diff --git a/hw/misc/aspeed_hace.c b/hw/misc/aspeed_hace.c
index 32a5dbded3..d75da33353 100644
--- a/hw/misc/aspeed_hace.c
+++ b/hw/misc/aspeed_hace.c
@@ -128,6 +128,11 @@ static bool has_padding(AspeedHACEState *s, struct iovec *iov,
     if (*total_msg_len <= s->total_req_len) {
         uint32_t padding_size = s->total_req_len - *total_msg_len;
         uint8_t *padding = iov->iov_base;
+
+        if (padding_size > req_len) {
+            return false;
+        }
+
         *pad_offset = req_len - padding_size;
         if (padding[*pad_offset] == 0x80) {
             return true;