From: Miklos Szeredi <miklos@szeredi.hu>
To: akpm@osdl.org
Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: [patch 03/12] fuse: locking fix for nlookup
Date: Mon, 16 Oct 2006 18:27:12 +0200 [thread overview]
Message-ID: <20061016162734.724613000@szeredi.hu> (raw)
In-Reply-To: <20061016162709.369579000@szeredi.hu>
[-- Attachment #1: fuse_protect_nlookup.patch --]
[-- Type: text/plain, Size: 1189 bytes --]
An inode could be returned by independent parallel lookups, in this
case an update of the lookup counter could be lost resulting in a
memory leak in userspace.
Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
---
Index: linux/fs/fuse/dir.c
===================================================================
--- linux.orig/fs/fuse/dir.c 2006-10-16 16:06:11.000000000 +0200
+++ linux/fs/fuse/dir.c 2006-10-16 16:08:00.000000000 +0200
@@ -163,7 +163,9 @@ static int fuse_dentry_revalidate(struct
fuse_send_forget(fc, req, outarg.nodeid, 1);
return 0;
}
+ spin_lock(&fc->lock);
fi->nlookup ++;
+ spin_unlock(&fc->lock);
}
fuse_put_request(fc, req);
if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT)
Index: linux/fs/fuse/inode.c
===================================================================
--- linux.orig/fs/fuse/inode.c 2006-10-16 15:57:12.000000000 +0200
+++ linux/fs/fuse/inode.c 2006-10-16 16:08:00.000000000 +0200
@@ -195,7 +195,9 @@ struct inode *fuse_iget(struct super_blo
}
fi = get_fuse_inode(inode);
+ spin_lock(&fc->lock);
fi->nlookup ++;
+ spin_unlock(&fc->lock);
fuse_change_attributes(inode, attr);
return inode;
}
--
next prev parent reply other threads:[~2006-10-16 16:28 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-16 16:27 [patch 00/12] fuse update Miklos Szeredi
2006-10-16 16:27 ` [patch 01/12] fuse: fix hang on SMP Miklos Szeredi
2006-10-16 23:51 ` Andrew Morton
2006-10-17 12:53 ` Mike Day
2006-10-17 13:43 ` Miklos Szeredi
2006-10-16 16:27 ` [patch 02/12] document i_size_write locking rules Miklos Szeredi
2006-10-16 16:27 ` Miklos Szeredi [this message]
2006-10-16 16:27 ` [patch 04/12] fuse: fix spurious BUG Miklos Szeredi
2006-10-16 16:27 ` [patch 05/12] fuse: fix handling of moved directory Miklos Szeredi
2006-10-16 16:27 ` [patch 06/12] fuse: fix dereferencing dentry parent Miklos Szeredi
2006-10-16 16:27 ` [patch 07/12] fuse: update userspace interface to version 7.8 Miklos Szeredi
2006-10-16 16:27 ` [patch 08/12] fuse: minor cleanup in fuse_dentry_revalidate Miklos Szeredi
2006-10-16 16:27 ` [patch 09/12] fuse: add support for block device based filesystems Miklos Szeredi
2006-10-16 16:27 ` [patch 10/12] fuse: add blksize option Miklos Szeredi
2006-10-16 16:27 ` [patch 11/12] fuse: add bmap support Miklos Szeredi
2006-10-16 16:27 ` [patch 12/12] fuse: add DESTROY operation Miklos Szeredi
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