From cda309de253f338b04d15b4478e45fc3a0fcc7a3 Mon Sep 17 00:00:00 2001
From: Miklos Szeredi <mszeredi@suse.cz>
Date: Mon, 26 Mar 2012 12:54:21 +0200
Subject: [PATCH] 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>
---
fs/namei.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)
diff --git a/fs/namei.c b/fs/namei.c
index 82f9568d315d1..907e247855762 100644
--- 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);
}
--
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