Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932865AbdIFPKj (ORCPT ); Wed, 6 Sep 2017 11:10:39 -0400 Received: from mx1.mpynet.fi ([82.197.21.84]:25008 "EHLO mx1.mpynet.fi" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932714AbdIFPKe (ORCPT ); Wed, 6 Sep 2017 11:10:34 -0400 From: Tuomas Tynkkynen To: Al Viro CC: , Eric Van Hensbergen , Ron Minnich , Latchesar Ionkov , "David S. Miller" , , , , Tuomas Tynkkynen , Subject: [PATCH 1/2] fs/9p: Compare qid.path in v9fs_test_inode Date: Wed, 6 Sep 2017 17:59:07 +0300 Message-ID: <20170906145908.8082-2-tuomas@tuxera.com> X-Mailer: git-send-email 2.13.0 In-Reply-To: <20170906145908.8082-1-tuomas@tuxera.com> References: <20170906145908.8082-1-tuomas@tuxera.com> MIME-Version: 1.0 Content-Type: text/plain X-ClientProxiedBy: tuxera-exch.ad.tuxera.com (10.20.48.11) To tuxera-exch.ad.tuxera.com (10.20.48.11) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1476 Lines: 46 Commit fd2421f54423 ("fs/9p: When doing inode lookup compare qid details and inode mode bits.") transformed v9fs_qid_iget() to use iget5_locked() instead of iget_locked(). However, the test() callback is not checking fid.path at all, which means that a lookup in the inode cache can now accidentally locate a completely wrong inode from the same inode hash bucket if the other fields (qid.type and qid.version) match. Fixes: fd2421f54423 ("fs/9p: When doing inode lookup compare qid details and inode mode bits.") Cc: stable@vger.kernel.org Reviewed-by: Latchesar Ionkov Signed-off-by: Tuomas Tynkkynen --- fs/9p/vfs_inode.c | 3 +++ fs/9p/vfs_inode_dotl.c | 3 +++ 2 files changed, 6 insertions(+) diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c index 2a5de610dd8f..bdabb2765d1b 100644 --- a/fs/9p/vfs_inode.c +++ b/fs/9p/vfs_inode.c @@ -483,6 +483,9 @@ static int v9fs_test_inode(struct inode *inode, void *data) if (v9inode->qid.type != st->qid.type) return 0; + + if (v9inode->qid.path != st->qid.path) + return 0; return 1; } diff --git a/fs/9p/vfs_inode_dotl.c b/fs/9p/vfs_inode_dotl.c index 70f9887c59a9..7f6ae21a27b3 100644 --- a/fs/9p/vfs_inode_dotl.c +++ b/fs/9p/vfs_inode_dotl.c @@ -87,6 +87,9 @@ static int v9fs_test_inode_dotl(struct inode *inode, void *data) if (v9inode->qid.type != st->qid.type) return 0; + + if (v9inode->qid.path != st->qid.path) + return 0; return 1; } -- 2.13.0