MDEV-29706 : SIGSEGV in wsrep_TOI_begin on non-Galera builds

Do not allow setting wsrep_on=ON if no provider is set.

1 files changed, 6 insertions, 0 deletions

diff --git a/sql/wsrep_var.cc b/sql/wsrep_var.cc
index 413550935cb..ea8db8addab 100644
--- a/sql/wsrep_var.cc
+++ b/sql/wsrep_var.cc
@@ -70,6 +70,12 @@ bool wsrep_on_check(sys_var *self, THD* thd, set_var* var)
 	    " innodb_lock_schedule_algorithm=FCFS and restart.", MYF(0));
     return true;
   }
+  if (new_wsrep_on && !WSREP_PROVIDER_EXISTS)
+  {
+    my_message(ER_WRONG_ARGUMENTS, "WSREP (galera) can't be enabled "
+               "if the wsrep_provider is unset or set to 'none'", MYF(0));
+    return true;
+  }
   return false;
 }