Tests: Fix a couple of valgrind complaints (#1554)

Fix valgrind issues regarding:

- Unclosed log file descriptor in libclamav unit test program.
  Also need to disable debug logging for `iconv_cache_destroy()` for this
  or else it will try to use that file descriptor after `main()` exits.

- Unclosed socket file descriptor in ClamDScan when doing `ping()`
  function.

CLAM-2872

clamdscan/client.c

@@ -175,7 +175,7 @@ int16_t ping_clamd(const struct optstruct *opts)
     char *errchk                = NULL;
     uint64_t i                  = 0;
     const struct optstruct *opt = NULL;
-    int64_t sockd;
+    int64_t sockd               = -1;
     struct RCVLN rcv;
     uint16_t ret = 0;
 
@@ -227,6 +227,7 @@ int16_t ping_clamd(const struct optstruct *opts)
             if (sendln(sockd, zPING, sizeof(zPING))) {
                 logg(LOGG_DEBUG, "PING failed...\n");
                 closesocket(sockd);
+                sockd = -1;
             } else {
                 if (!optget(opts, "wait")->enabled) {
                     logg(LOGG_INFO, "PONG\n");
@@ -262,6 +263,9 @@ int16_t ping_clamd(const struct optstruct *opts)
     }
 
 done:
+    if (sockd >= 0) {
+        closesocket(sockd);
+    }
     if (attempt_str) {
         free(attempt_str);
     }

libclamav/entconv.c

@@ -526,9 +526,11 @@ static void iconv_cache_init(struct iconv_cache* cache)
 static void iconv_cache_destroy(struct iconv_cache* cache)
 {
     size_t i;
-    cli_dbgmsg(MODULE_NAME "Destroying iconv pool:%p\n", (void*)cache);
+    // Don't use cli_dbgmsg() in destroy, because this happens *after* main() exits and we've already closed the log file handle.
+    //printf(MODULE_NAME "Destroying iconv pool:%p\n", (void*)cache);
     for (i = 0; i < cache->last; i++) {
-        cli_dbgmsg(MODULE_NAME "closing iconv:%p\n", cache->tab[i]);
+        // Don't log on destroy, because this happens *after* main() exits and we've already closed the log file handle.
+        //printf(MODULE_NAME "closing iconv:%p\n", cache->tab[i]);
         iconv_close(cache->tab[i]);
     }
     cli_hashtab_clear(&cache->hashtab);

unit_tests/check_clamav.c

@@ -2012,6 +2012,7 @@ int main(int argc, char **argv)
     int nf;
     Suite *s;
     SRunner *sr;
+    FILE *log_file = NULL;
 
     UNUSEDPARAM(argc);
     UNUSEDPARAM(argv);
@@ -2037,7 +2038,8 @@ int main(int argc, char **argv)
     srunner_add_suite(sr, test_bytecode_suite());
 
     srunner_set_log(sr, OBJDIR PATHSEP "test.log");
-    if (freopen(OBJDIR PATHSEP "test-stderr.log", "w+", stderr) == NULL) {
+    log_file = freopen(OBJDIR PATHSEP "test-stderr.log", "w+", stderr);
+    if (log_file == NULL) {
         // The stderr FILE pointer may be closed by `freopen()` even if redirecting to the log file files.
         // So we will output the error message to stdout instead.
         fputs("Unable to redirect stderr!\n", stdout);
@@ -2052,5 +2054,9 @@ int main(int argc, char **argv)
 
     xmlCleanupParser();
 
+    if (log_file) {
+        fclose(log_file);
+    }
+
     return (nf == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
 }