From 534e631b00a3b065016df23aa0f6b7d043e9ed86 Mon Sep 17 00:00:00 2001
From: "Basil L. Contovounesios" <contovob@tcd.ie>
Date: Sat, 4 Sep 2021 17:04:26 +0100
Subject: [PATCH] Avoid segfault in command-modes

* src/data.c (Fcommand_modes): Check that bytecode object is
interactive before accessing its interactive spec to avoid
segfaulting (bug#50376).
---
 src/data.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/data.c b/src/data.c
index ffca7e75355..27b642df286 100644
--- a/src/data.c
+++ b/src/data.c
@@ -1045,6 +1045,8 @@ The value, if non-nil, is a list of mode name symbols.  */)
 
   if (COMPILEDP (fun))
     {
+      if (PVSIZE (fun) <= COMPILED_INTERACTIVE)
+	return Qnil;
       Lisp_Object form = AREF (fun, COMPILED_INTERACTIVE);
       if (VECTORP (form))
 	/* New form -- the second element is the command modes. */
-- 
2.39.2