linux-kernel - [PATCH v2] pinctrl: single: check pinctrl_spec.args

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Date:   Mon, 14 Sep 2020 01:15:58 +0200
From:   Drew Fustini <drew@...gleboard.org>
To:     linux-arm-kernel@...ts.infradead.org,
        Tony Lindgren <tony@...mide.com>,
        Rob Herring <robh+dt@...nel.org>, linux-omap@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>,
        Haojian Zhuang <haojian.zhuang@...aro.org>,
        devicetree@...r.kernel.org, bcousson@...libre.com,
        Jason Kridner <jkridner@...gleboard.org>,
        Robert Nelson <robertcnelson@...il.com>,
        Trent Piepho <tpiepho@...il.com>
Cc:     Drew Fustini <drew@...gleboard.org>
Subject: [PATCH v2] pinctrl: single: check pinctrl_spec.args_count > 3

pinctrl_spec.args_count can either be 2 when #pinctrl-cells = 1 or
3 when #pinctrl-cells = 2.

There is currently only a check to make sure that it is 2 or greater.
This patch adds a check to make sure it is not greater than 3.

Fixes: a13395418888 ("pinctrl: single: parse #pinctrl-cells = 2")
Reported-by: Trent Piepho <tpiepho@...il.com>
Link: https://lore.kernel.org/linux-omap/3139716.CMS8C0sQ7x@zen.local/
Signed-off-by: Drew Fustini <drew@...gleboard.org>
---
v2 change:
- this is a fix to my prior email where I referred to #pinctrl-cells
  exceeding 3 which is incorrect.  It is pinctrl_spec.args_count which
  must be greater than 2 (when #pinctrl-cells = 1) and less than 3 (when
  #pinctrl-cells = 2)
https://lore.kernel.org/linux-omap/20200913210825.2022552-1-drew@beagleboard.org/


 drivers/pinctrl/pinctrl-single.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c
index efe41abc5d47..5cbf0e55087c 100644
--- a/drivers/pinctrl/pinctrl-single.c
+++ b/drivers/pinctrl/pinctrl-single.c
@@ -1014,7 +1014,7 @@ static int pcs_parse_one_pinctrl_entry(struct pcs_device *pcs,
 		if (res)
 			return res;
 
-		if (pinctrl_spec.args_count < 2) {
+		if (pinctrl_spec.args_count < 2 || pinctrl_spec.args_count > 3) {
 			dev_err(pcs->dev, "invalid args_count for spec: %i\n",
 				pinctrl_spec.args_count);
 			break;
-- 
2.25.1