From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 18DC8C43444 for ; Mon, 7 Jan 2019 13:26:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D3D2F21855 for ; Mon, 7 Jan 2019 13:26:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1546867570; bh=a1kPk8+4G4mMKkTrSpwpHyvHI8Vz5X+3mzmIR+CVpwQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=j3LDlr/jauS8dMSNjnQwyss8SPVkSC2D8L2fcG2s2ujk4z7HuEbJmTyVGOkMJlnhI ljlLeORQF3bndC4Atn0gBT9vU9XaWsjanV3wA/7G97pjQzR6UNGVBHJF2IXAtGR6Xb Ophu9VE9+WB9FvRruSavxXxqsBdHRT0IOLhw7Pj4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727234AbfAGMe3 (ORCPT ); Mon, 7 Jan 2019 07:34:29 -0500 Received: from mail.kernel.org ([198.145.29.99]:46674 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727215AbfAGMeZ (ORCPT ); Mon, 7 Jan 2019 07:34:25 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 19C6E217D4; Mon, 7 Jan 2019 12:34:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1546864464; bh=a1kPk8+4G4mMKkTrSpwpHyvHI8Vz5X+3mzmIR+CVpwQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=N5kUKM1tZppWESM4v/x7oYpAhwgph6sCjT9D8WrhmhDYaBrsDtTP4uPmTdA6qLulb e7VoEUCJF9RI5h3oZd0buYO4V0MzEQOJM3eAbLqaCZ2e1JGPBOUNVxn2amQ5n41X64 wTurLWWCV7Qc0O0HbXkZA8gpDOe9Xi/wBs19FO2Y= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mike Marciniszyn , "Michael J. Ruhl" , Dennis Dalessandro , Jason Gunthorpe Subject: [PATCH 4.20 020/145] IB/hfi1: Incorrect sizing of sge for PIO will OOPs Date: Mon, 7 Jan 2019 13:30:57 +0100 Message-Id: <20190107104439.886060440@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190107104437.308206189@linuxfoundation.org> References: <20190107104437.308206189@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org 4.20-stable review patch. If anyone has any objections, please let me know. ------------------ From: Michael J. Ruhl commit dbc2970caef74e8ff41923d302aa6fb5a4812d0e upstream. An incorrect sge sizing in the HFI PIO path will cause an OOPs similar to this: BUG: unable to handle kernel NULL pointer dereference at (null) IP: [] hfi1_verbs_send_pio+0x3d8/0x530 [hfi1] PGD 0 Oops: 0000 1 SMP Call Trace: ? hfi1_verbs_send_dma+0xad0/0xad0 [hfi1] hfi1_verbs_send+0xdf/0x250 [hfi1] ? make_rc_ack+0xa80/0xa80 [hfi1] hfi1_do_send+0x192/0x430 [hfi1] hfi1_do_send_from_rvt+0x10/0x20 [hfi1] rvt_post_send+0x369/0x820 [rdmavt] ib_uverbs_post_send+0x317/0x570 [ib_uverbs] ib_uverbs_write+0x26f/0x420 [ib_uverbs] ? security_file_permission+0x21/0xa0 vfs_write+0xbd/0x1e0 ? mntput+0x24/0x40 SyS_write+0x7f/0xe0 system_call_fastpath+0x16/0x1b Fix by adding the missing sizing check to correctly determine the sge length. Fixes: 7724105686e7 ("IB/hfi1: add driver files") Reviewed-by: Mike Marciniszyn Signed-off-by: Michael J. Ruhl Signed-off-by: Dennis Dalessandro Signed-off-by: Jason Gunthorpe Signed-off-by: Greg Kroah-Hartman --- drivers/infiniband/hw/hfi1/verbs.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/infiniband/hw/hfi1/verbs.c +++ b/drivers/infiniband/hw/hfi1/verbs.c @@ -919,6 +919,8 @@ int hfi1_verbs_send_pio(struct rvt_qp *q if (slen > len) slen = len; + if (slen > ss->sge.sge_length) + slen = ss->sge.sge_length; rvt_update_sge(ss, slen, false); seg_pio_copy_mid(pbuf, addr, slen); len -= slen;