commit 0d90e728fe089ff1bb34d6a17f5591a96b57f734
author Bram Moolenaar <Bram@vim.org> Tue Nov 03 18:20:19 2020 +0100
committer Bram Moolenaar <Bram@vim.org> Tue Nov 03 18:20:19 2020 +0100
tree c4e8d1b172ee4660250ab06fa1d9781553e7f1c7
parent 6fd3a4ba2320c4a95f02daef5f2ac76d3105d013

patch 8.2.1945: crash when passing NULL function to reduce()

Problem:    Crash when passing NULL function to reduce().
Solution:   Check for NULL pointer and give an error. (Dominique Pellé,
            closes #7243)

src/list.c

diff --git a/src/list.c b/src/list.c
index 1da4f3d..beea6fa 100644
--- a/src/list.c
+++ b/src/list.c
@@ -2552,8 +2552,11 @@
     }
     else
 	func_name = tv_get_string(&argvars[1]);
-    if (*func_name == NUL)
-	return;		// type error or empty name
+    if (func_name == NULL || *func_name == NUL)
+    {
+	emsg(_(e_missing_function_argument));
+	return;
+    }
 
     vim_memset(&funcexe, 0, sizeof(funcexe));
     funcexe.evaluate = TRUE;