linux-kernel - Re: [PATCH] [net-next] net: sched: avoid uninitialized variable use

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Message-ID: <20180118134910.GA2063@nanopsycho.orion>
Date:   Thu, 18 Jan 2018 14:49:10 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        David Ahern <dsa@...ulusnetworks.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [net-next] net: sched: avoid uninitialized variable use

Thu, Jan 18, 2018 at 02:17:28PM CET, arnd@...db.de wrote:
>gcc has identified a code path in which we pass uninitialized
>data into tc_dump_tfilter():
>
>net/sched/cls_api.c: In function 'tc_dump_tfilter':
>net/sched/cls_api.c:1268:8: error: 'parent' may be used uninitialized in this function [-Werror=maybe-uninitialized]
>
>This initializes the variable to the value it had before the previous
>change.
>
>Fixes: 7960d1daf278 ("net: sched: use block index as a handle instead of qdisc when block is shared")
>Signed-off-by: Arnd Bergmann <arnd@...db.de>
>----
>I don't know if my patch is the best way to address the issue, but
>if not, then at least it helps show what the warning is about
>and lets someone else come up with a better solution.

I already sent a fix for this:
http://patchwork.ozlabs.org/patch/862787/