linux-kernel - [PATCH RESEND] pinctrl: single: fix potential NULL dereference in pcs_get

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Message-Id: <20240821062132.1407444-1-make24@iscas.ac.cn>
Date: Wed, 21 Aug 2024 14:21:32 +0800
From: Ma Ke <make24@...as.ac.cn>
To: tony@...mide.com,
	haojian.zhuang@...aro.org,
	linus.walleij@...aro.org,
	akpm@...ux-foundation.org
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-omap@...r.kernel.org,
	linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Ma Ke <make24@...as.ac.cn>,
	stable@...r.kernel.org
Subject: [PATCH RESEND] pinctrl: single: fix potential NULL dereference in pcs_get_function()

pinmux_generic_get_function() can return NULL and the pointer 'function'
was dereferenced without checking against NULL. Add checking of pointer
'function' in pcs_get_function().

Found by code review.

Cc: stable@...r.kernel.org
Fixes: 571aec4df5b7 ("pinctrl: single: Use generic pinmux helpers for managing functions")
Signed-off-by: Ma Ke <make24@...as.ac.cn>
---
 drivers/pinctrl/pinctrl-single.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c
index 4c6bfabb6bd7..4da3c3f422b6 100644
--- a/drivers/pinctrl/pinctrl-single.c
+++ b/drivers/pinctrl/pinctrl-single.c
@@ -345,6 +345,8 @@ static int pcs_get_function(struct pinctrl_dev *pctldev, unsigned pin,
 		return -ENOTSUPP;
 	fselector = setting->func;
 	function = pinmux_generic_get_function(pctldev, fselector);
+	if (!function)
+		return -EINVAL;
 	*func = function->data;
 	if (!(*func)) {
 		dev_err(pcs->dev, "%s could not find function%i\n",
-- 
2.25.1