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Fix integer overflow (CVE-2021-21309). (#8522)
On 32-bit systems, setting the proto-max-bulk-len config parameter to a high value may result with integer overflow and a subsequent heap overflow when parsing an input bulk (CVE-2021-21309). This fix has two parts: Set a reasonable limit to the config parameter. Add additional checks to prevent the problem in other potential but unknown code paths. (cherry picked from commit d32f2e9)
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