check index at increments crawlerstats_t->histo

Very rarely, current_time will be greater than expiration time of item.
If an item has expired at after check its expiration in crawler thread,
access to crawlerstats_t->histo with invalid index. so segmentation
fault occurs as a result of access violation.

1 files changed, 3 insertions, 1 deletions

diff --git a/crawler.c b/crawler.c
index 43245ea..93f7e1a 100644
--- a/crawler.c
+++ b/crawler.c
@@ -207,7 +207,9 @@ static void crawler_expired_eval(crawler_module_t *cm, item *search, uint32_t hv
         } else {
             rel_time_t ttl_remain = search->exptime - current_time;
             int bucket = ttl_remain / 60;
-            s->histo[bucket]++;
+            if (bucket <= 60) {
+                s->histo[bucket]++;
+            }
         }
     }
     pthread_mutex_unlock(&d->lock);