From patchwork Wed May 20 23:01:51 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chaitanya Kulkarni X-Patchwork-Id: 11561685 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id CA55360D for ; Wed, 20 May 2020 23:02:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B280F20884 for ; Wed, 20 May 2020 23:02:02 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=wdc.com header.i=@wdc.com header.b="aUOolwmg" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728690AbgETXCC (ORCPT ); Wed, 20 May 2020 19:02:02 -0400 Received: from esa3.hgst.iphmx.com ([216.71.153.141]:7017 "EHLO esa3.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728648AbgETXCB (ORCPT ); Wed, 20 May 2020 19:02:01 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1590015722; x=1621551722; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=bWMZiFoqSUL/3acCdJU4JlzT00LV/k5w2vpIEvv48ug=; b=aUOolwmgoE0V7rc6LNGzSM5W0Je6hpjvpXTGCFOtiOfWWuWZuuFzg6qU dQTe6QuqdnXDNMcLh1th7+0moiEps7oGwhw1/u5L3UovcyF8/sGPAbSQT G22RVVALQs2/+PM3HrTkQtPEeDZeYP5uI3NWijU1+IRXGWDH+gVgEKa87 h2TdgHPH3QIJzHC9VGsqgrV4Y45tEp3cOzZ4duRqpbi72MQnFuNMcM8li p5uXqS33939pWIs6aE4MC24UXxWGp5Hq4D2+fDmWDed/Lz+5gKUXpuur9 vqd7PSefWbB7yqzOtUEhcTDJ8aT4bIs9fxRSyuDtMEzHFyt2Ek0giDRBO g==; IronPort-SDR: AhoI9/ycKpW4vnDlFfagplDPfEzEc7zDB32MbLzu2MZ63dTpRwxmOv5yUDRzh97fwmxHlx6z+v 7aAM8iVXrOr5spM+iz7ULh96qvNXstNL1EJcg+DS5Ta8FGkR9hCSE1r18arxRkrrrMaW3CNGIM UNRY3CvNVjXcyy83ks/XzLwXVTQMXF39gaZ69cRe4TdGP7ID6LlCwUm5ysOyNAqcTyiNFgmMd1 DELs6ymruGBZI8+QL7G+Bqn1ZT9vOZYYWdh5BODGCkhOGXNLUzkz1IDEpQaosBP8AvA0CbUEIZ 1mE= X-IronPort-AV: E=Sophos;i="5.73,415,1583164800"; d="scan'208";a="142501782" Received: from uls-op-cesaip02.wdc.com (HELO uls-op-cesaep02.wdc.com) ([199.255.45.15]) by ob1.hgst.iphmx.com with ESMTP; 21 May 2020 07:02:02 +0800 IronPort-SDR: jnFY+/w9Qwg2Shfm5lbaDMIHheOEtXfyAoWU2+o+t5lwQdRWQUJEIliIknTgz8jNZzZ85JQkZi yDEr1v3U2bikMOEDVlme4AyZ4BHxrVv5o= Received: from uls-op-cesaip01.wdc.com ([10.248.3.36]) by uls-op-cesaep02.wdc.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 May 2020 15:51:30 -0700 IronPort-SDR: SEE2uupmrcZbQopvI+kjFc/eujRT2nmhF72H62hHzIv4JHfJdJVFRcCxqxOmprLUGRKi94xNoT /6Vc/miTcppg== WDCIronportException: Internal Received: from iouring.labspan.wdc.com (HELO iouring.sc.wdc.com) ([10.6.138.107]) by uls-op-cesaip01.wdc.com with ESMTP; 20 May 2020 16:02:01 -0700 From: Chaitanya Kulkarni To: axboe@kernel.dk Cc: linux-block@vger.kernel.org, Chaitanya Kulkarni Subject: [PATCH 1/2] null_blk: return error for invalid zone size Date: Wed, 20 May 2020 16:01:51 -0700 Message-Id: <20200520230152.36120-2-chaitanya.kulkarni@wdc.com> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20200520230152.36120-1-chaitanya.kulkarni@wdc.com> References: <20200520230152.36120-1-chaitanya.kulkarni@wdc.com> MIME-Version: 1.0 Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org In null_init_zone_dev() check if the zone size is larger than device capacity, return error if needed. This also fixes the following oops :- null_blk: changed the number of conventional zones to 4294967295 BUG: kernel NULL pointer dereference, address: 0000000000000010 PGD 7d76c5067 P4D 7d76c5067 PUD 7d240c067 PMD 0 Oops: 0002 [#1] SMP NOPTI CPU: 4 PID: 5508 Comm: nullbtests.sh Tainted: G OE 5.7.0-rc4lblk-fnext0 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-59-gc9ba5276e4 RIP: 0010:null_init_zoned_dev+0x17a/0x27f [null_blk] RSP: 0018:ffffc90007007e00 EFLAGS: 00010246 RAX: 0000000000000020 RBX: ffff8887fb3f3c00 RCX: 0000000000000007 RDX: 0000000000000000 RSI: ffff8887ca09d688 RDI: ffff888810fea510 RBP: 0000000000000010 R08: ffff8887ca09d688 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8887c26e8000 R13: ffffffffa05e9390 R14: 0000000000000000 R15: 0000000000000001 FS: 00007fcb5256f740(0000) GS:ffff888810e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000010 CR3: 000000081e8fe000 CR4: 00000000003406e0 Call Trace: null_add_dev+0x534/0x71b [null_blk] nullb_device_power_store.cold.41+0x8/0x2e [null_blk] configfs_write_file+0xe6/0x150 vfs_write+0xba/0x1e0 ksys_write+0x5f/0xe0 do_syscall_64+0x60/0x250 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x7fcb51c71840 Signed-off-by: Chaitanya Kulkarni Reviewed-by: Damien Le Moal --- drivers/block/null_blk_zoned.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/block/null_blk_zoned.c b/drivers/block/null_blk_zoned.c index 9c19f747f394..cc47606d8ffe 100644 --- a/drivers/block/null_blk_zoned.c +++ b/drivers/block/null_blk_zoned.c @@ -23,6 +23,10 @@ int null_init_zoned_dev(struct nullb_device *dev, struct request_queue *q) pr_err("zone_size must be power-of-two\n"); return -EINVAL; } + if (dev->zone_size > dev->size) { + pr_err("Zone size larger than device capacity\n"); + return -EINVAL; + } dev->zone_size_sects = dev->zone_size << ZONE_SIZE_SHIFT; dev->nr_zones = dev_size >>