[CIFS] Check return code on failed alloc

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

fs/cifs/README

@@ -458,6 +458,12 @@ A partial list of the supported mount options follows:
 		byte range locks).
  remount        remount the share (often used to change from ro to rw mounts
 	        or vice versa)
+ servern        Specify the server 's netbios name (RFC1001 name) to use
+		when attempting to setup a session to the server.  This is
+		This is needed for mounting to some older servers (such
+		as OS/2 or Windows 98 and Windows ME) since they do not
+		support a default server name.  A server name can be up
+		to 15 characters long and is usually uppercased.
  sfu            When the CIFS Unix Extensions are not negotiated, attempt to
 		create device files and fifos in a format compatible with
 		Services for Unix (SFU).  In addition retrieve bits 10-12

fs/cifs/sess.c

@@ -372,6 +372,10 @@ CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses, int first_time,
 
 	/* 2000 big enough to fit max user, domain, NOS name etc. */
 	str_area = kmalloc(2000, GFP_KERNEL);
+	if (str_area == NULL) {
+		cifs_small_buf_release(smb_buf);
+		return -ENOMEM;
+	}
 	bcc_ptr = str_area;
 
 	ses->flags &= ~CIFS_SES_LANMAN;