From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753471AbeBGIIc (ORCPT ); Wed, 7 Feb 2018 03:08:32 -0500 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:37170 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750815AbeBGIIb (ORCPT ); Wed, 7 Feb 2018 03:08:31 -0500 From: Jason Wang To: linux-kernel@vger.kernel.org, mst@redhat.com Cc: netdev@vger.kernel.org, Jason Wang Subject: [PATCH net] ptr_ring: fail early if queue occupies more than KMALLOC_MAX_SIZE Date: Wed, 7 Feb 2018 16:08:25 +0800 Message-Id: <1517990905-15737-1-git-send-email-jasowang@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org To avoid slab to warn about exceeded size, fail early if queue occupies more than KMALLOC_MAX_SIZE. Reported-by: syzbot+e4d4f9ddd4295539735d@syzkaller.appspotmail.com Signed-off-by: Jason Wang --- include/linux/ptr_ring.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/include/linux/ptr_ring.h b/include/linux/ptr_ring.h index 1883d61..4b862da 100644 --- a/include/linux/ptr_ring.h +++ b/include/linux/ptr_ring.h @@ -466,6 +466,8 @@ static inline int ptr_ring_consume_batched_bh(struct ptr_ring *r, static inline void **__ptr_ring_init_queue_alloc(unsigned int size, gfp_t gfp) { + if (size > KMALLOC_MAX_SIZE) + return NULL; return kcalloc(size, sizeof(void *), gfp); } -- 2.7.4