From: "Toke Høiland-Jørgensen" <toke@redhat.com>
To: Dan Carpenter <dan.carpenter@oracle.com>, Felix Fietkau <nbd@nbd.name>
Cc: Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>,
Ryder Lee <ryder.lee@mediatek.com>, Roy Luo <royluo@google.com>,
Kalle Valo <kvalo@codeaurora.org>,
Matthias Brugger <matthias.bgg@gmail.com>,
linux-wireless@vger.kernel.org,
linux-mediatek@lists.infradead.org,
kernel-janitors@vger.kernel.org
Subject: Re: [PATCH] mt76: Off by one in mt76_calc_rx_airtime()
Date: Tue, 26 Nov 2019 09:04:15 +0100 [thread overview]
Message-ID: <87v9r7ysg0.fsf@toke.dk> (raw)
In-Reply-To: <20191121213935.2cbgh3qmd4hv4v5a@kili.mountain>
Dan Carpenter <dan.carpenter@oracle.com> writes:
> The sband->bitrates[] array has "sband->n_bitrates" elements so this
> check needs to be >= instead of > or we could read beyond the end of the
> array.
>
> These values come from when we call mt76_register_device():
>
> ret = mt76_register_device(&dev->mt76, true, mt7603_rates,
> ARRAY_SIZE(mt7603_rates));
>
> Here sband->bitrates[] is mt7603_rates[] and ->n_bitrates is the
> ARRAY_SIZE()
>
> Fixes: 5ce09c1a7907 ("mt76: track rx airtime for airtime fairness and survey")
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> ---
> drivers/net/wireless/mediatek/mt76/airtime.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/wireless/mediatek/mt76/airtime.c b/drivers/net/wireless/mediatek/mt76/airtime.c
> index 55116f395f9a..a4a785467748 100644
> --- a/drivers/net/wireless/mediatek/mt76/airtime.c
> +++ b/drivers/net/wireless/mediatek/mt76/airtime.c
> @@ -242,7 +242,7 @@ u32 mt76_calc_rx_airtime(struct mt76_dev *dev, struct mt76_rx_status *status,
> return 0;
>
> sband = dev->hw->wiphy->bands[status->band];
> - if (!sband || status->rate_idx > sband->n_bitrates)
> + if (!sband || status->rate_idx >= sband->n_bitrates)
> return 0;
>
> rate = &sband->bitrates[status->rate_idx];
This code has recently been ported to mac80211 (net/mac80211/airtime.c).
It seems that the bug is also present there; care to send a patch for
that as well? :)
-Toke
next prev parent reply other threads:[~2019-11-26 8:04 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-26 4:49 [PATCH] mt76: Off by one in mt76_calc_rx_airtime() Dan Carpenter
2019-11-26 5:21 ` Kalle Valo
2019-11-26 5:25 ` Markus Theil
2019-11-26 8:04 ` Toke Høiland-Jørgensen [this message]
2019-11-26 9:11 ` Dan Carpenter
2019-11-26 9:16 ` Toke Høiland-Jørgensen
2019-11-26 9:23 ` Kalle Valo
2019-11-26 12:09 ` [PATCH] mac80211: airtime: Fix an off by one in ieee80211_calc_rx_airtime() Dan Carpenter
2019-11-26 12:39 ` Toke Høiland-Jørgensen
2019-12-18 18:51 ` [PATCH] mt76: Off by one in mt76_calc_rx_airtime() Kalle Valo
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