filter_rewrite_tag: add NULL check(fluent#4246)

Signed-off-by: Takahiro Yamashita <[email protected]>
matthewfala · Nov 29, 2021 · 8a19124 · 8a19124
1 parent 6711442
commit 8a19124
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/plugins/filter_rewrite_tag/rewrite_tag.c b/plugins/filter_rewrite_tag/rewrite_tag.c
@@ -181,9 +181,14 @@ static int process_config(struct flb_rewrite_tag *ctx)
 
 static int is_wildcard(char* match)
 {
-    size_t len = strlen(match);
+    size_t len;
     size_t i;
 
+    if (match == NULL) {
+        return 0;
+    }
+    len = strlen(match);
+
     /* '***' should be ignored. So we check every char. */
     for (i=0; i<len; i++) {
         if (match[i] != '*') {