netdev - Re: [PATCH 06/11] brcmfmac: sdio: Fix undefined behavior due to shift overflowing the constant

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Message-ID: <87y20jr1qt.fsf@kernel.org>
Date:   Tue, 05 Apr 2022 18:25:30 +0300
From:   Kalle Valo <kvalo@...nel.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Arend van Spriel <aspriel@...il.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        brcm80211-dev-list.pdl@...adcom.com, netdev@...r.kernel.org,
        linux-wireless@...r.kernel.org
Subject: Re: [PATCH 06/11] brcmfmac: sdio: Fix undefined behavior due to shift overflowing the constant

+ linux-wireless

Borislav Petkov <bp@...en8.de> writes:

> From: Borislav Petkov <bp@...e.de>
>
> Fix:
>
>   drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c: In function ‘brcmf_sdio_drivestrengthinit’:
>   drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c:3798:2: error: case label does not reduce to an integer constant
>     case SDIOD_DRVSTR_KEY(BRCM_CC_43143_CHIP_ID, 17):
>     ^~~~
>   drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c:3809:2: error: case label does not reduce to an integer constant
>     case SDIOD_DRVSTR_KEY(BRCM_CC_43362_CHIP_ID, 13):
>     ^~~~
>
> See https://lore.kernel.org/r/YkwQ6%2BtIH8GQpuct@zn.tnic for the gory
> details as to why it triggers with older gccs only.
>
> Signed-off-by: Borislav Petkov <bp@...e.de>
> Cc: Arend van Spriel <aspriel@...il.com>
> Cc: Franky Lin <franky.lin@...adcom.com>
> Cc: Hante Meuleman <hante.meuleman@...adcom.com>
> Cc: Kalle Valo <kvalo@...nel.org>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Jakub Kicinski <kuba@...nel.org>
> Cc: brcm80211-dev-list.pdl@...adcom.com
> Cc: netdev@...r.kernel.org
> ---
>  drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
> index ba3c159111d3..d78ccc223709 100644
> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
> @@ -557,7 +557,7 @@ enum brcmf_sdio_frmtype {
>  	BRCMF_SDIO_FT_SUB,
>  };
>  
> -#define SDIOD_DRVSTR_KEY(chip, pmu)     (((chip) << 16) | (pmu))
> +#define SDIOD_DRVSTR_KEY(chip, pmu)     (((unsigned int)(chip) << 16) | (pmu))

Via which tree is this going? I assume not the wireless tree, so:

Acked-by: Kalle Valo <kvalo@...nel.org>

-- 
https://patchwork.kernel.org/project/linux-wireless/list/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches