Commit 8da5ff23 authored by Miklos Szeredi's avatar Miklos Szeredi Committed by Linus Torvalds
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[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: default avatarMiklos Szeredi <miklos@szeredi.hu>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 7762f5a0
......@@ -163,7 +163,9 @@ static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
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)
......
......@@ -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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