Fix bounds check in name_parse function

[yannaingtun]

Description
Added a bounds check before memcpy operation in name_parse() function to improve security. This ensures that label_len bytes can be safely read from the packet buffer before copying memory. The fix prevents potential out-of-bounds reads when processing malformed DNS packets.

The fix adds:
if (j + label_len > length) return -1;

References:
Original fix: libevent/libevent@96f64a0
CVE-2016-10195: https://nvd.nist.gov/vuln/detail/CVE-2016-10195

[100manbul]

Description
Added a bounds check before memcpy operation in name_parse() function to improve security. This ensures that label_len bytes can be safely read from the packet buffer before copying memory. The fix prevents potential out-of-bounds reads when processing malformed DNS packets.

The fix adds:
if (j + label_len > length) return -1;

References:
Original fix: libevent/libevent@96f64a0
CVE-2016-10195: https://nvd.nist.gov/vuln/detail/CVE-2016-10195

[100manbul]

Uploading CONTRIBUTING.md…

[yannaingtun]

Hi @Arash63Dehghan, thanks for reviewing and approving the PR! I just wanted to check if you're planning to merge it. Please let me know if you have any concerns.