[libvirt] [PATCH] conf: avoid memory leak on virDomainDefParseXML

[ajia at redhat.com]

From: Alex Jia <ajia at redhat.com>

* conf/domain_conf.c: allocate memory to def->redirdevs in 
  virDomainDefParseXML such as VIR_ALLOC_N(def->redirdevs, n),
  however, virDomainDefFree(def) hasn't released these memory.

* Detected in valgrind run:

==19820== 209 (16 direct, 193 indirect) bytes in 1 blocks are definitely lost in loss record 25 of 26
==19820==    at 0x4A04A28: calloc (vg_replace_malloc.c:467)
==19820==    by 0x4A13AF: virAllocN (memory.c:129)
==19820==    by 0x4D4A0E: virDomainDefParseXML (domain_conf.c:7258)
==19820==    by 0x4D4C93: virDomainDefParseNode (domain_conf.c:7512)
==19820==    by 0x4D562F: virDomainDefParse (domain_conf.c:7465)
==19820==    by 0x415863: testCompareXMLToXMLFiles (qemuxml2xmltest.c:35)
==19820==    by 0x415982: testCompareXMLToXMLHelper (qemuxml2xmltest.c:80)
==19820==    by 0x416D31: virtTestRun (testutils.c:140)
==19820==    by 0x415604: mymain (qemuxml2xmltest.c:192)
==19820==    by 0x416437: virtTestMain (testutils.c:689)
==19820==    by 0x3CA7A1ECDC: (below main) (in /lib64/libc-2.12.so)
==19820==
==19820== LEAK SUMMARY:
==19820==    definitely lost: 16 bytes in 1 blocks
==19820==    indirectly lost: 193 bytes in 5 blocks
==19820==      possibly lost: 0 bytes in 0 blocks
==19820==    still reachable: 1,054 bytes in 21 blocks

* How to reproduce?
% valgrind -v --leak-check=full ./tests/qemuxml2xmltest


Signed-off-by: Alex Jia <ajia at redhat.com>
---
 src/conf/domain_conf.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index ea6b581..03ab447 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -1206,6 +1206,10 @@ void virDomainDefFree(virDomainDefPtr def)
         virDomainHubDefFree(def->hubs[i]);
     VIR_FREE(def->hubs);
 
+    for (i = 0 ; i < def->nredirdevs ; i++)
+        virDomainRedirdevDefFree(def->redirdevs[i]);
+    VIR_FREE(def->redirdevs);
+
     VIR_FREE(def->os.type);
     VIR_FREE(def->os.arch);
     VIR_FREE(def->os.machine);
-- 
1.7.1