From f569bf66e90375f571f56fb5583ed8278ff93cfc Mon Sep 17 00:00:00 2001
From: arbee <rb6502@users.noreply.github.com>
Date: Tue, 4 Jun 2024 23:08:15 -0400
Subject: util/ioprocs.cpp: Count zero actual bytes written on a write call as
 an error.  Fixes lock-up writing to a write-protected image. [R. Belmont,
 Peter Ferrie]

---
 src/lib/util/ioprocs.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/lib/util/ioprocs.cpp b/src/lib/util/ioprocs.cpp
index 37a958713b3..a9a26ffd313 100644
--- a/src/lib/util/ioprocs.cpp
+++ b/src/lib/util/ioprocs.cpp
@@ -797,7 +797,7 @@ std::pair<std::error_condition, std::size_t> write(write_stream &stream, void co
 		std::size_t written;
 		std::error_condition err = stream.write_some(buffer, length, written);
 		actual += written;
-		if (err && (std::errc::interrupted != err))
+		if ((err || !actual) && (std::errc::interrupted != err))
 			return std::make_pair(err, actual);
 		buffer = reinterpret_cast<std::uint8_t const *>(buffer) + written;
 		length -= written;
-- 
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