util: identity: Harden virIdentitySetCurrent()

Don't unref the old identity unless we set the new one correctly and
unref the new one on failure to set it so that we don't leak any
references or use invalid pointers.

(cherry picked from commit ad886fa6c8ebc321a0386a75c187d315111cf1f3)

1 files changed, 3 insertions, 1 deletions

diff --git a/src/util/viridentity.c b/src/util/viridentity.c
index 6f3baeeb11..9b8ba4ae24 100644
--- a/src/util/viridentity.c
+++ b/src/util/viridentity.c
@@ -111,15 +111,17 @@ int virIdentitySetCurrent(virIdentityPtr ident)
         return -1;
 
     old = virThreadLocalGet(&virIdentityCurrent);
-    virObjectUnref(old);
 
     if (virThreadLocalSet(&virIdentityCurrent,
                           virObjectRef(ident)) < 0) {
         virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                        _("Unable to set thread local identity"));
+        virObjectUnref(ident);
         return -1;
     }
 
+    virObjectUnref(old);
+
     return 0;
 }