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https://issues.apache.org/jira/browse/WW-5834?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lukasz Lenart resolved WW-5834.
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Resolution: Fixed
> NumberConverter parses numeric strings of any length
> -----------------------------------------------------
>
> Key: WW-5834
> URL: https://issues.apache.org/jira/browse/WW-5834
> Project: Struts 2
> Issue Type: Bug
> Components: Core
> Affects Versions: 6.12.0, 7.0.0, 7.3.0, 7.4.0
> Reporter: Gouri Sankar A
> Priority: Minor
> Fix For: 7.5.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> NumberConverter converts a String to a boxed number, BigInteger, BigDecimal,
> Double or Float with new BigInteger(String), new BigDecimal(String) and
> DecimalFormat.parse. Parsing a digit string with these is quadratic in its
> length. The value of a request parameter has no length limit in
> ParametersInterceptor (only the parameter name is limited to 100 characters),
> so a long digit string bound to such a property costs CPU out of proportion
> to its size. A primitive int property is not affected in the same way (the
> parse fails fast).
> Measured on main against a running Struts Boot app: one POST with an Integer
> property and a BigDecimal property, each given the same N-digit value. N =
> 100 digits: 0.03 s; 100,000 digits: 0.31 s; 400,000 digits: 3.98 s (the cost
> grows faster than the input). With the change: 100,000 digits 0.014 s and
> 400,000 digits 0.016 s (the value is rejected as a conversion error).
> Limits: the cost is CPU, not memory. It needs a boxed number, BigInteger or
> BigDecimal property that can be set from a request parameter (with
> @StrutsParameter). The request body size is still bounded by the container.
> Affected versions: the same parsing code (new BigInteger(stringValue),
> NumberFormat.parse on the unbounded string) is present in the NumberConverter
> of the 6.12.0, 7.0.0, 7.3.0 and 7.4.0 tags, by source inspection. The
> measurement was only run on main.
> Proposal: reject strings longer than 1000 characters with a
> TypeConversionException before any parsing. 1000 is well above any number the
> framework produces (StringConverter output is at most 681 characters:
> grouping off, 340 integer + 340 fraction digits + separator) and above the
> longest existing test value. The exception is reported as the usual field
> conversion error. Surrounding whitespace is trimmed by XWorkBasicConverter
> before NumberConverter sees the value, so it does not count against the limit.
> Tests: NumberConverterTest.testExceptionWhenNumberIsTooLong,
> testStringToBigDecimalConversionWithMaxLength;
> XWorkConverterTest.testFieldErrorMessageAddedWhenNumberIsTooLong,
> testSurroundingWhitespaceIsNotCountedAgainstMaxNumberLength.
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