Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756298Ab3FDQJ7 (ORCPT ); Tue, 4 Jun 2013 12:09:59 -0400 Received: from mail-pb0-f52.google.com ([209.85.160.52]:33067 "EHLO mail-pb0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756276Ab3FDQIv (ORCPT ); Tue, 4 Jun 2013 12:08:51 -0400 From: Jiang Liu To: Greg Kroah-Hartman , Nitin Gupta , Minchan Kim , Jerome Marchand Cc: Yijing Wang , Jiang Liu , devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 06/10] zram: avoid access beyond the zram device Date: Wed, 5 Jun 2013 00:06:04 +0800 Message-Id: <1370361968-8764-6-git-send-email-jiang.liu@huawei.com> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <1370361968-8764-1-git-send-email-jiang.liu@huawei.com> References: <1370361968-8764-1-git-send-email-jiang.liu@huawei.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1000 Lines: 32 Function valid_io_request() should verify the entire request doesn't exceed the zram device, otherwise it will cause invalid memory access. Signed-off-by: Jiang Liu Cc: stable@vger.kernel.org --- drivers/staging/zram/zram_drv.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/staging/zram/zram_drv.c b/drivers/staging/zram/zram_drv.c index 6a54bb9..1c3974f 100644 --- a/drivers/staging/zram/zram_drv.c +++ b/drivers/staging/zram/zram_drv.c @@ -428,6 +428,10 @@ static inline int valid_io_request(struct zram *zram, struct bio *bio) return 0; } + if (unlikely((bio->bi_sector << SECTOR_SHIFT) + bio->bi_size >= + zram->disksize)) + return 0; + /* I/O request is valid */ return 1; } -- 1.8.1.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/