out_es: check if converted_size is 0 to prevent SIGFPE(#3905)

We updated re-allocation logic(#3788). It tries to divide by converted_size. If converted_size is 0, it causes SIGFPE and exit code 136. Signed-off-by: Takahiro Yamashita <[email protected]>
fluent · Aug 13, 2021 · 9d212bf · 9d212bf
1 parent b2aba7e
commit 9d212bf
Showing 1 changed file with 10 additions and 4 deletions.
diff --git a/plugins/out_es/es_bulk.c b/plugins/out_es/es_bulk.c
@@ -78,11 +78,17 @@ int es_bulk_append(struct es_bulk *bulk, char *index, int i_len,
          *    1. rest of msgpack data size
          *    2. ratio from bulk json size and processed msgpack size.
          */
-        append_size = (whole_size - converted_size) /* rest of size to convert */
-                    * (bulk->size / converted_size); /* = json size / msgpack size */
-        if (append_size < ES_BULK_CHUNK) {
-            /* append at least ES_BULK_CHUNK size */
+        if (converted_size == 0) {
+            /* converted_size = 0 causes div/0 */
+            flb_debug("[out_es] converted_size is 0");
             append_size = ES_BULK_CHUNK;
+        } else {
+            append_size = (whole_size - converted_size) /* rest of size to convert */
+                        * (bulk->size / converted_size); /* = json size / msgpack size */
+            if (append_size < ES_BULK_CHUNK) {
+                /* append at least ES_BULK_CHUNK size */
+                append_size = ES_BULK_CHUNK;
+            }
         }
         ptr = flb_realloc(bulk->ptr, bulk->size + append_size);
         if (!ptr) {