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.

diff --git a/src/network/lookup_name.c b/src/network/lookup_name.c
index fb7303a..066be4d 100644 (file)
--- a/src/network/lookup_name.c
+++ b/src/network/lookup_name.c
@@ -338,8 +338,8 @@ int __lookup_name(struct address buf[static MAXADDRS], char canon[static 256], c
        /* No further processing is needed if there are fewer than 2
         * results or if there are only IPv4 results. */
        if (cnt<2 || family==AF_INET) return cnt;
-       for (i=0; buf[i].family == AF_INET; i++)
-               if (i==cnt) return cnt;
+       for (i=0; i<cnt; i++) if (buf[i].family != AF_INET) break;
+       if (i==cnt) return cnt;
 
        int cs;
        pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);