From c96a5ebe1338b5497af5248712261859dec648c6 Mon Sep 17 00:00:00 2001
From: Weixie Cui <cuiweixie@gmail.com>
Date: Fri, 27 Mar 2026 20:42:53 +0800
Subject: [PATCH] crypto/rand: return correct count on hardware RNG read error

When machine.GetRNG fails mid-read, return the number of bytes already
written (i) instead of n, which is still zero at that point.
---
 src/crypto/rand/rand_baremetal.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/crypto/rand/rand_baremetal.go b/src/crypto/rand/rand_baremetal.go
index 5711f23eb0..a8ff1dc8e7 100644
--- a/src/crypto/rand/rand_baremetal.go
+++ b/src/crypto/rand/rand_baremetal.go
@@ -26,7 +26,7 @@ func (r *reader) Read(b []byte) (n int, err error) {
 		if i%4 == 0 {
 			randomByte, err = machine.GetRNG()
 			if err != nil {
-				return n, err
+				return i, err
 			}
 		} else {
 			randomByte >>= 8