1 files changed, 6 insertions, 0 deletions
diff --git a/verifier.cpp b/verifier.cpp
index e9d540cdb..8be6da09f 100644
--- a/verifier.cpp
+++ b/verifier.cpp
@@ -153,6 +153,12 @@ int verify_file(const unsigned char* addr, size_t length, const std::vector<Cert
   LOG(INFO) << "comment is " << comment_size << " bytes; signature is " << signature_start
             << " bytes from end";
 
+  if (signature_start > comment_size) {
+    LOG(ERROR) << "signature start: " << signature_start << " is larger than comment size: "
+               << comment_size;
+    return VERIFY_FAILURE;
+  }
+
   if (signature_start <= FOOTER_SIZE) {
     LOG(ERROR) << "Signature start is in the footer";
     return VERIFY_FAILURE;