tree 829fe539b9b62f57e74b8daabebcadcbe7d20109
parent 54807d47acecab778498ced88ce8f62bfa16e379
author Rich Felker <dalias@aerifal.cx> 1491962491 -0400
committer Rich Felker <dalias@aerifal.cx> 1491962950 -0400

fix read past end of buffer in getaddrinfo backend

due to testing buf[i].family==AF_INET before checking i==cnt, it was
possible to read past the end of the array, or past the valid part. in
practice, without active bounds/indeterminate-value checking by the
compiler, the worst that happened was failure to return early and
optimize out the sorting that's unneeded for v4-only results.

returning on i==cnt-1 rather than i==cnt would be an alternate fix,
but the approach this patch takes is more idiomatic and less
error-prone.

patch by Timo Teräs.