[SCSI] iscsi_tcp: check for valid session before accessing

Check that the session is setup before accessing its
connection. This fixes a oops where userspace tries
to get the ip address before the session is bound to
a host.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index 12b351213c59079acca9733e5b3116867839b33c..bfb6d07d87f06c8c9d1632fe27ef6907b4c46af7 100644 (file)
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -759,6 +759,9 @@ static int iscsi_sw_tcp_host_get_param(struct Scsi_Host *shost,
 
        switch (param) {
        case ISCSI_HOST_PARAM_IPADDRESS:
+               if (!session)
+                       return -ENOTCONN;
+
                spin_lock_bh(&session->frwd_lock);
                conn = session->leadconn;
                if (!conn) {