linux-kernel - [PATCH AUTOSEL 6.8 14/98] pinctrl: renesas: checker: Limit cfg reg enum checks to provided IDs

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Date: Fri, 29 Mar 2024 08:36:45 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Geert Uytterhoeven <geert+renesas@...der.be>,
	Sasha Levin <sashal@...nel.org>,
	linus.walleij@...aro.org,
	linux-renesas-soc@...r.kernel.org,
	linux-gpio@...r.kernel.org
Subject: [PATCH AUTOSEL 6.8 14/98] pinctrl: renesas: checker: Limit cfg reg enum checks to provided IDs

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

[ Upstream commit 3803584a4e9b65bb5b013f862f55c5055aa86c25 ]

If the number of provided enum IDs in a variable width config register
description does not match the expected number, the checker uses the
expected number for validating the individual enum IDs.

However, this may cause out-of-bounds accesses on the array holding the
enum IDs, leading to bogus enum_id conflict warnings.  Worse, if the bug
is an incorrect bit field description (e.g. accidentally using "12"
instead of "-12" for a reserved field), thousands of warnings may be
printed, overflowing the kernel log buffer.

Fix this by limiting the enum ID check to the number of provided enum
IDs.

Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
Link: https://lore.kernel.org/r/c7385f44f2faebb8856bcbb4e908d846fc1531fb.1705930809.git.geert+renesas@glider.be
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/pinctrl/renesas/core.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/pinctrl/renesas/core.c b/drivers/pinctrl/renesas/core.c
index 93e51abbf519a..8f6d7cc25b599 100644
--- a/drivers/pinctrl/renesas/core.c
+++ b/drivers/pinctrl/renesas/core.c
@@ -907,9 +907,11 @@ static void __init sh_pfc_check_cfg_reg(const char *drvname,
 		sh_pfc_err("reg 0x%x: var_field_width declares %u instead of %u bits\n",
 			   cfg_reg->reg, rw, cfg_reg->reg_width);
 
-	if (n != cfg_reg->nr_enum_ids)
+	if (n != cfg_reg->nr_enum_ids) {
 		sh_pfc_err("reg 0x%x: enum_ids[] has %u instead of %u values\n",
 			   cfg_reg->reg, cfg_reg->nr_enum_ids, n);
+		n = cfg_reg->nr_enum_ids;
+	}
 
 check_enum_ids:
 	sh_pfc_check_reg_enums(drvname, cfg_reg->reg, cfg_reg->enum_ids, n);
-- 
2.43.0