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authorWen Yang <wen.yang99@zte.com.cn>2019-07-17 11:55:04 +0800
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-07-23 09:49:10 +0200
commite0a12445d1cb186d875410d093a00d215bec6a89 (patch)
treef7c1d0a994545415e0891685123161feb2754df5 /drivers/cpufreq
parent5f9e832c137075045d15cd6899ab0505cfb2ca4b (diff)
downloadlinux-e0a12445d1cb186d875410d093a00d215bec6a89.tar.bz2
cpufreq/pasemi: fix use-after-free in pas_cpufreq_cpu_init()
The cpu variable is still being used in the of_get_property() call after the of_node_put() call, which may result in use-after-free. Fixes: a9acc26b75f6 ("cpufreq/pasemi: fix possible object reference leak") Signed-off-by: Wen Yang <wen.yang99@zte.com.cn> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpufreq')
-rw-r--r--drivers/cpufreq/pasemi-cpufreq.c23
1 files changed, 9 insertions, 14 deletions
diff --git a/drivers/cpufreq/pasemi-cpufreq.c b/drivers/cpufreq/pasemi-cpufreq.c
index 93f39a1d4c3d..c66f566a854c 100644
--- a/drivers/cpufreq/pasemi-cpufreq.c
+++ b/drivers/cpufreq/pasemi-cpufreq.c
@@ -131,10 +131,18 @@ static int pas_cpufreq_cpu_init(struct cpufreq_policy *policy)
int err = -ENODEV;
cpu = of_get_cpu_node(policy->cpu, NULL);
+ if (!cpu)
+ goto out;
+ max_freqp = of_get_property(cpu, "clock-frequency", NULL);
of_node_put(cpu);
- if (!cpu)
+ if (!max_freqp) {
+ err = -EINVAL;
goto out;
+ }
+
+ /* we need the freq in kHz */
+ max_freq = *max_freqp / 1000;
dn = of_find_compatible_node(NULL, NULL, "1682m-sdc");
if (!dn)
@@ -171,16 +179,6 @@ static int pas_cpufreq_cpu_init(struct cpufreq_policy *policy)
}
pr_debug("init cpufreq on CPU %d\n", policy->cpu);
-
- max_freqp = of_get_property(cpu, "clock-frequency", NULL);
- if (!max_freqp) {
- err = -EINVAL;
- goto out_unmap_sdcpwr;
- }
-
- /* we need the freq in kHz */
- max_freq = *max_freqp / 1000;
-
pr_debug("max clock-frequency is at %u kHz\n", max_freq);
pr_debug("initializing frequency table\n");
@@ -199,9 +197,6 @@ static int pas_cpufreq_cpu_init(struct cpufreq_policy *policy)
cpufreq_generic_init(policy, pas_freqs, get_gizmo_latency());
return 0;
-out_unmap_sdcpwr:
- iounmap(sdcpwr_mapbase);
-
out_unmap_sdcasr:
iounmap(sdcasr_mapbase);
out: