From: Daniel Stenberg <daniel@haxx.se>
Date: Wed, 24 Apr 2024 06:07:34 +0000 (+0200)
Subject: telnet: check return code from fileno()
X-Git-Tag: curl-8_8_0~163
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=a090111613c52066f786adbc05cc7ce9cc3cf3a3;p=thirdparty%2Fcurl.git

telnet: check return code from fileno()

and return error if necessary

Spotted by CodeSonar

Closes #13457
---

diff --git a/lib/telnet.c b/lib/telnet.c
index b129ff5202..7c28504494 100644
--- a/lib/telnet.c
+++ b/lib/telnet.c
@@ -1535,6 +1535,11 @@ static CURLcode telnet_do(struct Curl_easy *data, bool *done)
     pfd[1].events = POLLIN;
     poll_cnt = 2;
     interval_ms = 1 * 1000;
+    if(pfd[1].fd < 0) {
+      failf(data, "cannot read input");
+      result = CURLE_RECV_ERROR;
+      keepon = FALSE;
+    }
   }
 
   while(keepon) {