[libvirt] [PATCH] Fix crash accessing a NULL URI when looking up auth credentials

[Daniel P. Berrange]

From: "Daniel P. Berrange" <berrange at redhat.com>

When auto-probing hypervisor drivers, the conn->uri field will
initially be NULL. Care must be taken not to access members
when doing auth lookups in the config file
---
 src/remote/remote_driver.c | 2 +-
 src/util/virauth.c         | 2 +-
 src/util/viruri.h          | 2 ++
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/remote/remote_driver.c b/src/remote/remote_driver.c
index cf1f079..8c6c807 100644
--- a/src/remote/remote_driver.c
+++ b/src/remote/remote_driver.c
@@ -3281,7 +3281,7 @@ static int remoteAuthFillFromConfig(virConnectPtr conn,
 
         if (virAuthConfigLookup(state->config,
                                 "libvirt",
-                                conn->uri->server,
+                                VIR_URI_SERVER(conn->uri),
                                 credname,
                                 &value) < 0)
             goto cleanup;
diff --git a/src/util/virauth.c b/src/util/virauth.c
index 5539c3c..ff8d0d4 100644
--- a/src/util/virauth.c
+++ b/src/util/virauth.c
@@ -130,7 +130,7 @@ virAuthGetCredential(virConnectPtr conn,
 
     if (virAuthConfigLookup(config,
                             servicename,
-                            conn->uri->server,
+                            VIR_URI_SERVER(conn->uri),
                             credname,
                             &tmp) < 0)
         goto cleanup;
diff --git a/src/util/viruri.h b/src/util/viruri.h
index 571bf3c..de927fa 100644
--- a/src/util/viruri.h
+++ b/src/util/viruri.h
@@ -60,4 +60,6 @@ char *virURIFormatParams(virURIPtr uri);
 
 void virURIFree(virURIPtr uri);
 
+#define VIR_URI_SERVER(uri) ((uri) && (uri)->server ? (uri)->server : "localhost")
+
 #endif /* __VIR_URI_H__ */
-- 
1.7.11.4