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Date: Wed, 22 Feb 2017 02:06:29 +0200 From: Tuomas Tynkkynen <tuomas@...era.com> To: Alexander Viro <viro@...iv.linux.org.uk> CC: <linux-fsdevel@...r.kernel.org>, Eric Van Hensbergen <ericvh@...il.com>, <v9fs-developer@...ts.sourceforge.net>, <linux-kernel@...r.kernel.org>, "Aneesh Kumar K . V" <aneesh.kumar@...ux.vnet.ibm.com>, Tuomas Tynkkynen <tuomas@...era.com>, <stable@...r.kernel.org> Subject: [PATCH] fs/9p: Compare qid.path in v9fs_test_inode 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@...r.kernel.org Signed-off-by: Tuomas Tynkkynen <tuomas@...era.com> --- Does this sound sensible? I have never reproduced the problem myself but reportedly this patch solves some really weird problems where the symptoms match (wrong files being opened unpredictably). --- 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 30ca770c5e0b..f8ab4a66acaf 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 afaa4b6de801..c3dd0d42bb3a 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; } -- 2.11.1
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