Perform back off and retry on failed realloc in jansson strbuffer_append_bytes instead of failing

src/jansson-2.6/src/strbuffer.c

@@ -11,6 +11,7 @@
 
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h>
 #include "jansson_private.h"
 #include "strbuffer.h"
 
@@ -74,6 +75,7 @@ int strbuffer_append_bytes(strbuffer_t *strbuff, const char *data, size_t size)
 {
     if(size >= strbuff->size - strbuff->length)
     {
+	int backoff = 1;
         size_t new_size;
         char *new_value;
 
@@ -86,9 +88,13 @@ int strbuffer_append_bytes(strbuffer_t *strbuff, const char *data, size_t size)
         new_size = max(strbuff->size * STRBUFFER_FACTOR,
                        strbuff->length + size + 1);
 
-        new_value = realloc(strbuff->value, new_size);
-        if(!new_value)
-            return -1;
+	while (42) {
+		new_value = realloc(strbuff->value, new_size);
+		if (new_value)
+			break;
+		usleep(backoff * 1000);
+		backoff <<= 1;
+	}
 
         strbuff->value = new_value;
         strbuff->size = new_size;