vfs: move MAY_EXEC check from __lookup_hash()

The only caller of __lookup_hash() that needs the exec permission check on
parent is lookup_one_len().

All lookup_hash() callers already checked permission in LOOKUP_PARENT walk.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/namei.c b/fs/namei.c
index 82f9568..907e247 100644 (file)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1849,13 +1849,7 @@ int vfs_path_lookup(struct dentry *dentry, struct vfsmount *mnt,
 static struct dentry *__lookup_hash(struct qstr *name,
                struct dentry *base, struct nameidata *nd)
 {
-       struct inode *inode = base->d_inode;
        struct dentry *dentry;
-       int err;
-
-       err = inode_permission(inode, MAY_EXEC);
-       if (err)
-               return ERR_PTR(err);
 
        /*
         * Don't bother with __d_lookup: callers are for creat as
@@ -1922,6 +1916,7 @@ struct dentry *lookup_one_len(const char *name, struct dentry *base, int len)
 {
        struct qstr this;
        unsigned int c;
+       int err;
 
        WARN_ON_ONCE(!mutex_is_locked(&base->d_inode->i_mutex));
 
@@ -1946,6 +1941,10 @@ struct dentry *lookup_one_len(const char *name, struct dentry *base, int len)
                        return ERR_PTR(err);
        }
 
+       err = inode_permission(base->d_inode, MAY_EXEC);
+       if (err)
+               return ERR_PTR(err);
+
        return __lookup_hash(&this, base, NULL);
 }