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[libvirt] [PATCH] virsh: fix memory leak in virsh when starting a guest with invalid fd



When start a guest with --pass-fd, if the argument of --pass-fd is invalid,
virsh will exit, but doesn't free the variable 'dom'.

The valgrind said:
...
==24569== 63 (56 direct, 7 indirect) bytes in 1 blocks are definitely lost in loss record 130 of 234
==24569==    at 0x4C2A1D4: calloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==24569==    by 0x4E879A4: virAllocVar (viralloc.c:544)
==24569==    by 0x4EBD625: virObjectNew (virobject.c:190)
==24569==    by 0x4F3A18A: virGetDomain (datatypes.c:226)
==24569==    by 0x4F9311F: remoteDomainLookupByName (remote_driver.c:6636)
==24569==    by 0x4F44F20: virDomainLookupByName (libvirt.c:2277)
==24569==    by 0x12F616: vshCommandOptDomainBy (virsh-domain.c:105)
==24569==    by 0x131C79: cmdStart (virsh-domain.c:3330)
==24569==    by 0x12C4AB: vshCommandRun (virsh.c:1752)
==24569==    by 0x127001: main (virsh.c:3218)

https://bugzilla.redhat.com/show_bug.cgi?id=1067338

Signed-off-by: Jincheng Miao <jmiao redhat com>
---
 tools/virsh-domain.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/virsh-domain.c b/tools/virsh-domain.c
index c3db94c..57653a2 100644
--- a/tools/virsh-domain.c
+++ b/tools/virsh-domain.c
@@ -3428,11 +3428,11 @@ cmdStart(vshControl *ctl, const vshCmd *cmd)
     if (virDomainGetID(dom) != (unsigned int)-1) {
         vshError(ctl, "%s", _("Domain is already active"));
         virDomainFree(dom);
-        return false;
+        goto cleanup;
     }
 
     if (cmdStartGetFDs(ctl, cmd, &nfds, &fds) < 0)
-        return false;
+        goto cleanup;
 
     if (vshCommandOptBool(cmd, "paused"))
         flags |= VIR_DOMAIN_START_PAUSED;
-- 
1.8.5.3


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