[PATCH 4/6] ch: Free @iothreads array in virCHProcessSetupIOThreads()

[Michal Privoznik <mprivozn@xxxxxxxxxx>]

When the CH driver starts a domain virCHProcessSetupIOThreads()
is called eventually which in turn calls
virCHMonitorGetIOThreads(). The latter returns an array of
iothreads which is never freed leading to a memleak:

130 (104 direct, 26 indirect) bytes in 1 blocks are definitely lost in loss record 1,804 of 1,998
   at 0x484CEF3: calloc (vg_replace_malloc.c:1675)
   by 0x4F0E7A9: g_malloc0 (in /usr/lib64/libglib-2.0.so.0.8000.5)
   by 0xB3A9359: virCHMonitorGetIOThreads (ch_monitor.c:1183)
   by 0xB3AA5BB: virCHProcessSetupIOThreads (ch_process.c:348)
   by 0xB3AAC59: virCHProcessSetup (ch_process.c:480)
   by 0xB3AC75A: virCHProcessStart (ch_process.c:973)
   by 0xB39B7D4: chDomainCreateXML (ch_driver.c:246)
   by 0x4CC9D32: virDomainCreateXML (libvirt-domain.c:188)
   by 0x168F91: remoteDispatchDomainCreateXML (remote_daemon_dispatch_stubs.h:5186)
   by 0x168F18: remoteDispatchDomainCreateXMLHelper (remote_daemon_dispatch_stubs.h:5167)
   by 0x4B20066: virNetServerProgramDispatchCall (virnetserverprogram.c:423)
   by 0x4B1FB99: virNetServerProgramDispatch (virnetserverprogram.c:299)

Signed-off-by: Michal Privoznik <mprivozn@xxxxxxxxxx>
---
 src/ch/ch_process.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/ch/ch_process.c b/src/ch/ch_process.c
index 9a85f7869e..cbf98faaf0 100644
--- a/src/ch/ch_process.c
+++ b/src/ch/ch_process.c
@@ -344,6 +344,7 @@ virCHProcessSetupIOThreads(virDomainObj *vm)
     virDomainIOThreadInfo **iothreads = NULL;
     size_t i;
     int niothreads;
+    int ret = -1;
 
     if ((niothreads = virCHMonitorGetIOThreads(priv->monitor, &iothreads)) < 0)
         return -1;
@@ -351,9 +352,16 @@ virCHProcessSetupIOThreads(virDomainObj *vm)
     for (i = 0; i < niothreads; i++) {
         VIR_DEBUG("IOThread index = %zu , tid = %d", i, iothreads[i]->iothread_id);
         if (virCHProcessSetupIOThread(vm, iothreads[i]) < 0)
-            return -1;
+            goto cleanup;
     }
-    return 0;
+
+    ret = 0;
+ cleanup:
+    for (i = 0; i < niothreads; i++) {
+        virDomainIOThreadInfoFree(iothreads[i]);
+    }
+    g_free(iothreads);
+    return ret;
 }
 
 static int
-- 
2.48.1