1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/builtin_openssl2/crypto/buffer/buf_str.c b/drivers/builtin_openssl2/crypto/buffer/buf_str.c
index 233af246e4..fa0d608e76 100644
--- a/drivers/builtin_openssl2/crypto/buffer/buf_str.c
+++ b/drivers/builtin_openssl2/crypto/buffer/buf_str.c
@@ -61,6 +61,15 @@
 #include <limits.h>
 #include <openssl/buffer.h>
 
+size_t BUF_strnlen(const char *str, size_t maxlen)
+{
+    const char *p;
+
+    for (p = str; maxlen-- != 0 && *p != '\0'; ++p) ;
+
+    return p - str;
+}
+
 char *BUF_strdup(const char *str)
 {
     if (str == NULL)
@@ -75,6 +84,8 @@ char *BUF_strndup(const char *str, size_t siz)
     if (str == NULL)
         return NULL;
 
+    siz = BUF_strnlen(str, siz);
+
     if (siz >= INT_MAX)
         return NULL;