tree c504ba01a156b537be6d61b2312386f33fcf8041
parent 9d44b6460ab603487dab4d916342d9ba4467e6b9
author Rich Felker <dalias@aerifal.cx> 1550703082 -0500
committer Rich Felker <dalias@aerifal.cx> 1550703082 -0500

fix invalid free of partial addrinfo list with multiple services

the backindex stored by getaddrinfo to allow freeaddrinfo to perform
partial-free wrongly used the address result index, rather than the
output slot index, and thus was only valid when they were equal
(nservs==1).

patch based on report with proposed fix by Markus Wichmann.