Avoid NRE when disposing.

drieseng · drieseng · commit 76fdef9d72b8 · 2016-09-11T20:20:55.000+02:00
diff --git a/src/Renci.SshNet/Sftp/SftpSession.cs b/src/Renci.SshNet/Sftp/SftpSession.cs
@@ -315,10 +315,11 @@ protected override void Dispose(bool disposing)
 
             if (disposing)
             {
-                if (_sftpVersionConfirmed != null)
+                var sftpVersionConfirmed = _sftpVersionConfirmed;
+                if (sftpVersionConfirmed != null)
                 {
-                    _sftpVersionConfirmed.Dispose();
                     _sftpVersionConfirmed = null;
+                    sftpVersionConfirmed.Dispose();
                 }
             }
         }

Original file line number	Diff line number	Diff line change
`@@ -315,10 +315,11 @@ protected override void Dispose(bool disposing)`
`315`	`315`
`316`	`316`	`if (disposing)`
`317`	`317`	`{`
`318`		`- if (_sftpVersionConfirmed != null)`
	`318`	`+ var sftpVersionConfirmed = _sftpVersionConfirmed;`
	`319`	`+ if (sftpVersionConfirmed != null)`
`319`	`320`	`{`
`320`		`- _sftpVersionConfirmed.Dispose();`
`321`	`321`	`_sftpVersionConfirmed = null;`
	`322`	`+ sftpVersionConfirmed.Dispose();`
`322`	`323`	`}`
`323`	`324`	`}`
`324`	`325`	`}`