target: check DPO/FUA usage for COMPARE AND WRITE

COMPARE AND WRITE requests should fail if DPO or FUA is set, but the
device is not advertising support.

Signed-off-by: David Disseldorp <ddiss@suse.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c
index 4fc8343786f2b94302f9530f5f1514208e9d0fc7..0b4b2a67d9f9ed597479f1f2c0ea356126f55006 100644 (file)
--- a/drivers/target/target_core_sbc.c
+++ b/drivers/target/target_core_sbc.c
@@ -992,6 +992,9 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
                               " than 1\n", sectors);
                        return TCM_INVALID_CDB_FIELD;
                }
+               if (sbc_check_dpofua(dev, cmd, cdb))
+                       return TCM_INVALID_CDB_FIELD;
+
                /*
                 * Double size because we have two buffers, note that
                 * zero is not an error..