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Prevent buffer overrun while parsing an integer in a "query_int" value.
contrib/intarray's gettoken() uses a fixed-size buffer to collect an
integer's digits, and did not guard against overrunning the buffer.
This is at least a backend crash risk, and in principle might allow
arbitrary code execution. The code didn't check for overflow of the
integer value either, which while not presenting a crash risk was still
bad.
Thanks to Apple Inc's security team for reporting this issue and supplying
the fix.
Security: CVE-2010-4015