From 4fe82a56ef93b8e0caf328f33fd15db6eea6bf0c Mon Sep 17 00:00:00 2001
From: Christopher Dryden <christopher.paul.dryden@gmail.com>
Date: Fri, 26 Dec 2025 01:49:44 +0000
Subject: [PATCH] dd: handle stderr write errors gracefully in progress output

---
 src/uu/dd/src/progress.rs | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/src/uu/dd/src/progress.rs b/src/uu/dd/src/progress.rs
index 2ad61cf1b30..416c95f27d5 100644
--- a/src/uu/dd/src/progress.rs
+++ b/src/uu/dd/src/progress.rs
@@ -18,7 +18,7 @@ use std::time::Duration;
 #[cfg(target_os = "linux")]
 use signal_hook::iterator::Handle;
 use uucore::{
-    error::UResult,
+    error::{UResult, set_exit_code},
     format::num_format::{FloatVariant, Formatter},
     locale::setup_localization,
     translate,
@@ -231,7 +231,9 @@ impl ProgUpdate {
     /// See [`ProgUpdate::write_io_lines`] for more information.
     pub(crate) fn print_io_lines(&self) {
         let mut stderr = std::io::stderr();
-        self.write_io_lines(&mut stderr).unwrap();
+        if self.write_io_lines(&mut stderr).is_err() {
+            set_exit_code(1);
+        }
     }
 
     /// Re-print the number of bytes written, duration, and throughput.
@@ -240,7 +242,9 @@ impl ProgUpdate {
     pub(crate) fn reprint_prog_line(&self) {
         let mut stderr = std::io::stderr();
         let rewrite = true;
-        self.write_prog_line(&mut stderr, rewrite).unwrap();
+        if self.write_prog_line(&mut stderr, rewrite).is_err() {
+            set_exit_code(1);
+        }
     }
 
     /// Write all summary statistics.
@@ -248,7 +252,9 @@ impl ProgUpdate {
     /// See [`ProgUpdate::write_transfer_stats`] for more information.
     pub(crate) fn print_transfer_stats(&self, new_line: bool) {
         let mut stderr = std::io::stderr();
-        self.write_transfer_stats(&mut stderr, new_line).unwrap();
+        if self.write_transfer_stats(&mut stderr, new_line).is_err() {
+            set_exit_code(1);
+        }
     }
 
     /// Write all the final statistics.