setting UFN prefix to NULL should clear prefix not cause crash.

diff --git a/libraries/libldap/ufn.c b/libraries/libldap/ufn.c
index 9d215cdec999aa45eb2333482374cbee70225c60..2b8f44a6f40010ddb9520679fbe2858df8290620 100644 (file)
--- a/libraries/libldap/ufn.c
+++ b/libraries/libldap/ufn.c
@@ -478,7 +478,8 @@ ldap_ufn_setprefix( LDAP *ld, LDAP_CONST char *prefix )
        if ( ld->ld_ufnprefix != NULL )
                LDAP_FREE( ld->ld_ufnprefix );
 
-       ld->ld_ufnprefix = LDAP_STRDUP( prefix );
+       ld->ld_ufnprefix = prefix == NULL
+               ? NULL : LDAP_STRDUP( prefix );
 }
 
 int