From ce90f916fee2a39eb914f8b6b349adb76d100f75 Mon Sep 17 00:00:00 2001
From: Sebastien GODARD <sysstat@users.noreply.github.com>
Date: Sat, 13 Apr 2019 18:44:29 +0200
Subject: [PATCH] sadf: Fix seg fault on empty data files

Trying to display XML or JSON data (with sadf -x/-j) from a data file
containing only RESTART records created a core dump.
This patch fixes that.

Signed-off-by: Sebastien GODARD <sysstat@users.noreply.github.com>
---
 sadf.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/sadf.c b/sadf.c
index 2d2c39c..5d558d3 100644
--- a/sadf.c
+++ b/sadf.c
@@ -963,14 +963,15 @@ void logic1_display_loop(int ifd, struct file_activity *file_actlst, char *file,
 			(tm_start.use && (datecmp(loctime, &tm_start) < 0)) ||
 			(tm_end.use && (datecmp(loctime, &tm_end) >= 0))));
 
-		/* Save the first stats collected. Used for example in next_slice() function */
-		copy_structures(act, id_seq, record_hdr, 2, 0);
-
 		curr = 1;
 		cnt = count;
 		reset = TRUE;
 
 		if (!eosaf) {
+
+		        /* Save the first stats collected. Used for example in next_slice() function */
+		        copy_structures(act, id_seq, record_hdr, 2, 0);
+
 			do {
 				eosaf = read_next_sample(ifd, IGNORE_COMMENT | IGNORE_RESTART, curr,
 							 file, &rtype, tab, file_magic, file_actlst,
-- 
2.31.1