Re: [PATCH net] net/9p: Fix a potential socket leak in p9_socket_open

[wanghai (M)]

在 2022/11/24 17:15, asmadeus@xxxxxxxxxxxxx 写道:
> 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)
Hi, Dominique.
Thanks for reviewing.

Here is a typo, it should be csocket.
> > 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...
Yes, this mechanism was introduced by commit 8e1611e23579 ("make 
sock_alloc_file() do sock_release() on failures")
> > 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)
Yes, there was already a leak before this patch, and this patch also 
introduces a leak

--
Wang Hai