From f3ab576e6a5f34dfedde93fe236d1eac577628d0 Mon Sep 17 00:00:00 2001
From: simon <simon@cda61777-01e9-0310-a592-d414129be87e>
Date: Tue, 31 Jul 2001 14:23:21 +0000
Subject: [PATCH] Yet another possible segfault path in the backends fixed. I
 don't _believe_ I'm still finding these. I have no idea what I was thinking
 when I wrote this stuff.

git-svn-id: svn://svn.tartarus.org/sgt/putty@1162 cda61777-01e9-0310-a592-d414129be87e
---
 raw.c    | 6 ++++--
 rlogin.c | 6 ++++--
 ssh.c    | 6 ++++--
 telnet.c | 6 ++++--
 4 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/raw.c b/raw.c
index f5b93f79..86fd5315 100644
--- a/raw.c
+++ b/raw.c
@@ -23,8 +23,10 @@ static void c_write(char *buf, int len)
 static int raw_closing(Plug plug, char *error_msg, int error_code,
 		       int calling_back)
 {
-    sk_close(s);
-    s = NULL;
+    if (s) {
+        sk_close(s);
+        s = NULL;
+    }
     if (error_msg) {
 	/* A socket error has occurred. */
 	connection_fatal(error_msg);
diff --git a/rlogin.c b/rlogin.c
index 3ae18089..80108527 100644
--- a/rlogin.c
+++ b/rlogin.c
@@ -24,8 +24,10 @@ static void c_write(char *buf, int len)
 static int rlogin_closing(Plug plug, char *error_msg, int error_code,
 			  int calling_back)
 {
-    sk_close(s);
-    s = NULL;
+    if (s) {
+        sk_close(s);
+        s = NULL;
+    }
     if (error_msg) {
 	/* A socket error has occurred. */
 	connection_fatal(error_msg);
diff --git a/ssh.c b/ssh.c
index 45354884..e2c2d737 100644
--- a/ssh.c
+++ b/ssh.c
@@ -1478,8 +1478,10 @@ static int ssh_closing(Plug plug, char *error_msg, int error_code,
 		       int calling_back)
 {
     ssh_state = SSH_STATE_CLOSED;
-    sk_close(s);
-    s = NULL;
+    if (s) {
+        sk_close(s);
+        s = NULL;
+    }
     if (error_msg) {
 	/* A socket error has occurred. */
 	connection_fatal(error_msg);
diff --git a/telnet.c b/telnet.c
index b00a6da0..04cbec02 100644
--- a/telnet.c
+++ b/telnet.c
@@ -565,8 +565,10 @@ static void do_telnet_read(char *buf, int len)
 static int telnet_closing(Plug plug, char *error_msg, int error_code,
 			  int calling_back)
 {
-    sk_close(s);
-    s = NULL;
+    if (s) {
+        sk_close(s);
+        s = NULL;
+    }
     if (error_msg) {
 	/* A socket error has occurred. */
 	connection_fatal(error_msg);
-- 
2.11.0