From 93ea4f29a4cbacf0e849c320b47c550a874c471a Mon Sep 17 00:00:00 2001
From: Daniel Black <daniel@mariadb.org>
Date: Tue, 1 Apr 2025 16:40:30 +1100
Subject: [PATCH] MDEV-36347 UBSAN: plugins.auth_v0100 - runtime error: call to
 function do_auth_0x0100

through pointer to incorrect function type.

Redoing a new plugin interface for an obsolete protocol was
too much so we just remove the UBSAN testing on the function.

It wasn't possible to just disable funtion-type-mismatch
---
 plugin/auth_examples/auth_0x0100.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/plugin/auth_examples/auth_0x0100.c b/plugin/auth_examples/auth_0x0100.c
index e23f495f43b..e0639dddf90 100644
--- a/plugin/auth_examples/auth_0x0100.c
+++ b/plugin/auth_examples/auth_0x0100.c
@@ -56,6 +56,10 @@ struct st_mysql_auth
 };
 #endif
 
+/* function-type-mismatch ignore */
+#if defined(__clang__)
+__attribute__((no_sanitize("undefined")))
+#endif
 static int do_auth_0x0100(MYSQL_PLUGIN_VIO *vio, MYSQL_SERVER_AUTH_INFO *info)
 {
   info->password_used= 1;