From: Arend van Spriel <arend@broadcom.com>
To: Emil Goode <emilgoode@gmail.com>
Cc: Brett Rudley <brudley@broadcom.com>,
"Franky (Zhenhui) Lin" <frankyl@broadcom.com>,
Hante Meuleman <meuleman@broadcom.com>,
"John W. Linville" <linville@tuxdriver.com>,
Pieter-Paul Giesberts <pieterpg@broadcom.com>,
Daniel Kim <dekim@broadcom.com>, <linux-wireless@vger.kernel.org>,
<brcm80211-dev-list@broadcom.com>, <netdev@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <kernel-janitors@vger.kernel.org>
Subject: Re: [PATCH] brcmfmac: Fix off by one bug in brcmf_count_20mhz_channels()
Date: Mon, 22 Sep 2014 11:56:43 +0200 [thread overview]
Message-ID: <541FF25B.9000404@broadcom.com> (raw)
In-Reply-To: <1411253932-27973-1-git-send-email-emilgoode@gmail.com>
On 09/21/14 00:58, Emil Goode wrote:
> In the brcmf_count_20mhz_channels function we are looping through a list
> of channels received from firmware. Since the index of the first channel
> is 0 the condition leads to an off by one bug. This is causing us to hit
> the WARN_ON_ONCE(1) calls in the brcmu_d11n_decchspec function, which is
> how I discovered the bug.
The fix is fine. Would like to know what exactly is going wrong. Can you
provide a kernel log with brcmfmac debugging enabled, ie. insmod
brcmfmac.ko debug=0x1416
Regards,
Arend
> Introduced by:
> commit b48d891676f756d48b4d0ee131e4a7a5d43ca417
> ("brcmfmac: rework wiphy structure setup")
>
> Signed-off-by: Emil Goode<emilgoode@gmail.com>
> ---
> drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.c b/drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.c
> index 02fe706..93b5dd9 100644
> --- a/drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.c
> +++ b/drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.c
> @@ -4918,7 +4918,7 @@ static void brcmf_count_20mhz_channels(struct brcmf_cfg80211_info *cfg,
> struct brcmu_chan ch;
> int i;
>
> - for (i = 0; i<= total; i++) {
> + for (i = 0; i< total; i++) {
> ch.chspec = (u16)le32_to_cpu(chlist->element[i]);
> cfg->d11inf.decchspec(&ch);
>
next prev parent reply other threads:[~2014-09-22 9:56 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-20 22:58 [PATCH] brcmfmac: Fix off by one bug in brcmf_count_20mhz_channels() Emil Goode
2014-09-22 9:49 ` Arend van Spriel
2014-09-22 22:38 ` Emil Goode
2014-09-22 9:56 ` Arend van Spriel [this message]
2014-09-22 23:08 ` Emil Goode
2014-09-23 9:33 ` Arend van Spriel
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