scsi: target: spc: Fix RSOC parameter data header size

The SPC document states that "The COMMAND DATA LENGTH field indicates the
length in bytes of the command descriptor list".

The length should be subtracted by 4 to represent the length of the
description list, not 3.

Signed-off-by: Chaohai Chen <wdhh66@163.com>
Link: https://lore.kernel.org/r/20250115070739.216154-1-wdhh66@163.com
Reviewed-by: Dmitry Bogdanov <d.bogdanov@yadro.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/target/target_core_spc.c b/drivers/target/target_core_spc.c
index ea14a38356814d3afd0c942c17e1be1ff615d186..61c065702350e056baf4b1009fd51643d9397e40 100644 (file)
--- a/drivers/target/target_core_spc.c
+++ b/drivers/target/target_core_spc.c
@@ -2243,7 +2243,7 @@ spc_emulate_report_supp_op_codes(struct se_cmd *cmd)
                        response_length += spc_rsoc_encode_command_descriptor(
                                        &buf[response_length], rctd, descr);
                }
-               put_unaligned_be32(response_length - 3, buf);
+               put_unaligned_be32(response_length - 4, buf);
        } else {
                response_length = spc_rsoc_encode_one_command_descriptor(
                                &buf[response_length], rctd, descr,