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-rw-r--r--src/libutil/hash.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libutil/hash.cc b/src/libutil/hash.cc
index 599d375dca2f..cd7043090ec7 100644
--- a/src/libutil/hash.cc
+++ b/src/libutil/hash.cc
@@ -22,6 +22,7 @@ Hash::Hash(HashType type)
     else if (type == htSHA1) hashSize = sha1HashSize;
     else if (type == htSHA256) hashSize = sha256HashSize;
     else throw Error("unknown hash type");
+    assert(hashSize <= maxHashSize);
     memset(hash, 0, hashSize);
 }