From 1a8edf40e7c3eee955e0dd0316a7c9d85e36f597 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Sat, 15 Jan 2011 13:12:53 -0500 Subject: [PATCH] do_lookup() fix do_lookup() has a path leading from LOOKUP_RCU case to non-RCU crossing of mountpoints, which breaks things badly. If we hit need_revalidate: and do nothing in there, we need to come back into LOOKUP_RCU half of things, not to done: in non-RCU one. Signed-off-by: Al Viro --- fs/namei.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/namei.c b/fs/namei.c index 8df7a78ace58..529e917ad2fc 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -1089,6 +1089,7 @@ static int do_lookup(struct nameidata *nd, struct qstr *name, nd->seq = seq; if (dentry->d_flags & DCACHE_OP_REVALIDATE) goto need_revalidate; +done2: path->mnt = mnt; path->dentry = dentry; __follow_mount_rcu(nd, path, inode); @@ -1143,6 +1144,8 @@ need_revalidate: goto need_lookup; if (IS_ERR(dentry)) goto fail; + if (nd->flags & LOOKUP_RCU) + goto done2; goto done; fail: -- 2.20.1