linux-kernel - [PATCH 5.15 635/917] pinctrl: renesas: checker: Fix off-by-one bug in drive register check

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Date:   Mon, 15 Nov 2021 18:02:10 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 635/917] pinctrl: renesas: checker: Fix off-by-one bug in drive register check

From: Geert Uytterhoeven <geert+renesas@...der.be>

[ Upstream commit 28e7f8ff90583791a034d43b5d2e3fe394142e13 ]

The GENMASK(h, l) macro creates a contiguous bitmask starting at bit
position @l and ending at position @h, inclusive.

This did not trigger any error checks, as the individual register fields
cover at most 3 of the 4 available bits.

Fixes: 08df16e07ad0a1ec ("pinctrl: sh-pfc: checker: Add drive strength register checks")
Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
Link: https://lore.kernel.org/r/8f82d6147fbe3367d4c83962480e97f58d9c96a2.1633615652.git.geert+renesas@glider.be
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/pinctrl/renesas/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pinctrl/renesas/core.c b/drivers/pinctrl/renesas/core.c
index f2ab02225837e..f29130957e49a 100644
--- a/drivers/pinctrl/renesas/core.c
+++ b/drivers/pinctrl/renesas/core.c
@@ -890,7 +890,7 @@ static void __init sh_pfc_check_drive_reg(const struct sh_pfc_soc_info *info,
 		if (!field->pin && !field->offset && !field->size)
 			continue;
 
-		mask = GENMASK(field->offset + field->size, field->offset);
+		mask = GENMASK(field->offset + field->size - 1, field->offset);
 		if (mask & seen)
 			sh_pfc_err("drive_reg 0x%x: field %u overlap\n",
 				   drive->reg, i);
-- 
2.33.0