linux-kernel - [PATCH 13/15] afs: Don't invalidate callback if AFS_VNODE_DIR

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: <155793763180.31671.1818998763349462440.stgit@warthog.procyon.org.uk>
Date:   Wed, 15 May 2019 17:27:11 +0100
From:   David Howells <dhowells@...hat.com>
To:     linux-afs@...ts.infradead.org
Cc:     dhowells@...hat.com, linux-kernel@...r.kernel.org
Subject: [PATCH 13/15] afs: Don't invalidate callback if AFS_VNODE_DIR_VALID
 not set

Don't invalidate the callback promise on a directory if the
AFS_VNODE_DIR_VALID flag is not set (which indicates that the directory
contents are invalid, due to edit failure, callback break, page reclaim).

The directory will be reloaded next time the directory is accessed, so
clearing the callback flag at this point may race with a reload of the
directory and cancel it's recorded callback promise.

Fixes: f3ddee8dc4e2 ("afs: Fix directory handling")
Signed-off-by: David Howells <dhowells@...hat.com>
---

 fs/afs/inode.c |    7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/fs/afs/inode.c b/fs/afs/inode.c
index 1e630f016dc5..bf8f56e851df 100644
--- a/fs/afs/inode.c
+++ b/fs/afs/inode.c
@@ -430,12 +430,9 @@ int afs_validate(struct afs_vnode *vnode, struct key *key)
 			vnode->cb_s_break = vnode->cb_interest->server->cb_s_break;
 			vnode->cb_v_break = vnode->volume->cb_v_break;
 			valid = false;
-		} else if (vnode->status.type == AFS_FTYPE_DIR &&
-			   (!test_bit(AFS_VNODE_DIR_VALID, &vnode->flags) ||
-			    vnode->cb_expires_at - 10 <= now)) {
+		} else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) {
 			valid = false;
-		} else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags) ||
-			   vnode->cb_expires_at - 10 <= now) {
+		} else if (vnode->cb_expires_at - 10 <= now) {
 			valid = false;
 		} else {
 			valid = true;