[PATCH v2] qemuDomainGetGuestInfo: Exit early if getting info fails

[Michal Privoznik]

If there is an error getting info from guest agent, then the
control on qemuDomainGetGuestInfo() jumps onto 'exitagent' label
and subsequently continues on 'endagentjob'. Both labels are hit
also in success case too. The control then continues by
attempting to match fetched info (e.g. disk addresses) with
domain def. But this is needless - the API will return error
regardless.

To return early from the function move both 'exitagent' and
'endagentjob' labels at the end of the function and jump straight
onto 'cleanup' afterwards. This allows us to set 'ret = 0' later
- only when we know we succeeded.

Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
---

v2 of:

https://www.redhat.com/archives/libvir-list/2020-December/msg00020.html

 src/qemu/qemu_driver.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 8eaa3ce68f..bca1c84630 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -20116,12 +20116,7 @@ qemuDomainGetGuestInfo(virDomainPtr dom,
         }
     }
 
-    ret = 0;
-
- exitagent:
     qemuDomainObjExitAgent(vm, agent);
-
- endagentjob:
     qemuDomainObjEndAgentJob(vm);
 
     if (nfs > 0 || ndisks > 0) {
@@ -20143,6 +20138,8 @@ qemuDomainGetGuestInfo(virDomainPtr dom,
         qemuDomainObjEndJob(driver, vm);
     }
 
+    ret = 0;
+
  cleanup:
     for (i = 0; i < nfs; i++)
         qemuAgentFSInfoFree(agentfsinfo[i]);
@@ -20153,6 +20150,13 @@ qemuDomainGetGuestInfo(virDomainPtr dom,
 
     virDomainObjEndAPI(&vm);
     return ret;
+
+ exitagent:
+    qemuDomainObjExitAgent(vm, agent);
+
+ endagentjob:
+    qemuDomainObjEndAgentJob(vm);
+    goto cleanup;
 }
 
 
-- 
2.26.2