提交 626de996 编写于 作者: A Al Viro

namei: move link count check and stack allocation into pick_link()

Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
上级 d63ff28f
......@@ -891,16 +891,10 @@ const char *get_link(struct nameidata *nd)
if (nd->link.mnt == nd->path.mnt)
mntget(nd->link.mnt);
if (unlikely(current->total_link_count >= MAXSYMLINKS)) {
path_put(&nd->link);
return ERR_PTR(-ELOOP);
}
last->link = nd->link;
last->cookie = NULL;
cond_resched();
current->total_link_count++;
touch_atime(&last->link);
......@@ -1568,12 +1562,23 @@ static void terminate_walk(struct nameidata *nd)
static int pick_link(struct nameidata *nd, struct path *link)
{
int error;
if (unlikely(current->total_link_count++ >= MAXSYMLINKS)) {
path_to_nameidata(link, nd);
return -ELOOP;
}
if (nd->flags & LOOKUP_RCU) {
if (unlikely(nd->path.mnt != link->mnt ||
unlazy_walk(nd, link->dentry))) {
return -ECHILD;
}
}
error = nd_alloc_stack(nd);
if (unlikely(error)) {
path_to_nameidata(link, nd);
return error;
}
nd->link = *link;
return 1;
}
......@@ -1840,15 +1845,7 @@ static int link_path_walk(const char *name, struct nameidata *nd)
break;
if (err) {
const char *s;
err = nd_alloc_stack(nd);
if (unlikely(err)) {
path_to_nameidata(&nd->link, nd);
break;
}
s = get_link(nd);
const char *s = get_link(nd);
if (unlikely(IS_ERR(s))) {
err = PTR_ERR(s);
......
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