!1640 [sync] PR-1551: ksmbd: allocate one more byte for implied bcc[0

Merge Pull Request from: @openeuler-sync-bot 
 

Origin pull request: 
https://gitee.com/openeuler/kernel/pulls/1551 
 
PR sync from: Li Nan <linan122@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/ZPU6DOWXQ62ZYWCTSJSULWSJFG2MUIKX/ 
 
https://gitee.com/openeuler/kernel/issues/I7LU2I 
 
Link:https://gitee.com/openeuler/kernel/pulls/1640 

Reviewed-by: Jialin Zhang <zhangjialin11@huawei.com> 
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com> 

fs/ksmbd/connection.c

@@ -309,7 +309,8 @@ int ksmbd_conn_handler_loop(void *p)
 		}
 
 		/* 4 for rfc1002 length field */
-		size = pdu_size + 4;
+		/* 1 for implied bcc[0] */
+		size = pdu_size + 4 + 1;
 		conn->request_buf = kvmalloc(size, GFP_KERNEL);
 		if (!conn->request_buf)
 			continue;