From f57a0301e3adfa5fd456404a200182c7f21da03a Mon Sep 17 00:00:00 2001
From: Jim Warner <james.warner@comcast.net>
Date: Wed, 9 Sep 2020 00:00:00 -0500
Subject: [PATCH] top: fix potential SEGV when no tasks were displayable

This patch fixes a nearly decade old bug discovered by
Frederik Deweerdt. His merge request shown below would
be an adequate solution except for iterative overhead.

This alternate patch will represent substantially less
overhead for an admittedly extremely rare possibility.

Reference(s):
https://gitlab.com/procps-ng/procps/-/merge_requests/114

And-thanks-to: Frederik Deweerdt <fdeweerdt@fastly.com>
Signed-off-by: Jim Warner <james.warner@comcast.net>

This patch has been modified to fit euler os
Signed-off-by: chenmingmin <chenmingmin@huawei.com>
---
 top/top.c | 2 ++
 1 files changed, 2 insertions(+)

diff --git a/top/top.c b/top/top.c
index e06a61f..1147938 100644
--- a/top/top.c
+++ b/top/top.c
@@ -6486,6 +6486,8 @@ static int window_show (WIN_t *q, int wmax) {
 
    // Display Column Headings -- and distract 'em while we sort (maybe)
    PUFF("\n%s%s%s", q->capclr_hdr, q->columnhdr, Caps_endline);
+   // and just in case 'Monpids' is active but matched no processes ...
+   if (!Frame_maxtask) return 1;                    // 1 for the column header
 
    if (CHKw(q, Show_FOREST))
       forest_create(q);
-- 
2.22.0.windows.1