Fix #81400: Unterminated string in dns_get_record() results#7427
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If we assemble a zend_string manually, we need to end it with a NUL byte ourselves. We also fix the size calculation for that zend_string; there is no need for the extra byte for each part, and we don't have to multiply by two, since we're using DnsQuery_A(), not DnsQuery_W () (in which case we would have to do the character set conversion, anyway). This avoids over-allocation, and the need to explicitly set the string length. Finally, we use the proper access macro for zend_strings.
nikic
approved these changes
Aug 30, 2021
sgolemon
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Aug 30, 2021
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If we assemble a zend_string manually, we need to end it with a NUL
byte ourselves.
We also fix the size calculation for that zend_string; there is no need
for the extra byte for each part, and we don't have to multiply by two,
since we're using DnsQuery_A(), not DnsQuery_W () (in which case we
would have to do the character set conversion, anyway). This avoids
over-allocation, and the need to explicitly set the string length.
Finally, we use the proper access macro for zend_strings.