[SERVER-12204] Buffer::readUTF8String in bson_validate.cpp should validate utf8 - MongoDB Jira

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Currently it does not. readCString probably should too, but at least UTF8 isn't part of it's name.

Example failing test:

    TEST(BSONValidateFast, InvalidUTF8) {

        BSONObj x = BSON("invalidUTF8" << "\xFF"); // this byte should never be in well-formed utf8.

        ASSERT_NOT_OK(validateBSON(x.objdata(), x.objsize()));

documents

SERVER-27426 validateBSON should assert that Array elements have indexes from 0...n

duplicates

SERVER-21753 Improve UTF-8 validation of BSON documents

related to

SERVER-51083 Problem with regex index bounds

SERVER-29466 Cannot query over fields containing invalid UTF-8