From a59f2dfd0cf9ee1a584d3de5b7c2d47648e79060 Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Wed, 11 May 2022 11:42:28 +0100
Subject: [PATCH] patch 8.2.4938: crash when matching buffer with invalid
 pattern

Problem:    Crash when matching buffer with invalid pattern.
Solution:   Check for NULL regprog.
---
 src/buffer.c                | 2 +-
 src/testdir/test_buffer.vim | 4 ++++
 src/version.c               | 2 ++
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/buffer.c b/src/buffer.c
index 35711f5feb320..dfdb0c430d95a 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -2932,7 +2932,7 @@ buflist_match(
 
     // First try the short file name, then the long file name.
     match = fname_match(rmp, buf->b_sfname, ignore_case);
-    if (match == NULL)
+    if (match == NULL && rmp->regprog != NULL)
 	match = fname_match(rmp, buf->b_ffname, ignore_case);
 
     return match;
diff --git a/src/testdir/test_buffer.vim b/src/testdir/test_buffer.vim
index aea3995587078..55ef0fda76209 100644
--- a/src/testdir/test_buffer.vim
+++ b/src/testdir/test_buffer.vim
@@ -415,6 +415,10 @@ func Test_buf_pattern_invalid()
   vsplit 0000000
   silent! buf [0--]\&\zs*\zs*e
   bwipe!
+
+  vsplit 00000000000000000000000000
+  silent! buf [0--]\&\zs*\zs*e
+  bwipe!
 endfunc
 
 " Test for the 'maxmem' and 'maxmemtot' options
diff --git a/src/version.c b/src/version.c
index 8cc9cebac3863..0a3a5df8bc97e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -746,6 +746,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4938,
 /**/
     4937,
 /**/