diff --git a/drivers/scsi/libsrp.c b/drivers/scsi/libsrp.c
index f79602f..2277516 100644
--- a/drivers/scsi/libsrp.c
+++ b/drivers/scsi/libsrp.c
@@ -328,7 +328,7 @@
 	int offset, err = 0;
 	u8 format;
 
-	offset = cmd->add_cdb_len * 4;
+	offset = cmd->add_cdb_len & ~3;
 
 	dir = srp_cmd_direction(cmd);
 	if (dir == DMA_FROM_DEVICE)
@@ -366,7 +366,7 @@
 {
 	struct srp_direct_buf *md;
 	struct srp_indirect_buf *id;
-	int len = 0, offset = cmd->add_cdb_len * 4;
+	int len = 0, offset = cmd->add_cdb_len & ~3;
 	u8 fmt;
 
 	if (dir == DMA_TO_DEVICE)