netdev - Re: [PATCH net] net: Fix one possible memleak in ip_setup

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Date:   Mon, 16 Apr 2018 12:58:14 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     gfree.wind@....163.com
Cc:     kuznet@....inr.ac.ru, netdev@...r.kernel.org
Subject: Re: [PATCH net] net: Fix one possible memleak in ip_setup_cork

From: gfree.wind@....163.com
Date: Mon, 16 Apr 2018 10:16:45 +0800

> From: Gao Feng <gfree.wind@....163.com>
> 
> It would allocate memory in this function when the cork->opt is NULL. But
> the memory isn't freed if failed in the latter rt check, and return error
> directly. It causes the memleak if its caller is ip_make_skb which also
> doesn't free the cork->opt when meet a error.
> 
> Now move the rt check ahead to avoid the memleak.
> 
> Signed-off-by: Gao Feng <gfree.wind@....163.com>

Looks good, applied and queued up for -stable.

I guess in the other code paths, ip_flush_pending_frames() or similar
would clean up the in-sock cork information.