From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:34770 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730099AbeJBUQV (ORCPT ); Tue, 2 Oct 2018 16:16:21 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Leon Romanovsky , Jason Gunthorpe , Sasha Levin Subject: [PATCH 4.14 021/137] RDMA/i40w: Hold read semaphore while looking after VMA Date: Tue, 2 Oct 2018 06:23:42 -0700 Message-Id: <20181002132459.982773832@linuxfoundation.org> In-Reply-To: <20181002132458.446916963@linuxfoundation.org> References: <20181002132458.446916963@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Leon Romanovsky [ Upstream commit 5d9a2b0e28759e319a623da33940dbb3ce952b7d ] VMA lookup is supposed to be performed while mmap_sem is held. Fixes: f26c7c83395b ("i40iw: Add 2MB page support") Signed-off-by: Leon Romanovsky Signed-off-by: Jason Gunthorpe Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/infiniband/hw/i40iw/i40iw_verbs.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/infiniband/hw/i40iw/i40iw_verbs.c +++ b/drivers/infiniband/hw/i40iw/i40iw_verbs.c @@ -1408,6 +1408,7 @@ static void i40iw_set_hugetlb_values(u64 struct vm_area_struct *vma; struct hstate *h; + down_read(¤t->mm->mmap_sem); vma = find_vma(current->mm, addr); if (vma && is_vm_hugetlb_page(vma)) { h = hstate_vma(vma); @@ -1416,6 +1417,7 @@ static void i40iw_set_hugetlb_values(u64 iwmr->page_msk = huge_page_mask(h); } } + up_read(¤t->mm->mmap_sem); } /**