From 2c20d775162fc96bc71258a0eb0dda3c644de74f Mon Sep 17 00:00:00 2001
From: Marco d'Itri <md@linux.it>
Date: Tue, 18 Jun 2024 01:00:57 +0200
Subject: [PATCH] Always check the values returned by fdopen(3)

---
 whois.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/whois.c b/whois.c
index 1afe313..fe73f00 100644
--- a/whois.c
+++ b/whois.c
@@ -801,6 +801,8 @@ char *do_query(const int sock, const char *query)
     strcat(temp, "\r\n");
 
     fi = fdopen(sock, "r");
+    if (!fi)
+	err_sys("fdopen");
     if (write(sock, temp, strlen(temp)) < 0)
 	err_sys("write");
     free(temp);
@@ -875,6 +877,8 @@ char *query_crsnic(const int sock, const char *query)
     strcat(temp, "\r\n");
 
     fi = fdopen(sock, "r");
+    if (!fi)
+	err_sys("fdopen");
     if (write(sock, temp, strlen(temp)) < 0)
 	err_sys("write");
     free(temp);
@@ -928,6 +932,8 @@ char *query_afilias(const int sock, const char *query)
     strcat(temp, "\r\n");
 
     fi = fdopen(sock, "r");
+    if (!fi)
+	err_sys("fdopen");
     if (write(sock, temp, strlen(temp)) < 0)
 	err_sys("write");
     free(temp);
@@ -980,6 +986,8 @@ char *query_iana(const int sock, const char *query)
     strcat(temp, "\r\n");
 
     fi = fdopen(sock, "r");
+    if (!fi)
+	err_sys("fdopen");
     if (write(sock, temp, strlen(temp)) < 0)
 	err_sys("write");
     free(temp);