fix gethostby*_r result pointer value on error

according to the documentation in the man pages, the GNU extension
functions gethostbyaddr_r, gethostbyname_r and gethostbyname2_r are
guaranteed to set the result pointer to NULL in case of error or no
result.

diff --git a/src/network/gethostbyaddr_r.c b/src/network/gethostbyaddr_r.c
index 73e7644..66e0330 100644 (file)
--- a/src/network/gethostbyaddr_r.c
+++ b/src/network/gethostbyaddr_r.c
@@ -18,6 +18,8 @@ int gethostbyaddr_r(const void *a, socklen_t l, int af,
        socklen_t sl = af==AF_INET6 ? sizeof sa.sin6 : sizeof sa.sin;
        int i;
 
+       *res = 0;
+
        /* Load address argument into sockaddr structure */
        if (af==AF_INET6 && l==16) memcpy(&sa.sin6.sin6_addr, a, 16);
        else if (af==AF_INET && l==4) memcpy(&sa.sin.sin_addr, a, 4);

diff --git a/src/network/gethostbyname2_r.c b/src/network/gethostbyname2_r.c
index aa8b0a9..81f71d2 100644 (file)
--- a/src/network/gethostbyname2_r.c
+++ b/src/network/gethostbyname2_r.c
@@ -17,6 +17,7 @@ int gethostbyname2_r(const char *name, int af,
        int i, cnt;
        size_t align, need;
 
+       *res = 0;
        cnt = __lookup_name(addrs, canon, name, af, AI_CANONNAME);
        if (cnt<0) switch (cnt) {
        case EAI_NONAME: