Backported upstream patch, Fixed allocation typo leading to crash

diffutils-3.11-allocation-typo-leading-to-crashes.patch

@@ -0,0 +1,26 @@
+diff --git a/NEWS b/NEWS
+index 73d98d6..bfc4035 100644
+--- a/NEWS
++++ b/NEWS
+@@ -8,6 +8,9 @@ GNU diffutils NEWS                                    -*- outline -*-
+   file to a nonempty regular file.
+   [bug#76452 introduced in 3.11]
+ 
++  diff -y no longer crashes when given nontrivial differences.
++  [bug#76613 introduced in 3.11]
++
+ 
+ * Noteworthy changes in release 3.11 (2025-02-02) [stable]
+ 
+diff --git a/src/io.c b/src/io.c
+index a62c529..eba4aba 100644
+--- a/src/io.c
++++ b/src/io.c
+@@ -1012,7 +1012,7 @@ find_and_hash_each_line (struct file_data *current)
+ 	  linbuf += linbuf_base;
+ 	  linbuf = xpalloc (linbuf, &n, 1, -1, sizeof *linbuf);
+ 	  linbuf -= linbuf_base;
+-	  alloc_lines = n - linbuf_base;
++	  alloc_lines = linbuf_base + n;
+         }
+       linbuf[line] = p;

diffutils.spec

@@ -1,9 +1,11 @@
 Summary: GNU collection of diff utilities
 Name: diffutils
 Version: 3.11
-Release: 1%{?dist}
+Release: 2%{?dist}
 URL: https://www.gnu.org/software/diffutils/diffutils.html
 Source: https://ftp.gnu.org/gnu/diffutils/diffutils-%{version}.tar.xz
+# upstream fixes
+Patch10: diffutils-3.11-allocation-typo-leading-to-crashes.patch
 License: GPL-3.0-or-later
 Provides: bundled(gnulib)
 BuildRequires: gcc
@@ -53,6 +55,9 @@ make check
 %{_infodir}/diffutils.info*
 
 %changelog
+* Thu Mar 27 2025 Than Ngo <than@redhat.com> - 3.11-2
+- Backported upstream patch, Fixed allocation typo leading to crash
+
 * Thu Mar 27 2025 Than Ngo <than@redhat.com> - 3.11-1
 - Fixed rhbz#2343469, Update to 3.11