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

[Nehal J Wani]

This patch fixes memory leaks reported by valgrind on running qemuxml2argvtest

Most of them are of the form:

==24777== 15 bytes in 1 blocks are definitely lost in loss record 39 of 129
==24777==    at 0x4A0887C: malloc (vg_replace_malloc.c:270)
==24777==    by 0x341F485E21: strdup (strdup.c:42)
==24777==    by 0x4CADE5F: virStrdup (virstring.c:554)
==24777==    by 0x4362B6: qemuBuildDriveStr (qemu_command.c:3848)
==24777==    by 0x43EF73: qemuBuildCommandLine (qemu_command.c:8500)
==24777==    by 0x426670: testCompareXMLToArgvHelper (qemuxml2argvtest.c:350)
==24777==    by 0x427C01: virtTestRun (testutils.c:138)
==24777==    by 0x41DDB5: mymain (qemuxml2argvtest.c:658)
==24777==    by 0x4282A2: virtTestMain (testutils.c:593)
==24777==    by 0x341F421A04: (below main) (libc-start.c:225)
==24777==

---
 v2: Modified according to Eric's comments.

 src/qemu/qemu_command.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 768fdc4..9539be7 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -4063,6 +4063,7 @@ qemuBuildDriveStr(virConnectPtr conn,
 
         virBufferEscape(&opt, ',', ",", "%s,", source);
     }
+    VIR_FREE(source);
 
     if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE))
         virBufferAddLit(&opt, "if=none");
@@ -4274,6 +4275,7 @@ qemuBuildDriveStr(virConnectPtr conn,
     return virBufferContentAndReset(&opt);
 
 error:
+    VIR_FREE(source);
     virBufferFreeAndReset(&opt);
     return NULL;
 }
-- 
1.8.1.4