From: Ilia Lin <ilia.lin@gmail.com>
Date: Sun, 17 Jun 2018 19:58:42 +0000 (+0200)
Subject: cpufreq: kryo: Fix possible error code dereference
X-Git-Tag: v4.18-rc2~26^2~5
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=ee3dbcf963c17775417d2fdf74e60f0c1b563dda;p=users%2Fhch%2Fblock.git

cpufreq: kryo: Fix possible error code dereference

In event of error returned by the nvmem_cell_read() non-pointer value
may be dereferenced. Fix this with error handling.
Additionally free the allocated speedbin buffer, as per the API.

Fixes: 9ce36edd1a52 (cpufreq: Add Kryo CPU scaling driver)
Signed-off-by: Ilia Lin <ilia.lin@gmail.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---

diff --git a/drivers/cpufreq/qcom-cpufreq-kryo.c b/drivers/cpufreq/qcom-cpufreq-kryo.c
index d049fe4b80c4..74b9b93d511b 100644
--- a/drivers/cpufreq/qcom-cpufreq-kryo.c
+++ b/drivers/cpufreq/qcom-cpufreq-kryo.c
@@ -115,6 +115,8 @@ static int qcom_cpufreq_kryo_probe(struct platform_device *pdev)
 
 	speedbin = nvmem_cell_read(speedbin_nvmem, &len);
 	nvmem_cell_put(speedbin_nvmem);
+	if (IS_ERR(speedbin))
+		return PTR_ERR(speedbin);
 
 	switch (msm8996_version) {
 	case MSM8996_V3:
@@ -127,6 +129,7 @@ static int qcom_cpufreq_kryo_probe(struct platform_device *pdev)
 		BUG();
 		break;
 	}
+	kfree(speedbin);
 
 	for_each_possible_cpu(cpu) {
 		cpu_dev = get_cpu_device(cpu);