From patchwork Mon Jan 18 11:34:11 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 365992 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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 5F4B0C433E9 for ; Mon, 18 Jan 2021 19:16:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2B361227C3 for ; Mon, 18 Jan 2021 19:16:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390467AbhARTP7 (ORCPT ); Mon, 18 Jan 2021 14:15:59 -0500 Received: from mail.kernel.org ([198.145.29.99]:33332 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390454AbhARLiY (ORCPT ); Mon, 18 Jan 2021 06:38:24 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 8435C224B0; Mon, 18 Jan 2021 11:37:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1610969857; bh=velFEvr9vGZQoXrs7U56Ggklq13fpI3OW3qX4bLkrGU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=uoQCaJhR0aMIhHnesV/JawZEGxIPauSry74PYVttCougenbsTnvtrLUriiSTf4NBE CGx43Ts8jrR+ZZFHyCOotsUnF4lOlVp5SfkGf/fIW0TZ1p4HBALUaIjB9JGrr2tCkE C8atYKm/9L+E5eW26X0cmnRsmLMhsK0mStjz1890= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Tom Rix , Leon Romanovsky , Jason Gunthorpe Subject: [PATCH 5.4 11/76] RDMA/ocrdma: Fix use after free in ocrdma_dealloc_ucontext_pd() Date: Mon, 18 Jan 2021 12:34:11 +0100 Message-Id: <20210118113341.529435390@linuxfoundation.org> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20210118113340.984217512@linuxfoundation.org> References: <20210118113340.984217512@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Tom Rix commit f2bc3af6353cb2a33dfa9d270d999d839eef54cb upstream. In ocrdma_dealloc_ucontext_pd() uctx->cntxt_pd is assigned to the variable pd and then after uctx->cntxt_pd is freed, the variable pd is passed to function _ocrdma_dealloc_pd() which dereferences pd directly or through its call to ocrdma_mbx_dealloc_pd(). Reorder the free using the variable pd. Cc: stable@vger.kernel.org Fixes: 21a428a019c9 ("RDMA: Handle PD allocations by IB/core") Link: https://lore.kernel.org/r/20201230024653.1516495-1-trix@redhat.com Signed-off-by: Tom Rix Reviewed-by: Leon Romanovsky Signed-off-by: Jason Gunthorpe Signed-off-by: Greg Kroah-Hartman --- drivers/infiniband/hw/ocrdma/ocrdma_verbs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c +++ b/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c @@ -442,9 +442,9 @@ static void ocrdma_dealloc_ucontext_pd(s pr_err("%s(%d) Freeing in use pdid=0x%x.\n", __func__, dev->id, pd->id); } - kfree(uctx->cntxt_pd); uctx->cntxt_pd = NULL; _ocrdma_dealloc_pd(dev, pd); + kfree(pd); } static struct ocrdma_pd *ocrdma_get_ucontext_pd(struct ocrdma_ucontext *uctx)