Huw Davies : dnsapi: Return ERROR_MORE_DATA on insufficient buffer.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 734de3bef82ff5456b27cca663f9e91e939f0c29
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=734de3bef82ff5456b27cca66...

Author: Huw Davies 
Date:   Mon Aug  9 10:06:25 2021 +0100

dnsapi: Return ERROR_MORE_DATA on insufficient buffer.

This was already done correctly in the res_getservers() case.

Signed-off-by: Huw Davies 
Signed-off-by: Alexandre Julliard

---

dlls/dnsapi/libresolv.c   | 2 +-
 dlls/dnsapi/tests/query.c | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/dlls/dnsapi/libresolv.c b/dlls/dnsapi/libresolv.c
index 7e545cf36fb..864c517333d 100644
--- a/dlls/dnsapi/libresolv.c
+++ b/dlls/dnsapi/libresolv.c
@@ -414,7 +414,7 @@ DNS_STATUS CDECL resolv_get_serverlist( USHORT family, DNS_ADDR_ARRAY *addrs, DW
     if (!addrs || *len < needed)
     {
         *len = needed;
-        return !addrs ? ERROR_SUCCESS : ERROR_INSUFFICIENT_BUFFER;
+        return !addrs ? ERROR_SUCCESS : ERROR_MORE_DATA;
     }
     *len = needed;
     memset( addrs, 0, needed );
diff --git a/dlls/dnsapi/tests/query.c b/dlls/dnsapi/tests/query.c
index 5fb47d89782..e691822a46a 100644
--- a/dlls/dnsapi/tests/query.c
+++ b/dlls/dnsapi/tests/query.c
@@ -155,6 +155,10 @@ static void test_DnsQueryConfig( void )
         err = DnsQueryConfig( DnsConfigDnsServersIpv4, 0, name, NULL, NULL, &size );
         if (err) continue;
         ipv4 = malloc( size );
+        size--;
+        err = DnsQueryConfig( DnsConfigDnsServersIpv4, 0, name, NULL, ipv4, &size );
+        ok( err == ERROR_MORE_DATA, "got %d\n", err );
+        size++;
         err = DnsQueryConfig( DnsConfigDnsServersIpv4, 0, name, NULL, ipv4, &size );
         ok( !err, "got %d\n", err );