[PATCH] mail-storage.c: check against NULL address in strcmp() invocation

[Michal Soltys]

Configurations with multiple shared namespaces can trigger a bug
where the first argument of strcmp() invocation is NULL.

This patch adds an explicit check, analogously to how the second
argument is sanitized.
---
 src/lib-storage/mail-storage.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/lib-storage/mail-storage.c b/src/lib-storage/mail-storage.c
index 1d9b1bf..3d9f5dc 100644
--- a/src/lib-storage/mail-storage.c
+++ b/src/lib-storage/mail-storage.c
@@ -282,7 +282,7 @@ mail_storage_match_class(struct mail_storage *storage,
 		return FALSE;
 
 	if ((storage->class_flags & MAIL_STORAGE_CLASS_FLAG_UNIQUE_ROOT) != 0 &&
-	    strcmp(storage->unique_root_dir,
+	    strcmp((storage->unique_root_dir != NULL ? storage->unique_root_dir : ""),
 	    	(set->root_dir != NULL ? set->root_dir : "")) != 0)
 		return FALSE;
 
-- 
2.1.3