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From: Maxim Korotkov <korotkov.maxim.s@gmail.com>
To: Tony Lindgren <tony@atomide.com>
Cc: Maxim Korotkov <korotkov.maxim.s@gmail.com>,
	Haojian Zhuang <haojian.zhuang@linaro.org>,
	Linus Walleij <linus.walleij@linaro.org>,
	linux-arm-kernel@lists.infradead.org, linux-omap@vger.kernel.org,
	linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org,
	lvc-project@linuxtesting.org
Subject: [PATCH] pinctrl: single: fix potential NULL dereference
Date: Fri, 18 Nov 2022 13:43:32 +0300	[thread overview]
Message-ID: <20221118104332.943-1-korotkov.maxim.s@gmail.com> (raw)

Added checking of pointer "function" in pcs_set_mux().
pinmux_generic_get_function() can return NULL and the pointer
"function" was dereferenced without checking against NULL.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: 571aec4df5b7 ("pinctrl: single: Use generic pinmux helpers for managing functions")
Signed-off-by: Maxim Korotkov <korotkov.maxim.s@gmail.com>
---
 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 67bec7ea0f8b..5655a2da5413 100644
--- a/drivers/pinctrl/pinctrl-single.c
+++ b/drivers/pinctrl/pinctrl-single.c
@@ -372,6 +372,8 @@ static int pcs_set_mux(struct pinctrl_dev *pctldev, unsigned fselector,
 	if (!pcs->fmask)
 		return 0;
 	function = pinmux_generic_get_function(pctldev, fselector);
+	if (!function)
+		return -EINVAL;
 	func = function->data;
 	if (!func)
 		return -EINVAL;
-- 
2.17.1


             reply	other threads:[~2022-11-18 10:44 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-11-18 10:43 Maxim Korotkov [this message]
2022-11-18 12:52 ` [PATCH] pinctrl: single: fix potential NULL dereference Tony Lindgren
2023-01-25  9:03   ` Maxim Korotkov
2023-01-27 12:44 ` Linus Walleij

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