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=-12.8 required=3.0 tests=BAYES_00,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 5AAD4C83036 for ; Tue, 27 Oct 2020 15:56:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 104E720829 for ; Tue, 27 Oct 2020 15:56:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603814208; bh=5kuC3kJSimG113f+PYMvFxVBPS4coVAVuPo3jkozgVA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=f0EnnwH8iCDiXkLrYLmeJnyoL2lXfoaA0PR3ezz5r0UgllgKfNM8vKmXFxSNTRJRz V7WjKwIbqQyFYuGUQxcPO7aMYlO/Dw9YHiaLOdxoSP0kuTMZhC2+SRgbXY1jdd0tP0 zz7kBe4KdqQU+6WuIl2CbFrUr029lU5kCQRU+gTs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1803027AbgJ0PwE (ORCPT ); Tue, 27 Oct 2020 11:52:04 -0400 Received: from mail.kernel.org ([198.145.29.99]:49476 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1799597AbgJ0PcW (ORCPT ); Tue, 27 Oct 2020 11:32:22 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (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 E60EA22202; Tue, 27 Oct 2020 15:32:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603812741; bh=5kuC3kJSimG113f+PYMvFxVBPS4coVAVuPo3jkozgVA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cSqTjc66x815bal8G+u+4C21w8mOww+AWqDEiccdIBHBusZJZCo/Re30gaZmbiiPz 8MTGifP0ua2B2UVYms04MzLOOkSTw8Q3PVt+PkdsRlGGzgzMYebToSbrwx+I8q4od1 1ubEIyt4srTmF/X6PjaWFVhc3TQ+mmEt/PjIF4XU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, John Hubbard , Ira Weiny , Dan Carpenter , Souptick Joarder , Sasha Levin Subject: [PATCH 5.9 307/757] misc: mic: scif: Fix error handling path Date: Tue, 27 Oct 2020 14:49:17 +0100 Message-Id: <20201027135504.954643283@linuxfoundation.org> X-Mailer: git-send-email 2.29.1 In-Reply-To: <20201027135450.497324313@linuxfoundation.org> References: <20201027135450.497324313@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Souptick Joarder [ Upstream commit a81072a9c0ae734b7889929b0bc070fe3f353f0e ] Inside __scif_pin_pages(), when map_flags != SCIF_MAP_KERNEL it will call pin_user_pages_fast() to map nr_pages. However, pin_user_pages_fast() might fail with a return value -ERRNO. The return value is stored in pinned_pages->nr_pages. which in turn is passed to unpin_user_pages(), which expects pinned_pages->nr_pages >=0, else disaster. Fix this by assigning pinned_pages->nr_pages to 0 if pin_user_pages_fast() returns -ERRNO. Fixes: ba612aa8b487 ("misc: mic: SCIF memory registration and unregistration") Cc: John Hubbard Cc: Ira Weiny Cc: Dan Carpenter Reviewed-by: John Hubbard Signed-off-by: Souptick Joarder Link: https://lore.kernel.org/r/1600570295-29546-1-git-send-email-jrdr.linux@gmail.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/misc/mic/scif/scif_rma.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/misc/mic/scif/scif_rma.c b/drivers/misc/mic/scif/scif_rma.c index 2da3b474f4863..18fb9d8b8a4b5 100644 --- a/drivers/misc/mic/scif/scif_rma.c +++ b/drivers/misc/mic/scif/scif_rma.c @@ -1392,6 +1392,8 @@ int __scif_pin_pages(void *addr, size_t len, int *out_prot, (prot & SCIF_PROT_WRITE) ? FOLL_WRITE : 0, pinned_pages->pages); if (nr_pages != pinned_pages->nr_pages) { + if (pinned_pages->nr_pages < 0) + pinned_pages->nr_pages = 0; if (try_upgrade) { if (ulimit) __scif_dec_pinned_vm_lock(mm, nr_pages); @@ -1408,7 +1410,6 @@ int __scif_pin_pages(void *addr, size_t len, int *out_prot, if (pinned_pages->nr_pages < nr_pages) { err = -EFAULT; - pinned_pages->nr_pages = nr_pages; goto dec_pinned; } @@ -1421,7 +1422,6 @@ int __scif_pin_pages(void *addr, size_t len, int *out_prot, __scif_dec_pinned_vm_lock(mm, nr_pages); /* Something went wrong! Rollback */ error_unmap: - pinned_pages->nr_pages = nr_pages; scif_destroy_pinned_pages(pinned_pages); *pages = NULL; dev_dbg(scif_info.mdev.this_device, -- 2.25.1