Commit 1a8edf40 authored by Al Viro's avatar Al Viro

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: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent d73b3884
......@@ -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 @@ static int do_lookup(struct nameidata *nd, struct qstr *name,
goto need_lookup;
if (IS_ERR(dentry))
goto fail;
if (nd->flags & LOOKUP_RCU)
goto done2;
goto done;
fail:
......
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