From 0908384e91060c83323581515cfd1cf414cdf1ce Mon Sep 17 00:00:00 2001
From: subotac <73706465+subotac@users.noreply.github.com>
Date: Fri, 7 Aug 2026 15:21:02 +0300
Subject: [PATCH 1/2] printf: avoid overflow for minimum dynamic width

---
 src/uucore/src/lib/features/format/spec.rs | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/uucore/src/lib/features/format/spec.rs b/src/uucore/src/lib/features/format/spec.rs
index 1af75ae94d4..e7fb7406374 100644
--- a/src/uucore/src/lib/features/format/spec.rs
+++ b/src/uucore/src/lib/features/format/spec.rs
@@ -511,7 +511,7 @@ fn resolve_asterisk_width(
         Some(CanAsterisk::Asterisk(loc)) => {
             let nb = args.next_i64(loc);
             if nb < 0 {
-                Some((usize::try_from(-(nb as isize)).ok().unwrap_or(0), true))
+                Some((usize::try_from(nb.unsigned_abs()).ok().unwrap_or(0), true))
             } else {
                 Some((usize::try_from(nb).ok().unwrap_or(0), false))
             }
@@ -670,6 +670,17 @@ mod tests {
                 )
             );
         }
+
+        #[test]
+        fn asterisk_with_i64_min_width() {
+            assert_eq!(
+                Some((1usize.checked_shl(63).unwrap_or(0), true)),
+                resolve_asterisk_width(
+                    Some(CanAsterisk::Asterisk(ArgumentLocation::NextArgument)),
+                    &mut FormatArguments::new(&[FormatArgument::SignedInt(i64::MIN)]),
+                )
+            );
+        }
     }
 
     mod resolve_asterisk_precision {

From bdbb205337dffd6d8cd582324633b3f4bdb4fac2 Mon Sep 17 00:00:00 2001
From: subotac <73706465+subotac@users.noreply.github.com>
Date: Sun, 9 Aug 2026 04:09:34 +0300
Subject: [PATCH 2/2] tests/printf: cover minimum dynamic width

---
 tests/by-util/test_printf.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tests/by-util/test_printf.rs b/tests/by-util/test_printf.rs
index fda7f7d158e..fda259dbe52 100644
--- a/tests/by-util/test_printf.rs
+++ b/tests/by-util/test_printf.rs
@@ -590,6 +590,16 @@ fn sub_any_asterisk_first_param_with_integer() {
         .stdout_only("|0  |");
 }
 
+#[test]
+#[cfg(target_pointer_width = "64")]
+fn sub_any_asterisk_first_param_with_i64_min() {
+    new_ucmd!()
+        .args(&["%*d", &i64::MIN.to_string(), "1"])
+        .fails_with_code(1)
+        .stderr_contains("write error")
+        .stdout_is("");
+}
+
 #[test]
 fn sub_any_asterisk_second_param_with_integer() {
     new_ucmd!()