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From: Krzysztof Kozlowski <krzk@kernel.org>
To: Krzysztof Kozlowski <krzk@kernel.org>,
	linux-arm-kernel@lists.infradead.org,
	linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Sylwester Nawrocki <snawrocki@kernel.org>,
	Marek Szyprowski <m.szyprowski@samsung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
	Arnd Bergmann <arnd@arndb.de>,
	Chanwoo Choi <cw00.choi@samsung.com>,
	Alim Akhtar <alim.akhtar@samsung.com>,
	Pankaj Dubey <pankaj.dubey@samsung.com>,
	stable@vger.kernel.org
Subject: [PATCH v2 2/4] soc: samsung: exynos-asv: handle reading revision register error
Date: Mon,  7 Dec 2020 20:05:15 +0100	[thread overview]
Message-ID: <20201207190517.262051-3-krzk@kernel.org> (raw)
In-Reply-To: <20201207190517.262051-1-krzk@kernel.org>

If regmap_read() fails, the product_id local variable will contain
random value from the stack.  Do not try to parse such value and fail
the ASV driver probe.

Fixes: 5ea428595cc5 ("soc: samsung: Add Exynos Adaptive Supply Voltage driver")
Cc: <stable@vger.kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
---
 drivers/soc/samsung/exynos-asv.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/samsung/exynos-asv.c b/drivers/soc/samsung/exynos-asv.c
index f653e3533f0f..5daeadc36382 100644
--- a/drivers/soc/samsung/exynos-asv.c
+++ b/drivers/soc/samsung/exynos-asv.c
@@ -129,7 +129,13 @@ static int exynos_asv_probe(struct platform_device *pdev)
 		return PTR_ERR(asv->chipid_regmap);
 	}
 
-	regmap_read(asv->chipid_regmap, EXYNOS_CHIPID_REG_PRO_ID, &product_id);
+	ret = regmap_read(asv->chipid_regmap, EXYNOS_CHIPID_REG_PRO_ID,
+			  &product_id);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Cannot read revision from ChipID: %d\n",
+			ret);
+		return -ENODEV;
+	}
 
 	switch (product_id & EXYNOS_MASK) {
 	case 0xE5422000:
-- 
2.25.1


WARNING: multiple messages have this Message-ID (diff)
From: Krzysztof Kozlowski <krzk@kernel.org>
To: Krzysztof Kozlowski <krzk@kernel.org>,
	linux-arm-kernel@lists.infradead.org,
	linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Arnd Bergmann <arnd@arndb.de>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
	Sylwester Nawrocki <snawrocki@kernel.org>,
	Pankaj Dubey <pankaj.dubey@samsung.com>,
	stable@vger.kernel.org, Chanwoo Choi <cw00.choi@samsung.com>,
	Alim Akhtar <alim.akhtar@samsung.com>,
	Marek Szyprowski <m.szyprowski@samsung.com>
Subject: [PATCH v2 2/4] soc: samsung: exynos-asv: handle reading revision register error
Date: Mon,  7 Dec 2020 20:05:15 +0100	[thread overview]
Message-ID: <20201207190517.262051-3-krzk@kernel.org> (raw)
In-Reply-To: <20201207190517.262051-1-krzk@kernel.org>

If regmap_read() fails, the product_id local variable will contain
random value from the stack.  Do not try to parse such value and fail
the ASV driver probe.

Fixes: 5ea428595cc5 ("soc: samsung: Add Exynos Adaptive Supply Voltage driver")
Cc: <stable@vger.kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
---
 drivers/soc/samsung/exynos-asv.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/samsung/exynos-asv.c b/drivers/soc/samsung/exynos-asv.c
index f653e3533f0f..5daeadc36382 100644
--- a/drivers/soc/samsung/exynos-asv.c
+++ b/drivers/soc/samsung/exynos-asv.c
@@ -129,7 +129,13 @@ static int exynos_asv_probe(struct platform_device *pdev)
 		return PTR_ERR(asv->chipid_regmap);
 	}
 
-	regmap_read(asv->chipid_regmap, EXYNOS_CHIPID_REG_PRO_ID, &product_id);
+	ret = regmap_read(asv->chipid_regmap, EXYNOS_CHIPID_REG_PRO_ID,
+			  &product_id);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Cannot read revision from ChipID: %d\n",
+			ret);
+		return -ENODEV;
+	}
 
 	switch (product_id & EXYNOS_MASK) {
 	case 0xE5422000:
-- 
2.25.1


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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply	other threads:[~2020-12-07 19:06 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-07 19:05 [PATCH v2 0/4] soc: samsung: exynos-chipid and asv improvements Krzysztof Kozlowski
2020-12-07 19:05 ` Krzysztof Kozlowski
2020-12-07 19:05 ` [PATCH v2 1/4] soc: samsung: exynos-asv: don't defer early on not-supported SoCs Krzysztof Kozlowski
2020-12-07 19:05   ` Krzysztof Kozlowski
2020-12-08  5:56   ` Pankaj Dubey
2020-12-08  5:56     ` Pankaj Dubey
2021-01-03 16:10   ` Krzysztof Kozlowski
2021-01-03 16:10     ` Krzysztof Kozlowski
2020-12-07 19:05 ` Krzysztof Kozlowski [this message]
2020-12-07 19:05   ` [PATCH v2 2/4] soc: samsung: exynos-asv: handle reading revision register error Krzysztof Kozlowski
2020-12-08  6:14   ` Pankaj Dubey
2020-12-08  6:14     ` Pankaj Dubey
2021-01-03 16:11   ` Krzysztof Kozlowski
2021-01-03 16:11     ` Krzysztof Kozlowski
2020-12-07 19:05 ` [PATCH v2 3/4] soc: samsung: exynos-chipid: order list of SoCs by name Krzysztof Kozlowski
2020-12-07 19:05   ` Krzysztof Kozlowski
2020-12-08  6:15   ` Pankaj Dubey
2020-12-08  6:15     ` Pankaj Dubey
2020-12-07 19:05 ` [PATCH v2 4/4] soc: samsung: exynos-chipid: convert to driver and merge exynos-asv Krzysztof Kozlowski
2020-12-07 19:05   ` Krzysztof Kozlowski
2020-12-08  7:01   ` Pankaj Dubey
2020-12-08  7:01     ` Pankaj Dubey
2020-12-08  8:47     ` 'Krzysztof Kozlowski'
2020-12-08  8:47       ` 'Krzysztof Kozlowski'
2021-01-03 16:10 ` (subset) [PATCH v2 0/4] soc: samsung: exynos-chipid and asv improvements Krzysztof Kozlowski
2021-01-03 16:10   ` Krzysztof Kozlowski

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