Fix ares_getaddrinfo() numerical address fast path with AF_UNSPEC - #469
Merged
Conversation
The conversion of numeric IPv4 addresses in fake_addrinfo() is broken when the family is AF_UNSPEC. The initial call to ares_inet_pton with AF_INET will succeed, but the subsequent call using AF_INET6 will fail. This results in the fake_addrinfo() fast path failing, and ares_getaddrinfo() making a query when none should be required. Resolve this by only attempting the call to ares_inet_pton with AF_INET6 if the initial call with AF_INET was unsuccessful.
ridgek
marked this pull request as ready for review
May 30, 2022 01:55
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
The conversion of numeric IPv4 addresses in fake_addrinfo() is broken when
the family is AF_UNSPEC. The initial call to ares_inet_pton with AF_INET
will succeed, but the subsequent call using AF_INET6 will fail. This results
in the fake_addrinfo() fast path failing, and ares_getaddrinfo() making a
query when none should be required.
Resolve this by only attempting the call to ares_inet_pton with AF_INET6
if the initial call with AF_INET was unsuccessful.