SimpleCache: Tolerate weird file sizes when doing index recovery.

net/disk_cache/simple/simple_synchronous_entry.cc

Index: net/disk_cache/simple/simple_synchronous_entry.cc
diff --git a/net/disk_cache/simple/simple_synchronous_entry.cc b/net/disk_cache/simple/simple_synchronous_entry.cc
index 2b4673c2384d29ff8082a912c0c441404daca107..dc27812c71382e95de0430d79a699a080174899d 100644
--- a/net/disk_cache/simple/simple_synchronous_entry.cc
+++ b/net/disk_cache/simple/simple_synchronous_entry.cc
@@ -43,7 +43,8 @@ enum OpenEntryResult {
   OPEN_ENTRY_KEY_MISMATCH = 6,
   OPEN_ENTRY_KEY_HASH_MISMATCH = 7,
   OPEN_ENTRY_SPARSE_OPEN_FAILED = 8,
-  OPEN_ENTRY_MAX = 9,
+  OPEN_ENTRY_INVALID_FILE_LENGTH = 9,
+  OPEN_ENTRY_MAX = 10,
 };
 
 // Used in histograms, please only add entries at the end.
@@ -951,6 +952,11 @@ bool SimpleSynchronousEntry::OpenFiles(SimpleEntryStat* out_entry_stat) {
     // 0, stream 1 and one EOF record. The exact distribution of sizes between
     // stream 1 and stream 0 is only determined after reading the EOF record
     // for stream 0 in ReadAndValidateStream0.
+    if (!base::IsValueInRangeForNumericType<int>(file_info.size)) {
+      RecordSyncOpenResult(cache_type_, OPEN_ENTRY_INVALID_FILE_LENGTH,
+                           had_index_);
+      return false;
+    }
     out_entry_stat->set_data_size(i + 1, static_cast<int>(file_info.size));
   }
   SIMPLE_CACHE_UMA(CUSTOM_COUNTS,