iser-target: Ignore non TEXT + LOGOUT opcodes for discovery

This patch adds a check in isert_rx_opcode() to ignore non TEXT + LOGOUT
opcodes when SessionType=Discovery has been negotiated.

Cc: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/infiniband/ulp/isert/ib_isert.c b/drivers/infiniband/ulp/isert/ib_isert.c
index f02bfcc282e5..ecd16541896b 100644
--- a/drivers/infiniband/ulp/isert/ib_isert.c
+++ b/drivers/infiniband/ulp/isert/ib_isert.c
@@ -1066,11 +1066,19 @@ isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
 {
         struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
         struct iscsi_conn *conn = isert_conn->conn;
+        struct iscsi_session *sess = conn->sess;
         struct iscsi_cmd *cmd;
         struct isert_cmd *isert_cmd;
         int ret = -EINVAL;
         u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
 
+        if (sess->sess_ops->SessionType &&
+           (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
+                pr_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
+                       " ignoring\n", opcode);
+                return 0;
+        }
+
         switch (opcode) {
         case ISCSI_OP_SCSI_CMD:
                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);