From: Seonah Moon <seonah1.moon@samsung.com>
Date: Wed, 27 May 2020 06:00:25 +0000 (+0900)
Subject: fix improper use of negative value
X-Git-Tag: submit/tizen/20200604.101817~1
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=34e25bffc554f491cd81e64d512acf85089976ca;p=platform%2Fupstream%2Flibwebsockets.git

fix improper use of negative value

https://github.com/warmcat/libwebsockets/commit/bce4d762e5a6b912f5993fcf3c8ccf94a08c88ca

Change-Id: I5eab3a8b58acb23c0339d33109a7614c93e8e93a
---

diff --git a/lib/tls/openssl/openssl-ssl.c b/lib/tls/openssl/openssl-ssl.c
index afe4f978..0ea77414 100644
--- a/lib/tls/openssl/openssl-ssl.c
+++ b/lib/tls/openssl/openssl-ssl.c
@@ -344,6 +344,7 @@ lws_ssl_info_callback(const SSL *ssl, int where, int ret)
 	struct lws *wsi;
 	struct lws_context *context;
 	struct lws_ssl_info si;
+	int fd;
 
 #ifndef USE_WOLFSSL
 	context = (struct lws_context *)SSL_CTX_get_ex_data(
@@ -356,7 +357,12 @@ lws_ssl_info_callback(const SSL *ssl, int where, int ret)
 #endif
 	if (!context)
 		return;
-	wsi = wsi_from_fd(context, SSL_get_fd(ssl));
+
+	fd = SSL_get_fd(ssl);
+	if (fd < 0 || (fd - lws_plat_socket_offset()) < 0)
+		return;
+
+	wsi = wsi_from_fd(context, fd);
 	if (!wsi)
 		return;