From 8da5ff23ce0a84d9845b01e6fe5047e17836bf5a Mon Sep 17 00:00:00 2001
From: Miklos Szeredi <miklos@szeredi.hu>
Date: Tue, 17 Oct 2006 00:10:08 -0700
Subject: [PATCH] fuse: locking fix for nlookup

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>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
 fs/fuse/inode.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'fs/fuse/inode.c')

diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 8e106163aaed..e9114237f31f 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -195,7 +195,9 @@ struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid,
 	}
 
 	fi = get_fuse_inode(inode);
+	spin_lock(&fc->lock);
 	fi->nlookup ++;
+	spin_unlock(&fc->lock);
 	fuse_change_attributes(inode, attr);
 	return inode;
 }
-- 
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