linux-kernel - [PATCH AUTOSEL 5.15 02/28] pinctrl: aspeed: Fix potential NULL dereference in aspeed_pinmux_set

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Message-Id: <20220714042429.281816-2-sashal@kernel.org>
Date:   Thu, 14 Jul 2022 00:24:03 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Haowen Bai <baihaowen@...zu.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Sasha Levin <sashal@...nel.org>, andrew@...id.au,
        joel@....id.au, linux-aspeed@...ts.ozlabs.org,
        openbmc@...ts.ozlabs.org, linux-gpio@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.15 02/28] pinctrl: aspeed: Fix potential NULL dereference in aspeed_pinmux_set_mux()

From: Haowen Bai <baihaowen@...zu.com>

[ Upstream commit 84a85d3fef2e75b1fe9fc2af6f5267122555a1ed ]

pdesc could be null but still dereference pdesc->name and it will lead to
a null pointer access. So we move a null check before dereference.

Signed-off-by: Haowen Bai <baihaowen@...zu.com>
Link: https://lore.kernel.org/r/1650508019-22554-1-git-send-email-baihaowen@meizu.com
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/pinctrl/aspeed/pinctrl-aspeed.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/pinctrl/aspeed/pinctrl-aspeed.c b/drivers/pinctrl/aspeed/pinctrl-aspeed.c
index c94e24aadf92..83d47ff1cea8 100644
--- a/drivers/pinctrl/aspeed/pinctrl-aspeed.c
+++ b/drivers/pinctrl/aspeed/pinctrl-aspeed.c
@@ -236,11 +236,11 @@ int aspeed_pinmux_set_mux(struct pinctrl_dev *pctldev, unsigned int function,
 		const struct aspeed_sig_expr **funcs;
 		const struct aspeed_sig_expr ***prios;
 
-		pr_debug("Muxing pin %s for %s\n", pdesc->name, pfunc->name);
-
 		if (!pdesc)
 			return -EINVAL;
 
+		pr_debug("Muxing pin %s for %s\n", pdesc->name, pfunc->name);
+
 		prios = pdesc->prios;
 
 		if (!prios)
-- 
2.35.1