pppol2tp: Remove null pointer dereference.

Author: Julia Lawall <julia@diku.dk>

If session is NULL, it is not possible to access its name field.  So I
have split apart the printing of the error message to drop the
printing of the name field in this case.

The macro PRINTK actually only evaluates its arguments starting with
the third one if the bitwise conjunction of the first two is non-zero.
Normally, this conjunction would only be non-zero if debugging mode
were turned on, but when session is NULL, the first argument in both
the old and new code is -1, and thus the bitwise conjunction is true.
Perhaps a different strategy is desired, such as using tunnel->debug,
which session->debug is initialized to, but tunnel can also be NULL,
so this does not completely solve the problem.

This problem was found using the following semantic match

expression E, E1;
identifier f;
statement S1,S2,S3;

* if (E == NULL)
  ... when != if (E == NULL) S1 else S2
      when != E = E1
* E->f
  ... when any
  return ...;
else S3

Signed-off-by: Julia Lawall 
Signed-off-by: David S. Miller 
 drivers/net/pppol2tp.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/drivers/net/pppol2tp.c b/drivers/net/pppol2tp.c
index 244d783..79359919 100644
--- a/drivers/net/pppol2tp.c
+++ b/drivers/net/pppol2tp.c
@@ -1621,9 +1621,16 @@ out_no_ppp:
-	if (error != 0)
-		PRINTK(session ? session->debug : -1, PPPOL2TP_MSG_CONTROL, KERN_WARNING,
-		       "%s: connect failed: %d\n", session->name, error);
+	if (error != 0) {
+		if (session)
+			PRINTK(session->debug,
+				"%s: connect failed: %d\n",
+				session->name, error);
+		else
+				"connect failed: %d\n", error);
+	}
 	return error;