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-rw-r--r--src/ec/google/chromeec/ec.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/src/ec/google/chromeec/ec.c b/src/ec/google/chromeec/ec.c
index a97dfb355e..954e6490f7 100644
--- a/src/ec/google/chromeec/ec.c
+++ b/src/ec/google/chromeec/ec.c
@@ -393,7 +393,14 @@ void google_chromeec_log_events(uint64_t mask)
return;
events = google_chromeec_get_events_b() & mask;
- for (i = 0; i < sizeof(events) * 8; i++) {
+
+ /*
+ * This loop starts at 1 because the EC_HOST_EVENT_MASK macro subtracts
+ * 1 from its argument before applying the left-shift operator. This
+ * prevents a left-shift of -1 happening, and covers the entire 64-bit
+ * range of the event mask.
+ */
+ for (i = 1; i <= sizeof(events) * 8; i++) {
if (EC_HOST_EVENT_MASK(i) & events)
elog_add_event_byte(ELOG_TYPE_EC_EVENT, i);
}