From c5d73e37bbc0c9fa8fd1dd874ac782b655068576 Mon Sep 17 00:00:00 2001
From: James R <justsomejames2@gmail.com>
Date: Tue, 19 Nov 2019 11:16:17 -0800
Subject: [PATCH] Fix strcasestr SIGSEGV in the case of only upper case strchr
 returning NULL

---
 src/strcasestr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/strcasestr.c b/src/strcasestr.c
index 2077dc3ff..86c7ec5b0 100644
--- a/src/strcasestr.c
+++ b/src/strcasestr.c
@@ -75,7 +75,7 @@ strcasestr (const char *s, const char *q)
 	if (!( (intptr_t)up|(intptr_t)lp ))
 		return 0;
 
-	if (!lp || up < lp)
+	if (!lp || ( up && up < lp ))
 	{
 		ppa = &up;
 		ppb = &lp;