From: Paul Eggert <eggert@cs.ucla.edu>
Subject: diff: fix allocation typo leading to crashes
Date: Fri Feb 28 22:53:28 2025 -0800
Git-repo: https://git.savannah.gnu.org/git/diffutils.git
Git-commit: e9f8e6a439fd607adbdd846ab93267dc367b5c79
References: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=77265
Signed-off-by: Tony Jones <tonyj@suse.de>

    diff: fix allocation typo leading to crashes
    
    But reported by Nick Smallbone, with one-line fix by
    Collin Funk <https://bugs.gnu.org/76613>.
    * src/io.c (find_and_hash_each_line): Fix size computation.

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;