diff --git a/client/mysql_upgrade.c b/client/mysql_upgrade.c
index 15fa6622f74..74e8c9dd577 100644
--- a/client/mysql_upgrade.c
+++ b/client/mysql_upgrade.c
@@ -364,7 +364,9 @@ static void find_tool(char *tool_executable_name, const char *tool_name,
   }
   else
   {
-    /* 
+    int len;
+
+    /*
       mysql_upgrade was run absolutely or relatively.  We can find a sibling
       by replacing our name after the LIBCHAR with the new tool name.
     */
@@ -385,10 +387,10 @@ static void find_tool(char *tool_executable_name, const char *tool_name,
       last_fn_libchar -= 6;
     }
 
+    len= last_fn_libchar - self_name;
+
     my_snprintf(tool_executable_name, FN_REFLEN, "%.*s%c%s",
-             (last_fn_libchar - self_name), self_name, 
-             FN_LIBCHAR,
-             tool_name);
+                len, self_name, FN_LIBCHAR, tool_name);
   }
 
   verbose("Looking for '%s' as: %s", tool_name, tool_executable_name);
diff --git a/mysys/mf_keycache.c b/mysys/mf_keycache.c
index f27ade7bfc0..0720d172317 100644
--- a/mysys/mf_keycache.c
+++ b/mysys/mf_keycache.c
@@ -1382,7 +1382,7 @@ restart:
       /* We don't need the page in the cache: we are going to write on disk */
       hash_link->requests--;
       unlink_hash(keycache, hash_link);
-      return 0;
+      DBUG_RETURN(0);
     }
     if (!(block->status & BLOCK_IN_FLUSH))
     {
@@ -1399,7 +1399,7 @@ restart:
         flag (see the code below that handles reading requests).
       */
       free_block(keycache, block);
-      return 0;
+      DBUG_RETURN(0);
     }
     /* Wait intil the page is flushed on disk */
     hash_link->requests--;
@@ -1429,7 +1429,7 @@ restart:
     /* Invalidate page in the block if it has not been done yet */
     if (block->status)
       free_block(keycache, block);
-    return 0;
+    DBUG_RETURN(0);
   }
 
   if (page_status == PAGE_READ &&
diff --git a/sql/sql_cursor.cc b/sql/sql_cursor.cc
index c2345f1f2cd..16567765ba6 100644
--- a/sql/sql_cursor.cc
+++ b/sql/sql_cursor.cc
@@ -111,7 +111,8 @@ class Select_materialize: public select_union
   select_result *result; /* the result object of the caller (PS or SP) */
 public:
   Materialized_cursor *materialized_cursor;
-  Select_materialize(select_result *result_arg) :result(result_arg) {}
+  Select_materialize(select_result *result_arg) :result(result_arg),
+    materialized_cursor(0) {}
   virtual bool send_fields(List<Item> &list, uint flags);
 };
 
@@ -155,6 +156,7 @@ int mysql_open_cursor(THD *thd, uint flags, select_result *result,
   if (! (sensitive_cursor= new (thd->mem_root) Sensitive_cursor(thd, result)))
   {
     delete result_materialize;
+    result_materialize= NULL;
     return 1;
   }
 
@@ -212,6 +214,7 @@ int mysql_open_cursor(THD *thd, uint flags, select_result *result,
     if ((rc= materialized_cursor->open(0)))
     {
       delete materialized_cursor;
+      materialized_cursor= NULL;
       goto err_open;
     }
 
diff --git a/tests/mysql_client_test.c b/tests/mysql_client_test.c
index 5e1c2afe84a..4336bfa0c59 100644
--- a/tests/mysql_client_test.c
+++ b/tests/mysql_client_test.c
@@ -16189,6 +16189,35 @@ static void test_bug32265()
   DBUG_VOID_RETURN;
 }
 
+
+/**
+  Bug#38486 Crash when using cursor protocol
+*/
+
+static void test_bug38486(void)
+{
+    myheader("test_bug38486");
+    
+    MYSQL_STMT *stmt;
+    stmt= mysql_stmt_init(mysql);
+    unsigned long type= CURSOR_TYPE_READ_ONLY;
+    mysql_stmt_attr_set(stmt, STMT_ATTR_CURSOR_TYPE, (void*)&type);
+    const char *sql= "CREATE TABLE t1 (a INT)";
+    mysql_stmt_prepare(stmt,sql,strlen(sql));
+    
+    mysql_stmt_execute(stmt);
+    mysql_stmt_close(stmt);
+    
+    stmt= mysql_stmt_init(mysql);
+    mysql_stmt_attr_set(stmt, STMT_ATTR_CURSOR_TYPE, (void*)&type);
+    const char *sql2= "INSERT INTO t1 VALUES (1)";
+    mysql_stmt_prepare(stmt,sql2,strlen(sql2));
+    mysql_stmt_execute(stmt);
+    
+    mysql_stmt_close(stmt);
+}
+
+
 /*
   Read and parse arguments and MySQL options from my.cnf
 */
@@ -16483,6 +16512,7 @@ static struct my_tests_st my_tests[]= {
   { "test_bug29306", test_bug29306 },
   { "test_bug31669", test_bug31669 },
   { "test_bug32265", test_bug32265 },
+  { "test_bug38486", test_bug38486 },
   { 0, 0 }
 };