linux-kernel - Re: [PATCH net] net/9p: Fix a potential socket leak in p9_socket

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Date:   Thu, 24 Nov 2022 18:15:54 +0900
From:   asmadeus@...ewreck.org
To:     Wang Hai <wanghai38@...wei.com>
Cc:     ericvh@...il.com, lucho@...kov.net, linux_oss@...debyte.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, viro@...iv.linux.org.uk,
        v9fs-developer@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH net] net/9p: Fix a potential socket leak in p9_socket_open

Wang Hai wrote on Thu, Nov 24, 2022 at 04:10:05PM +0800:
> Both p9_fd_create_tcp() and p9_fd_create_unix() will call
> p9_socket_open(). If the creation of p9_trans_fd fails,
> p9_fd_create_tcp() and p9_fd_create_unix() will return an
> error directly instead of releasing the cscoket, which will

(typo, socket or csocket -- I'll fix this on applying)

> result in a socket leak.
> 
> This patch adds sock_release() to fix the leak issue.

Thanks, it looks good to me.
A bit confusing that sock_alloc_files() calls sock_release() itself on
failure, but that means this one's safe at least...

> Fixes: 6b18662e239a ("9p connect fixes")

(the leak was present before that commit so I guess that's not really
correct -- but it might help figure out up to which point stable folks
will be able to backport so I guess it's useful either way)

-- 
Dominique