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diff --git a/Source/WebCore/page/linux/ResourceUsageThreadLinux.cpp b/Source/WebCore/page/linux/ResourceUsageThreadLinux.cpp
index d9e4179072d..b1f51e14f6f 100644
--- a/Source/WebCore/page/linux/ResourceUsageThreadLinux.cpp
+++ b/Source/WebCore/page/linux/ResourceUsageThreadLinux.cpp
@@ -58,8 +58,14 @@ static float cpuPeriod()
unsigned long long userTime, niceTime, systemTime, idleTime;
unsigned long long ioWait, irq, softIrq, steal, guest, guestnice;
ioWait = irq = softIrq = steal = guest = guestnice = 0;
- sscanf(buffer, "cpu %16llu %16llu %16llu %16llu %16llu %16llu %16llu %16llu %16llu %16llu",
+ int retVal = sscanf(buffer, "cpu %16llu %16llu %16llu %16llu %16llu %16llu %16llu %16llu %16llu %16llu",
&userTime, &niceTime, &systemTime, &idleTime, &ioWait, &irq, &softIrq, &steal, &guest, &guestnice);
+ // We expect 10 values to be matched by sscanf
+ if (retVal < 10 || retVal == EOF) {
+ fclose(file);
+ return 0;
+ }
+
// Keep parsing if we still don't know cpuCount.
static unsigned cpuCount = 0;