pinctrl: single: fix pinctrl_spec.args_count bounds check

[ Upstream commit 9b9448f39e83d8e6fdfed006c5db8c304a98c2cd ]

The property #pinctrl-cells can either be 1 or 2:

- if #pinctrl-cells = <1>, then pinctrl_spec.args_count = 2
- if #pinctrl-cells = <2>, then pinctrl_spec.args_count = 3

All other values of pinctrl_spec.args_count are incorrect.  This fix
checks the upper bound instead of just the lower bound.

Fixes: a13395418888 ("pinctrl: single: parse #pinctrl-cells = 2")
Reported-by: Trent Piepho <tpiepho@gmail.com>
Signed-off-by: Drew Fustini <drew@beagleboard.org>
Acked-by: Tony Lindgren <tony@atomide.com>
Link: https://lore.kernel.org/linux-omap/3139716.CMS8C0sQ7x@zen.local/
Link: https://lore.kernel.org/r/20200930174839.1308344-1-drew@beagleboard.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c
index efe41abc5d4728fb435152310e1195e789e04687..5cbf0e55087c69a2c23594f1791c00fd98609051 100644 (file)
--- 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;