>                      goto cleanup;
> +                }
>              } else if (xmlStrEqual(curr->name, BAD_CAST "filterref")) {
> -                if (!(entry->include = virNWFilterIncludeParse(curr)))
> +                if (!(entry->include = virNWFilterIncludeParse(curr))) {
> +                    virNWFilterEntryFree(entry);
>                      goto cleanup;
> +                }
>              }
>  
>              if (entry->rule || entry->include) {
>                  if (VIR_REALLOC_N(ret->filterEntries, ret->nentries+1) < 0) {
> -                    VIR_FREE(entry);
> +                    virNWFilterEntryFree(entry);
>                      goto cleanup;
>                  }
>                  ret->filterEntries[ret->nentries++] = entry;
>              } else
> -                VIR_FREE(entry);
> +                virNWFilterEntryFree(entry);
>          }
>          curr = curr->next;
>      }

  ACK, looks sane and what was suggested in v1,

   pushed, thanks !

Daniel

-- 
Daniel Veillard      | Open Source and Standards, Red Hat
veillard at redhat.com  | libxml Gnome XML XSLT toolkit  http://xmlsoft.org/
http://veillard.com/ | virtualization library  http://libvirt.org/




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