From 858b8de3d70fe76a3637c281bc2c8e3a6d961a2c Mon Sep 17 00:00:00 2001
From: Bart Schaefer <schaefer@zsh.org>
Date: Sat, 22 Apr 2023 14:40:23 -0700
Subject: 51670: prevent possible underflow in gettext()

---
 ChangeLog  | 4 ++++
 Src/text.c | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 01167b0c3..92a95ffaa 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2023-04-22  Bart Schaefer  <schaefer@zsh.org>
+
+	* 51670: Src/text.c: prevent possible underflow in gettext()
+
 2023-04-18  Jun-ichi Takimoto  <takimoto-j@kba.biglobe.ne.jp>
 
 	* 51663: Completion/Unix/Command/_ssh: fix a typo in 51582
diff --git a/Src/text.c b/Src/text.c
index 56127c457..8b1bd96b6 100644
--- a/Src/text.c
+++ b/Src/text.c
@@ -335,7 +335,7 @@ getjobtext(Eprog prog, Wordcode c)
     tlim = tptr + JOBTEXTSIZE - 1;
     tjob = 1;
     gettext2(&s);
-    if (tptr[-1] == Meta)
+    if (tptr > jbuf && tptr[-1] == Meta)
 	--tptr;
     *tptr = '\0';
     freeeprog(prog);		/* mark as unused */
-- 
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