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From:   Borislav Petkov <bp@alien8.de>
To:     LKML <linux-kernel@vger.kernel.org>
Cc:     Arend van Spriel <aspriel@gmail.com>,
        Franky Lin <franky.lin@broadcom.com>,
        Hante Meuleman <hante.meuleman@broadcom.com>,
        Kalle Valo <kvalo@kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        brcm80211-dev-list.pdl@broadcom.com, netdev@vger.kernel.org
Subject: [PATCH 06/11] brcmfmac: sdio: Fix undefined behavior due to shift overflowing the constant
Date:   Tue,  5 Apr 2022 17:15:12 +0200
Message-Id: <20220405151517.29753-7-bp@alien8.de>
In-Reply-To: <20220405151517.29753-1-bp@alien8.de>
References: <20220405151517.29753-1-bp@alien8.de>
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From: Borislav Petkov <bp@suse.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@suse.de>
Cc: Arend van Spriel <aspriel@gmail.com>
Cc: Franky Lin <franky.lin@broadcom.com>
Cc: Hante Meuleman <hante.meuleman@broadcom.com>
Cc: Kalle Valo <kvalo@kernel.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: brcm80211-dev-list.pdl@broadcom.com
Cc: netdev@vger.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))
 
 /* SDIO Pad drive strength to select value mappings */
 struct sdiod_drive_str {
-- 
2.35.1