Properly initialize mmdb_lookup_t.

Set our initial geographic coordinates to DBL_MAX, otherwise we might
give people the wrong impression about the PIRATA weather buoy at 0°0'0"
N 0°0'0" E.

Change-Id: I34683883ef02c4fe40d5d93a7695d0cca277345c
Reviewed-on: https://code.wireshark.org/review/26463
Petri-Dish: Gerald Combs <gerald@wireshark.org>
Tested-by: Petri Dish Buildbot
Reviewed-by: Gerald Combs <gerald@wireshark.org>

1 files changed, 8 insertions, 3 deletions

diff --git a/epan/maxmind_db.c b/epan/maxmind_db.c
index 033b76dcc1..1151801a98 100644
--- a/epan/maxmind_db.c
+++ b/epan/maxmind_db.c
@@ -127,6 +127,11 @@ static const void *chunkify_v6_addr(const ws_in6_addr *addr) {
     return chunk_v6_bytes;
 }
 
+static void init_lookup(mmdb_lookup_t *lookup) {
+    mmdb_lookup_t empty_lookup = { FALSE, NULL, NULL, NULL, 0, NULL, DBL_MAX, DBL_MAX };
+    *lookup = empty_lookup;
+}
+
 static gboolean
 process_mmdbr_stdout(void) {
 
@@ -157,11 +162,11 @@ process_mmdbr_stdout(void) {
             // [init] or resolved address in square brackets.
             line[line_len - 1] = '\0';
             g_strlcpy(cur_addr, line + 1, WS_INET6_ADDRSTRLEN);
-            memset(&cur_lookup, 0, sizeof(cur_lookup));
+            init_lookup(&cur_lookup);
         } else if (strcmp(line, RES_STATUS_ERROR) == 0) {
             // Error during init.
             cur_addr[0] = '\0';
-            memset(&cur_lookup, 0, sizeof(cur_lookup));
+            init_lookup(&cur_lookup);
             mmdb_resolve_stop();
         } else if (val_start && g_str_has_prefix(line, RES_COUNTRY_ISO_CODE)) {
             cur_lookup.found = TRUE;
@@ -205,7 +210,7 @@ process_mmdbr_stdout(void) {
                 }
             }
             cur_addr[0] = '\0';
-            memset(&cur_lookup, 0, sizeof(cur_lookup));
+            init_lookup(&cur_lookup);
         }
     }