From 8c292a2f9d20151d7269f8b95d5ddde226c8efb8 Mon Sep 17 00:00:00 2001
From: Alexey Zamorov <53096396+AlexeyZamorov@users.noreply.github.com>
Date: Sun, 15 Aug 2021 17:28:03 +0300
Subject: [PATCH] Avoid dangling pointer in curl header.str

If buf_len is zero, this would leave behind a dangling pointer
to an already released header.str. Make sure this can't happen
by always overwriting the pointer.

Closes GH-7376.
---
 ext/curl/interface.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/ext/curl/interface.c b/ext/curl/interface.c
index 6434638b69d..630cf86ce27 100644
--- a/ext/curl/interface.c
+++ b/ext/curl/interface.c
@@ -1766,9 +1766,7 @@ static int curl_debug(CURL *cp, curl_infotype type, char *buf, size_t buf_len, v
 		if (ch->header.str) {
 			zend_string_release_ex(ch->header.str, 0);
 		}
-		if (buf_len > 0) {
-			ch->header.str = zend_string_init(buf, buf_len, 0);
-		}
+		ch->header.str = zend_string_init(buf, buf_len, 0);
 	}
 
 	return 0;