From patchwork Tue Jul 14 14:54:56 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yang Yingliang X-Patchwork-Id: 11661557 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 340E8913 for ; Tue, 14 Jul 2020 06:56:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 25349221F2 for ; Tue, 14 Jul 2020 06:56:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726477AbgGNG4E (ORCPT ); Tue, 14 Jul 2020 02:56:04 -0400 Received: from szxga07-in.huawei.com ([45.249.212.35]:44482 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726472AbgGNG4E (ORCPT ); Tue, 14 Jul 2020 02:56:04 -0400 Received: from DGGEMS404-HUB.china.huawei.com (unknown [172.30.72.58]) by Forcepoint Email with ESMTP id 56F551B72338A2EF7613; Tue, 14 Jul 2020 14:55:58 +0800 (CST) Received: from huawei.com (10.175.124.27) by DGGEMS404-HUB.china.huawei.com (10.3.19.204) with Microsoft SMTP Server id 14.3.487.0; Tue, 14 Jul 2020 14:55:55 +0800 From: Yang Yingliang To: , CC: , , , , Subject: [PATCH stable-4.19] IB/umem: fix reference count leak in ib_umem_odp_get() Date: Tue, 14 Jul 2020 14:54:56 +0000 Message-ID: <20200714145456.1380987-1-yangyingliang@huawei.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Originating-IP: [10.175.124.27] X-CFilter-Loop: Reflected Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org Add missing mmput() on error path to avoid ref-count leak. This problem is introduced by 79bb5b7ee177 ("RDMA/umem: Fix missing mmap_sem in get umem ODP call") and resolved by f27a0d50a4bc ("RDMA/umem: Use umem->owning_mm inside ODP"). So, it's only needed in stable-4.14 and stable-4.19. Fixes: 79bb5b7ee177 ("RDMA/umem: Fix missing mmap_sem in get umem ODP call") Signed-off-by: Yang Yingliang --- drivers/infiniband/core/umem_odp.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/infiniband/core/umem_odp.c b/drivers/infiniband/core/umem_odp.c index eeafdc0beec7..08ef654ea9b8 100644 --- a/drivers/infiniband/core/umem_odp.c +++ b/drivers/infiniband/core/umem_odp.c @@ -347,7 +347,8 @@ int ib_umem_odp_get(struct ib_ucontext *context, struct ib_umem *umem, vma = find_vma(mm, ib_umem_start(umem)); if (!vma || !is_vm_hugetlb_page(vma)) { up_read(&mm->mmap_sem); - return -EINVAL; + ret_val = -EINVAL; + goto out_mm; } h = hstate_vma(vma); umem->page_shift = huge_page_shift(h);