Fix check data length logic

If human-readable part dose not found, Bech32#decode returns nil.
sipa · May 11, 2017 · 590d898 · 590d898
1 parent 1274ee7
commit 590d898
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/ref/ruby/bech32.rb b/ref/ruby/bech32.rb
@@ -40,7 +40,7 @@ def decode(bech)
     bech = bech.downcase
     # check data length
     pos = bech.rindex(SEPARATOR)
-    return nil if pos.nil? || pos + 7 > bech.length || bech.length > 90
+    return nil if pos.nil? || pos < 1 || pos + 7 > bech.length || bech.length > 90
     # check valid charset
     bech[pos+1..-1].each_char{|c|return nil unless CHARSET.include?(c)}
     # split hrp and data