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

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Message-Id: <20180708.105705.1482010806994204196.davem@davemloft.net>
Date:   Sun, 08 Jul 2018 10:57:05 +0900 (KST)
From:   David Miller <davem@...emloft.net>
To:     lorenzo@...gle.com
Cc:     netdev@...r.kernel.org, astrachan@...gle.com,
        subashab@...eaurora.org, eric.dumazet@...il.com,
        dsa@...ulusnetworks.com
Subject: Re: [PATCH net] net: diag: Don't double-free TCP_NEW_SYN_RECV
 sockets in tcp_abort

From: Lorenzo Colitti <lorenzo@...gle.com>
Date: Sat,  7 Jul 2018 16:31:40 +0900

> 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>

Applied and queued up for -stable, thanks!