From: Felix Fietkau <nbd@nbd.name>
To: "Gustavo A. R. Silva" <gustavo@embeddedor.com>,
Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>,
Kalle Valo <kvalo@codeaurora.org>,
"David S. Miller" <davem@davemloft.net>,
Matthias Brugger <matthias.bgg@gmail.com>
Cc: linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [mt76/mt7603/mac] Question about missing variable assignment
Date: Sun, 3 Mar 2019 11:05:51 +0100 [thread overview]
Message-ID: <827d2ee6-04de-f4f9-15b4-40dac90bda9c@nbd.name> (raw)
In-Reply-To: <20190302211046.GA20268@embeddedor.com>
On 2019-03-02 22:10, Gustavo A. R. Silva wrote:
> Hi all,
>
> The following piece of code in drivers/net/wireless/mediatek/mt76/mt7603/mac.c
> is missing a variable assignment before line 1058. Notice that there
> is a potential execution path in which variable *i* is compared against
> magic number 15 at line 1075 without being initialized previously
> (this was reported by Coverity):
>
> 1055 out:
> 1056 final_rate_flags = info->status.rates[final_idx].flags;
> 1057
> 1058 switch (FIELD_GET(MT_TX_RATE_MODE, final_rate)) {
> 1059 case MT_PHY_TYPE_CCK:
> 1060 cck = true;
> 1061 /* fall through */
> 1062 case MT_PHY_TYPE_OFDM:
> 1063 if (dev->mt76.chandef.chan->band == NL80211_BAND_5GHZ)
> 1064 sband = &dev->mt76.sband_5g.sband;
> 1065 else
> 1066 sband = &dev->mt76.sband_2g.sband;
> 1067 final_rate &= GENMASK(5, 0);
> 1068 final_rate = mt7603_get_rate(dev, sband, final_rate, cck);
> 1069 final_rate_flags = 0;
> 1070 break;
> 1071 case MT_PHY_TYPE_HT_GF:
> 1072 case MT_PHY_TYPE_HT:
> 1073 final_rate_flags |= IEEE80211_TX_RC_MCS;
> 1074 final_rate &= GENMASK(5, 0);
> 1075 if (i > 15)
> 1076 return false;
> 1077 break;
> 1078 default:
> 1079 return false;
> 1080 }
>
> My guess is that such missing assignment should be something similar
> to the one at line 566:
>
> i = FIELD_GET(MT_RXV1_TX_RATE, rxdg0);
>
> but I'm not sure what the proper arguments for macro FIELD_GET should
> be.
>
> This code was introduced by commit c8846e1015022d2531ac4c895783e400b3e5babe
>
> What do you think?
Thanks for reporting this. The fix is simpler than that, the check
should be: if (final_rate > 15)
I will send a fix.
- Felix
next prev parent reply other threads:[~2019-03-03 10:06 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-02 21:10 [mt76/mt7603/mac] Question about missing variable assignment Gustavo A. R. Silva
2019-03-03 10:05 ` Felix Fietkau [this message]
2019-03-03 15:06 ` Gustavo A. R. Silva
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