From ba4c67942c98716fcfd1fd576421a964077cefed Mon Sep 17 00:00:00 2001
From: er-azh <80633916+er-azh@users.noreply.github.com>
Date: Sat, 26 Mar 2022 17:27:36 +0430
Subject: [PATCH] Linux: allocate cpuData before reading cpu count.

---
 linux/LinuxProcessList.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/linux/LinuxProcessList.c b/linux/LinuxProcessList.c
index 3002e829..67493cd0 100644
--- a/linux/LinuxProcessList.c
+++ b/linux/LinuxProcessList.c
@@ -174,16 +174,19 @@ static void LinuxProcessList_updateCPUcount(ProcessList* super) {
    LinuxProcessList* this = (LinuxProcessList*) super;
    unsigned int existing = 0, active = 0;
 
-   DIR* dir = opendir("/sys/devices/system/cpu");
-   if (!dir) {
+   // Initialize the cpuData array before anything else.
+   if (!this->cpuData) {
       this->cpuData = xReallocArrayZero(this->cpuData, super->existingCPUs ? (super->existingCPUs + 1) : 0, 2, sizeof(CPUData));
       this->cpuData[0].online = true; /* average is always "online" */
       this->cpuData[1].online = true;
       super->activeCPUs = 1;
       super->existingCPUs = 1;
-      return;
    }
 
+   DIR* dir = opendir("/sys/devices/system/cpu");
+   if (!dir)
+      return;
+
    unsigned int currExisting = super->existingCPUs;
 
    const struct dirent* entry;
@@ -233,6 +236,10 @@ static void LinuxProcessList_updateCPUcount(ProcessList* super) {
 
    closedir(dir);
 
+   // return if no CPU is found
+   if (existing < 1)
+      return;
+
 #ifdef HAVE_SENSORS_SENSORS_H
    /* When started with offline CPUs, libsensors does not monitor those,
     * even when they become online. */