netdev - Re: [PATCH net] net: diag: Don't double-free TCP_NEW_SYN_RECV sockets in tcp

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Date:   Sat, 7 Jul 2018 06:28:38 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Lorenzo Colitti <lorenzo@...gle.com>, netdev@...r.kernel.org
Cc:     astrachan@...gle.com, subashab@...eaurora.org,
        eric.dumazet@...il.com, davem@...emloft.net,
        David Ahern <dsa@...ulusnetworks.com>
Subject: Re: [PATCH net] net: diag: Don't double-free TCP_NEW_SYN_RECV sockets
 in tcp_abort



On 07/07/2018 12:31 AM, Lorenzo Colitti wrote:
> When tcp_diag_destroy closes a TCP_NEW_SYN_RECV socket, it first
> frees it by calling inet_csk_reqsk_queue_drop_and_and_put in
> tcp_abort, and then frees it again by calling sock_gen_put.
> 
> Since tcp_abort only has one caller, and all the other codepaths
> in tcp_abort don't free the socket, just remove the free in that
> function.
> 
> Cc: David Ahern <dsa@...ulusnetworks.com>
> Tested: passes Android sock_diag_test.py, which exercises this codepath
> Fixes: d7226c7a4dd1 ("net: diag: Fix refcnt leak in error path destroying socket")
> Signed-off-by: Lorenzo Colitti <lorenzo@...gle.com>
> ---

Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Thanks !