linux-kernel - [PATCH] pinctrl: intel: fix NULL pointer deref

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Message-Id: <20210609062722.9132-1-henning.schild@siemens.com>
Date:   Wed,  9 Jun 2021 08:27:22 +0200
From:   Henning Schild <henning.schild@...mens.com>
To:     linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        Andy Shevchenko <andy@...nel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Henning Schild <henning.schild@...mens.com>
Subject: [PATCH] pinctrl: intel: fix NULL pointer deref

match could be NULL in which case we do not go ACPI after all

Signed-off-by: Henning Schild <henning.schild@...mens.com>
---
 drivers/pinctrl/intel/pinctrl-intel.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/pinctrl/intel/pinctrl-intel.c b/drivers/pinctrl/intel/pinctrl-intel.c
index 85750974d182..dca17bb76cac 100644
--- a/drivers/pinctrl/intel/pinctrl-intel.c
+++ b/drivers/pinctrl/intel/pinctrl-intel.c
@@ -1601,12 +1601,12 @@ const struct intel_pinctrl_soc_data *intel_pinctrl_get_soc_data(struct platform_
 	const struct intel_pinctrl_soc_data *data = NULL;
 	const struct intel_pinctrl_soc_data **table;
 	struct acpi_device *adev;
+	const void *match;
 	unsigned int i;
 
 	adev = ACPI_COMPANION(&pdev->dev);
-	if (adev) {
-		const void *match = device_get_match_data(&pdev->dev);
-
+	match = device_get_match_data(&pdev->dev);
+	if (adev && match) {
 		table = (const struct intel_pinctrl_soc_data **)match;
 		for (i = 0; table[i]; i++) {
 			if (!strcmp(adev->pnp.unique_id, table[i]->uid)) {
-- 
2.31.1