[libvirt PATCH] conf: Avoid NULL-dereference in virDomainObjGetMessages

[Jiri Denemark <jdenemar@xxxxxxxxxx>]

All callers currently guarantee flags passed to virDomainObjGetMessages
are either zero or contain at least one of the supported flags. But it
doesn't mean we should not check for the possibility an unknown flag was
the only one passed to virDomainObjGetMessages.

Signed-off-by: Jiri Denemark <jdenemar@xxxxxxxxxx>
---
 src/conf/domain_conf.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index ab8f2a52cc..093b719b2c 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -31472,7 +31472,8 @@ virDomainObjGetMessages(virDomainObj *vm,
         }
     }
 
-    (*msgs)[nmsgs] = NULL;
+    if (*msgs)
+        (*msgs)[nmsgs] = NULL;
 
     rv = nmsgs;
 
-- 
2.35.0