[spice-server v2 2/2] stat: Move NULL check earlier in stat_file_add_node()

[Christophe Fergeau <cfergeau@xxxxxxxxxx>]

stat_file->stat has already been dereferenced by the time the check is
done. This commit moves it earlier, before the first dereference
attempt.
---
 server/stat-file.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/server/stat-file.c b/server/stat-file.c
index de455b6..2e9df22 100644
--- a/server/stat-file.c
+++ b/server/stat-file.c
@@ -151,6 +151,12 @@ stat_file_add_node(RedStatFile *stat_file, StatNodeRef parent, const char *name,
         return INVALID_STAT_REF;
     }
     pthread_mutex_lock(&stat_file->lock);
+
+    if ((stat_file->stat == NULL) || (strlen(name) >= sizeof(node->name))) {
+        pthread_mutex_unlock(&stat_file->lock);
+        return INVALID_STAT_REF;
+    }
+
     ref = (parent == INVALID_STAT_REF ? stat_file->stat->root_index :
                                         stat_file->stat->nodes[parent].first_child_index);
     while (ref != INVALID_STAT_REF) {
@@ -162,7 +168,7 @@ stat_file_add_node(RedStatFile *stat_file, StatNodeRef parent, const char *name,
             return ref;
         }
     }
-    if (stat_file->stat->num_of_nodes >= stat_file->max_nodes || stat_file->stat == NULL) {
+    if (stat_file->stat->num_of_nodes >= stat_file->max_nodes) {
         pthread_mutex_unlock(&stat_file->lock);
         return INVALID_STAT_REF;
     }
-- 
2.9.3

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