sanity check before copy with new memory bio

2022-03-30 14:02:03 -07:00
parent a914d782c0
commit 8136c55a39
1 changed files with 3 additions and 1 deletions
--- a/src/bio.c
+++ b/src/bio.c
@@ -2545,7 +2545,9 @@ int wolfSSL_BIO_flush(WOLFSSL_BIO* bio)
        bio->num = (int)bio->mem_buf->max;
        bio->wrSz = len;
        bio->ptr = bio->mem_buf->data;
-        XMEMCPY(bio->ptr, buf, len);
+        if (len > 0 && bio->ptr != NULL) {
+            XMEMCPY(bio->ptr, buf, len);
+        }

        return bio;
    }