https://bugs.gentoo.org/922474
https://www.openwall.com/lists/oss-security/2024/01/18/2
https://git.savannah.gnu.org/cgit/coreutils.git/commit/?id=c4c5ed8f4e9cd55a12966d4f520e3a13101637d9

From c4c5ed8f4e9cd55a12966d4f520e3a13101637d9 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Tue, 16 Jan 2024 13:48:32 -0800
Subject: split: do not shrink hold buffer
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* src/split.c (line_bytes_split): Do not shrink hold buffer.
If it’s large for this batch it’s likely to be large for the next
batch, and for ‘split’ it’s not worth the complexity/CPU hassle to
shrink it.  Do not assume hold_size can be bufsize.
--- a/src/split.c
+++ b/src/split.c
@@ -809,10 +809,7 @@ line_bytes_split (intmax_t n_bytes, char *buf, idx_t bufsize)
             {
               cwrite (n_out == 0, hold, n_hold);
               n_out += n_hold;
-              if (n_hold > bufsize)
-                hold = xirealloc (hold, bufsize);
               n_hold = 0;
-              hold_size = bufsize;
             }
 
           /* Output to eol if present.  */
-- 
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