commit 997cd1a17f030d004b334d17cf1c1c57050c9906
author Bram Moolenaar <Bram@vim.org> Mon Aug 31 22:16:08 2020 +0200
committer Bram Moolenaar <Bram@vim.org> Mon Aug 31 22:16:08 2020 +0200
tree ca8ec548662f733807f6d2a293647ab92b668f1d
parent 39f7aa3c3124065b50f182b1d2f7ac92a0918656

patch 8.2.1557: crash in :vimgrep when started as "vim -n"

Problem:    Crash in :vimgrep when started as "vim -n". (Raul Segura)
Solution:   Check mfp pointer. (Yegappan Lakshmanan, closes #6827)

src/quickfix.c

diff --git a/src/quickfix.c b/src/quickfix.c
index 99b0169..f8ff776 100644
--- a/src/quickfix.c
+++ b/src/quickfix.c
@@ -6022,7 +6022,7 @@
     static int
 existing_swapfile(buf_T *buf)
 {
-    if (buf->b_ml.ml_mfp != NULL)
+    if (buf->b_ml.ml_mfp != NULL && buf->b_ml.ml_mfp->mf_fname != NULL)
     {
 	char_u *fname = buf->b_ml.ml_mfp->mf_fname;
 	size_t len = STRLEN(fname);