From 3bd69dda1ab212ab3549be48283497f5856df9dd Mon Sep 17 00:00:00 2001
From: Andrzej Kurek <andrzej.kurek@arm.com>
Date: Tue, 20 Nov 2018 03:03:28 -0500
Subject: [PATCH] pkwrite: add an explicit cast to size_t

---
 library/pkwrite.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/library/pkwrite.c b/library/pkwrite.c
index 3dfc590ad..d34714b34 100644
--- a/library/pkwrite.c
+++ b/library/pkwrite.c
@@ -173,7 +173,7 @@ int mbedtls_pk_write_pubkey( unsigned char **p, unsigned char *start,
         if ( *p < start )
             return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
 
-        buffer_size = *p - start;
+        buffer_size = (size_t)( *p - start );
         if ( psa_export_public_key( *key_slot, start, buffer_size, &len )
              != PSA_SUCCESS )
         {