Bug in decoding certain options fixed.

See RT ticket #17188 for more.

RELNOTES

@@ -74,6 +74,9 @@ suggested fixes to <dhcp-users@isc.org>.
 
 - Compilation with DLPI and -Werror has been repaired.
 
+- Error in decoding IA_NA option if multiple interfaces are present 
+  fixed by Marcus Goller.
+
 			Changes since 4.0.0a2
 
 - Fix for startup where there are no IPv4 addresses on an interface.

common/options.c

@@ -244,7 +244,7 @@ int parse_option_buffer (options, buffer, length, universe)
 
 				nop->data.buffer = NULL;
 				buffer_reference(&nop->data.buffer, bp, MDL);
-				nop->data.data = bp->data;
+				nop->data.data = bp->data + offset;
 				nop->data.len = len;
 
 				option_cache_reference(&op->next, nop, MDL);