musl - gethostbyname2.c / 6476b8135760659b25c93ff9308425ca98a9e777 breaking asterisk 13 compatibility

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Date: Thu, 24 Aug 2017 13:39:08 +0200
From: Pirmin Walthert <pirmin.walthert@...om.ch>
To: musl@...ts.openwall.com
Subject: gethostbyname2.c / 6476b8135760659b25c93ff9308425ca98a9e777
 breaking asterisk 13 compatibility

Hello

First thing: http://git.musl-libc.org/cgit/musl/commit/?id=6476b8135760
659b25c93ff9308425ca98a9e777 seems to break Asterisk compatibilty.
Asterisk crashes on every startup while loading modules. Using musl-git 
combined with the latest dynlink.c version before this commit works
fine. (1.1.16 has some startup crashes as well because of the bug fixed
with 27b3fd68f67b674440d21ea7ca5cf918d2e1559f).

Second: I'm currently debugging a strange memory corruption problem and
have just had a look at the gethostbyname2.c code:

I was wondering: why is it safe to do free(h) on the initial run when
*h has not been 

        static struct hostent *h;
        size_t size = 63;
        struct hostent *res;
        int err;
        do {
                free(h);

Best regards,

Pirmin

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