linux-kernel - [PATCH 09/17] do_last(): collapse the call of path_to

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200119031738.2681033-9-viro@ZenIV.linux.org.uk>
Date:   Sun, 19 Jan 2020 03:17:21 +0000
From:   Al Viro <viro@...IV.linux.org.uk>
To:     linux-fsdevel@...r.kernel.org
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, Aleksa Sarai <cyphar@...har.com>,
        David Howells <dhowells@...hat.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: [PATCH 09/17] do_last(): collapse the call of path_to_nameidata()

From: Al Viro <viro@...iv.linux.org.uk>

... and shift filling struct path to just before the call of
handle_mounts().  All callers of handle_mounts() are
immediately preceded by path->mnt = nd->path.mnt now.

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 fs/namei.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index 30503f114142..f66553ef436a 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3230,8 +3230,6 @@ static int do_last(struct nameidata *nd,
 		error = PTR_ERR(dentry);
 		goto out;
 	}
-	path.mnt = nd->path.mnt;
-	path.dentry = dentry;
 
 	if (file->f_mode & FMODE_OPENED) {
 		if ((file->f_mode & FMODE_CREATED) ||
@@ -3247,7 +3245,8 @@ static int do_last(struct nameidata *nd,
 		open_flag &= ~O_TRUNC;
 		will_truncate = false;
 		acc_mode = 0;
-		path_to_nameidata(&path, nd);
+		dput(nd->path.dentry);
+		nd->path.dentry = dentry;
 		goto finish_open_created;
 	}
 
@@ -3261,6 +3260,8 @@ static int do_last(struct nameidata *nd,
 		got_write = false;
 	}
 
+	path.mnt = nd->path.mnt;
+	path.dentry = dentry;
 	error = handle_mounts(&path, nd, &inode, &seq);
 	if (unlikely(error < 0))
 		return error;
-- 
2.20.1