diff --git a/src/system_wrappers/source/cpu_linux.cc b/src/system_wrappers/source/cpu_linux.cc
index 1abaf124d0..9d7d89de64 100644
--- a/src/system_wrappers/source/cpu_linux.cc
+++ b/src/system_wrappers/source/cpu_linux.cc
@@ -65,7 +65,8 @@ WebRtc_Word32 CpuLinux::CpuUsageMultiCore(WebRtc_UWord32& numCores,
     numCores = m_numCores;
     long long busy = 0;
     long long idle = 0;
-    GetData(busy, idle, m_busyArray, m_idleArray);
+    if (GetData(busy, idle, m_busyArray, m_idleArray) != 0)
+        return -1;
 
     long long deltaBusy = busy - m_oldBusyTime;
     long long deltaIdle = idle - m_oldIdleTime;
@@ -116,18 +117,28 @@ int CpuLinux::GetData(long long& busy, long long& idle, long long*& busyArray,
     }
 
     char line[100];
-    char* dummy = fgets(line, 100, fp);
+    if (fgets(line, 100, fp) == NULL) {
+        fclose(fp);
+        return -1;
+    }
     char firstWord[100];
-    sscanf(line, "%s ", firstWord);
-    if(strncmp(firstWord, "cpu", 3)!=0)
-    {
+    if (sscanf(line, "%s ", firstWord) != 1) {
+        fclose(fp);
+        return -1;
+    }
+    if (strncmp(firstWord, "cpu", 3) != 0) {
+        fclose(fp);
         return -1;
     }
     char sUser[100];
     char sNice[100];
     char sSystem[100];
     char sIdle[100];
-    sscanf(line, "%s %s %s %s %s ", firstWord, sUser, sNice, sSystem, sIdle);
+    if (sscanf(line, "%s %s %s %s %s ",
+               firstWord, sUser, sNice, sSystem, sIdle) != 5) {
+        fclose(fp);
+        return -1;
+    }
     long long luser = atoll(sUser);
     long long lnice = atoll(sNice);
     long long lsystem = atoll(sSystem);
@@ -137,9 +148,15 @@ int CpuLinux::GetData(long long& busy, long long& idle, long long*& busyArray,
     idle = lidle;
     for (WebRtc_UWord32 i = 0; i < m_numCores; i++)
     {
-        dummy = fgets(line, 100, fp);
-        sscanf(line, "%s %s %s %s %s ", firstWord, sUser, sNice, sSystem,
-               sIdle);
+        if (fgets(line, 100, fp) == NULL) {
+            fclose(fp);
+            return -1;
+        }
+        if (sscanf(line, "%s %s %s %s %s ", firstWord, sUser, sNice, sSystem,
+                   sIdle) != 5) {
+            fclose(fp);
+            return -1;
+        }
         luser = atoll(sUser);
         lnice = atoll(sNice);
         lsystem = atoll(sSystem);
@@ -171,7 +188,9 @@ int CpuLinux::GetNumCores()
         numCores++;
         if (fgets(line, 100, fp))
         {
-            sscanf(line, "%s ", firstWord);
+            if (sscanf(line, "%s ", firstWord) != 1) {
+                firstWord[0] = '\0';
+            }
         } else {
             break;
         }