linux-kernel - Re: [RESEND PATCH 1/3] net: hns: fix uninitialized data use

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Message-Id: <20170325.200546.249222967254161798.davem@davemloft.net>
Date:   Sat, 25 Mar 2017 20:05:46 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     arnd@...db.de
Cc:     dledford@...hat.com, oulijun@...wei.com, xavier.huwei@...wei.com,
        huangdaode@...ilicon.com, yankejian@...wei.com,
        xieqianqian@...wei.com, weiyongjun1@...wei.com,
        yisen.zhuang@...wei.com, salil.mehta@...wei.com,
        sean.hefty@...el.com, hal.rosenstock@...il.com,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [RESEND PATCH 1/3] net: hns: fix uninitialized data use

From: Arnd Bergmann <arnd@...db.de>
Date: Fri, 24 Mar 2017 23:02:49 +0100

> When dev_dbg() is enabled, we print uninitialized data, as gcc-7.0.1
> now points out:
> 
> ethernet/hisilicon/hns/hns_dsaf_main.c: In function 'hns_dsaf_set_promisc_tcam':
> ethernet/hisilicon/hns/hns_dsaf_main.c:2947:75: error: 'tbl_tcam_data.low.val' may be used uninitialized in this function [-Werror=maybe-uninitialized]
> ethernet/hisilicon/hns/hns_dsaf_main.c:2947:75: error: 'tbl_tcam_data.high.val' may be used uninitialized in this function [-Werror=maybe-uninitialized]
> 
> We also pass the data into hns_dsaf_tcam_mc_cfg(), which might later
> use it (not sure about that), so it seems safer to just always initialize
> the tbl_tcam_data structure.
> 
> Fixes: 1f5fa2dd1cfa ("net: hns: fix for promisc mode in HNS driver")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Applied.