linux-kernel - Re: [PATCH] net: sched: fix a use-after-free error on chain on the error exit path

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Message-Id: <20170518.113126.77172400948863631.davem@davemloft.net>
Date:   Thu, 18 May 2017 11:31:26 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     colin.king@...onical.com
Cc:     jhs@...atatu.com, xiyou.wangcong@...il.com, jiri@...nulli.us,
        netdev@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: sched: fix a use-after-free error on chain on the
 error exit path

From: Colin King <colin.king@...onical.com>
Date: Thu, 18 May 2017 15:07:02 +0100

> From: Colin Ian King <colin.king@...onical.com>
> 
> Set chain to null after the call to tcf_chain_destroy so that we don't
> call tcf_chain_put on the error exit path, thus avoiding a use-after-free
> error.
> 
> Detected by CoverityScan, CID#1436357 ("Use after free")
> 
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Colin, you really need to make some adjustments to how you are submitting
these kinds of patches.

First of all, you must indicate the target tree in your Subject line
as "[PATCH net-next] " in this case.

Also, you need to add an appropriate Fixes: tag right before your
signoff.

Thank you.