Re: [PATCH] brcmfmac: Fix off by one bug in brcmf_count_20mhz_channels()

From: Emil Goode
Date: Mon Sep 22 2014 - 18:38:54 EST


Hello Arend,

Ok I will resend with your ack.

Best regards,

Emil

On Mon, Sep 22, 2014 at 11:49:56AM +0200, Arend van Spriel wrote:
> 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.
> >
> >Introduced by:
> >commit b48d891676f756d48b4d0ee131e4a7a5d43ca417
> >("brcmfmac: rework wiphy structure setup")
>
> My bad :-(. You can add:
>
> Acked-by: Arend van Spriel <arend@xxxxxxxxxxxx>
> >Signed-off-by: Emil Goode<emilgoode@xxxxxxxxx>
> >---
> > 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);
> >
>
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