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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,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 A3064C433E1 for ; Mon, 18 May 2020 18:04:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 76AC220853 for ; Mon, 18 May 2020 18:04:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1589825076; bh=tJRGNk7SX8eNPltUjlQO5LmafLOMsO6yY9TLKgqoxrU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=j4KauFeSdUCEkilj6As/s1M3TJnXVPbijfDBMBGQMrrkox0FnPZOACYz++KPvb1yU UFbY8/5oO5swMvoMcOrxMy5z9XTcUKWbdyQRjuzxtVBlhETuIGgyWKK1+YlaeRyreb SLWjjT3B+KUuJXKq5CtKsPvzE7NnmyoYmgPIqFmI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732808AbgERSEg (ORCPT ); Mon, 18 May 2020 14:04:36 -0400 Received: from mail.kernel.org ([198.145.29.99]:51398 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732257AbgERSEX (ORCPT ); Mon, 18 May 2020 14:04:23 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.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 50FBA20715; Mon, 18 May 2020 18:04:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1589825062; bh=tJRGNk7SX8eNPltUjlQO5LmafLOMsO6yY9TLKgqoxrU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZJgIgzYzkSLqQB2QmeXxGewdgCZ1pRg6k/ki4PiCElySSyd+W8g/lUOOPrVrUAG8A k7kLa6zjLyB3EHNiYxMsPsP68uiowd18P7js4UohZaIU647ZYKRXy7Ac2L4gkQroOK SfiUw3iGg6IE9W1lde1tJPalBlPVu9L8ZuMLon6M= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jack Morgenstein , Leon Romanovsky , Jason Gunthorpe , Sasha Levin Subject: [PATCH 5.6 113/194] IB/core: Fix potential NULL pointer dereference in pkey cache Date: Mon, 18 May 2020 19:36:43 +0200 Message-Id: <20200518173541.154322083@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200518173531.455604187@linuxfoundation.org> References: <20200518173531.455604187@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jack Morgenstein [ Upstream commit 1901b91f99821955eac2bd48fe25ee983385dc00 ] The IB core pkey cache is populated by procedure ib_cache_update(). Initially, the pkey cache pointer is NULL. ib_cache_update allocates a buffer and populates it with the device's pkeys, via repeated calls to procedure ib_query_pkey(). If there is a failure in populating the pkey buffer via ib_query_pkey(), ib_cache_update does not replace the old pkey buffer cache with the updated one -- it leaves the old cache as is. Since initially the pkey buffer cache is NULL, when calling ib_cache_update the first time, a failure in ib_query_pkey() will cause the pkey buffer cache pointer to remain NULL. In this situation, any calls subsequent to ib_get_cached_pkey(), ib_find_cached_pkey(), or ib_find_cached_pkey_exact() will try to dereference the NULL pkey cache pointer, causing a kernel panic. Fix this by checking the ib_cache_update() return value. Fixes: 8faea9fd4a39 ("RDMA/cache: Move the cache per-port data into the main ib_port_data") Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Link: https://lore.kernel.org/r/20200507071012.100594-1-leon@kernel.org Signed-off-by: Jack Morgenstein Signed-off-by: Leon Romanovsky Signed-off-by: Jason Gunthorpe Signed-off-by: Sasha Levin --- drivers/infiniband/core/cache.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/infiniband/core/cache.c b/drivers/infiniband/core/cache.c index 17bfedd24cc34..4619629b958cd 100644 --- a/drivers/infiniband/core/cache.c +++ b/drivers/infiniband/core/cache.c @@ -1536,8 +1536,11 @@ int ib_cache_setup_one(struct ib_device *device) if (err) return err; - rdma_for_each_port (device, p) - ib_cache_update(device, p, true); + rdma_for_each_port (device, p) { + err = ib_cache_update(device, p, true); + if (err) + return err; + } return 0; } -- 2.20.1