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Message-ID: <c8d8ac40-d4d5-417b-a67a-8b1fb016d2ca@broadcom.com>
Date: Tue, 7 May 2024 21:09:44 +0200
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Subject: Re: Buffer overrun error found in brcm80211 driver code
To: samasth.norway.ananda@oracle.com, Kalle Valo <kvalo@kernel.org>
Cc: linux-wireless@vger.kernel.org, "John W. Linville"
 <linville@tuxdriver.com>
References: <8292faa6-a2f6-4b43-8d60-9eeba85aa6b1@oracle.com>
From: Arend van Spriel <arend.vanspriel@broadcom.com>
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In-Reply-To: <8292faa6-a2f6-4b43-8d60-9eeba85aa6b1@oracle.com>
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- moved John to Cc: as he passed the wireless maintainer role to Kalle 
long ago.

On 5/6/2024 9:03 PM, samasth.norway.ananda@oracle.com wrote:
> Hi,
> 
> 
> I came across an issue reported by an internal static analysis tool when 
> tested on the code for brcm80211 driver.
> 
> The commit which introduced is -
> 5b435de0d786869c95d1962121af0d7df2542009
> ("net: wireless: add brcm80211 drivers")
> 
> 
> In the file -
> drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_lcn.c
> 
> within the function wlc_lcnphy_tx_iqlo_cal()
> 
> we assign value to band_idx as below
> band_idx = (CHSPEC_IS5G(pi->radio_chanspec) ? 1 : 0);
>  From this band_idx could be either 1 or 0.
> 
> But when we look at the array iqcal_gainparams_numgains_lcnphy[] at
> drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_lcn.c
> 
> We can notice that it is initialized with only one value in it.
> 
> static const u16 iqcal_gainparams_numgains_lcnphy[1] = {
>      ARRAY_SIZE(tbl_iqcal_gainparams_lcnphy_2G),
> };
> 
> 
> So, when we try to access iqcal_gainparams_numgains_lcnphy[band_idx]
> within the for loop in the same function we could be reading a wrong 
> value of  iqcal_gainparams_numgains_lcnphy[1]
> 
> Do you have any suggestion on how we can resolve this?
> Is it possible to keep band_idx to just 0?

Hi Samasth,

Did some digging through the code and the only device for which the LCN 
phy code is used is the BCM4313 which is a 2G-only device. Hence the 
band_idx in the code you pointed out will never be 1. My suggestion 
would be to get rid on band_idx and always use 0 instead and add:

if (WARN_ON(CHSPEC_IS5G(pi->radio_chanspec)))
	return;

before the kmalloc_array() call at the beginning of the function.

Regards,
Arend

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