From e7a00928bd3b15610fc3d1d0e4e4c26acdb2bc13 Mon Sep 17 00:00:00 2001
From: Aidan Garske <aidan@wolfssl.com>
Date: Tue, 8 Sep 2026 11:27:28 -0700
Subject: [PATCH] F-13458 - Stop the extend hashing loop on a short or failed
 read

---
 examples/pcr/extend.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/examples/pcr/extend.c b/examples/pcr/extend.c
index 6926b0d1..f9a5138b 100644
--- a/examples/pcr/extend.c
+++ b/examples/pcr/extend.c
@@ -162,11 +162,19 @@ int TPM2_PCR_Extend_Test(void* userCtx, int argc, char *argv[])
         rc = wc_HashInit(&dig, hashType);
         if (rc == 0)
             hashInitialized = 1;
-        while (rc == 0 && !XFEOF(fp)) {
+        while (rc == 0) {
             len = XFREAD(dataBuffer, 1, sizeof(dataBuffer), fp);
             if (len > 0) {
                 rc = wc_HashUpdate(&dig, hashType, dataBuffer, (int)len);
             }
+            if (len < sizeof(dataBuffer)) {
+                /* Short read: end of file, or an input error to report */
+                if (!XFEOF(fp)) {
+                    printf("Error reading file %s\n", filename);
+                    rc = BAD_FUNC_ARG;
+                }
+                break;
+            }
         }
         XFCLOSE(fp);
         if (rc == 0)