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-rw-r--r--activesupport/lib/active_support/message_verifier.rb4
1 files changed, 2 insertions, 2 deletions
diff --git a/activesupport/lib/active_support/message_verifier.rb b/activesupport/lib/active_support/message_verifier.rb
index 8d14423d91..3e72100bd9 100644
--- a/activesupport/lib/active_support/message_verifier.rb
+++ b/activesupport/lib/active_support/message_verifier.rb
@@ -41,8 +41,8 @@ module ActiveSupport
if "foo".respond_to?(:force_encoding)
# constant-time comparison algorithm to prevent timing attacks
def secure_compare(a, b)
- a = a.force_encoding(Encoding::BINARY)
- b = b.force_encoding(Encoding::BINARY)
+ a = a.dup.force_encoding(Encoding::BINARY)
+ b = b.dup.force_encoding(Encoding::BINARY)
if a.length == b.length
result = 0