scsi: qla2xxx: Introduce the dsd32 and dsd64 data structures

Introduce two structures for the (DMA address, length) combination instead
of using separate structure members for the DMA address and length. This
patch fixes several Coverity complaints about 'cur_dsd' being used to write
outside the bounds of structure members.

Cc: Himanshu Madhani <hmadhani@marvell.com>
Cc: Giridhar Malavali <gmalavali@marvell.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Acked-by: Himanshu Madhani <hmadhani@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 13 insertions, 45 deletions

diff --git a/drivers/scsi/qla2xxx/qla_def.h b/drivers/scsi/qla2xxx/qla_def.h
index 8acaeba98da1..502a4812bf51 100644
--- a/drivers/scsi/qla2xxx/qla_def.h
+++ b/drivers/scsi/qla2xxx/qla_def.h
@@ -35,6 +35,7 @@
 #include <scsi/scsi_bsg_fc.h>
 
 #include "qla_bsg.h"
+#include "qla_dsd.h"
 #include "qla_nx.h"
 #include "qla_nx2.h"
 #include "qla_nvme.h"
@@ -1754,12 +1755,10 @@ typedef struct {
 	uint16_t dseg_count;		/* Data segment count. */
 	uint8_t scsi_cdb[MAX_CMDSZ]; 	/* SCSI command words. */
 	uint32_t byte_count;		/* Total byte count. */
-	uint32_t dseg_0_address;	/* Data segment 0 address. */
-	uint32_t dseg_0_length;		/* Data segment 0 length. */
-	uint32_t dseg_1_address;	/* Data segment 1 address. */
-	uint32_t dseg_1_length;		/* Data segment 1 length. */
-	uint32_t dseg_2_address;	/* Data segment 2 address. */
-	uint32_t dseg_2_length;		/* Data segment 2 length. */
+	union {
+		struct dsd32 dsd32[3];
+		struct dsd64 dsd64[2];
+	};
 } cmd_entry_t;
 
 /*
@@ -1780,10 +1779,7 @@ typedef struct {
 	uint16_t dseg_count;		/* Data segment count. */
 	uint8_t scsi_cdb[MAX_CMDSZ];	/* SCSI command words. */
 	uint32_t byte_count;		/* Total byte count. */
-	uint32_t dseg_0_address[2];	/* Data segment 0 address. */
-	uint32_t dseg_0_length;		/* Data segment 0 length. */
-	uint32_t dseg_1_address[2];	/* Data segment 1 address. */
-	uint32_t dseg_1_length;		/* Data segment 1 length. */
+	struct dsd64 dsd[2];
 } cmd_a64_entry_t, request_t;
 
 /*
@@ -1796,20 +1792,7 @@ typedef struct {
 	uint8_t sys_define;		/* System defined. */
 	uint8_t entry_status;		/* Entry Status. */
 	uint32_t reserved;
-	uint32_t dseg_0_address;	/* Data segment 0 address. */
-	uint32_t dseg_0_length;		/* Data segment 0 length. */
-	uint32_t dseg_1_address;	/* Data segment 1 address. */
-	uint32_t dseg_1_length;		/* Data segment 1 length. */
-	uint32_t dseg_2_address;	/* Data segment 2 address. */
-	uint32_t dseg_2_length;		/* Data segment 2 length. */
-	uint32_t dseg_3_address;	/* Data segment 3 address. */
-	uint32_t dseg_3_length;		/* Data segment 3 length. */
-	uint32_t dseg_4_address;	/* Data segment 4 address. */
-	uint32_t dseg_4_length;		/* Data segment 4 length. */
-	uint32_t dseg_5_address;	/* Data segment 5 address. */
-	uint32_t dseg_5_length;		/* Data segment 5 length. */
-	uint32_t dseg_6_address;	/* Data segment 6 address. */
-	uint32_t dseg_6_length;		/* Data segment 6 length. */
+	struct dsd32 dsd[7];
 } cont_entry_t;
 
 /*
@@ -1821,16 +1804,7 @@ typedef struct {
 	uint8_t entry_count;		/* Entry count. */
 	uint8_t sys_define;		/* System defined. */
 	uint8_t entry_status;		/* Entry Status. */
-	uint32_t dseg_0_address[2];	/* Data segment 0 address. */
-	uint32_t dseg_0_length;		/* Data segment 0 length. */
-	uint32_t dseg_1_address[2];	/* Data segment 1 address. */
-	uint32_t dseg_1_length;		/* Data segment 1 length. */
-	uint32_t dseg_2_address	[2];	/* Data segment 2 address. */
-	uint32_t dseg_2_length;		/* Data segment 2 length. */
-	uint32_t dseg_3_address[2];	/* Data segment 3 address. */
-	uint32_t dseg_3_length;		/* Data segment 3 length. */
-	uint32_t dseg_4_address[2];	/* Data segment 4 address. */
-	uint32_t dseg_4_length;		/* Data segment 4 length. */
+	struct dsd64 dsd[5];
 } cont_a64_entry_t;
 
 #define PO_MODE_DIF_INSERT	0
@@ -1874,8 +1848,7 @@ struct crc_context {
 			uint16_t	reserved_2;
 			uint16_t	reserved_3;
 			uint32_t	reserved_4;
-			uint32_t	data_address[2];
-			uint32_t	data_length;
+			struct dsd64	data_dsd;
 			uint32_t	reserved_5[2];
 			uint32_t	reserved_6;
 		} nobundling;
@@ -1885,11 +1858,8 @@ struct crc_context {
 			uint16_t	reserved_1;
 			__le16	dseg_count;	/* Data segment count */
 			uint32_t	reserved_2;
-			uint32_t	data_address[2];
-			uint32_t	data_length;
-			uint32_t	dif_address[2];
-			uint32_t	dif_length;	/* Data segment 0
-							 * length */
+			struct dsd64	data_dsd;
+			struct dsd64	dif_dsd;
 		} bundling;
 	} u;
 
@@ -2088,10 +2058,8 @@ typedef struct {
 	uint32_t handle2;
 	uint32_t rsp_bytecount;
 	uint32_t req_bytecount;
-	uint32_t dseg_req_address[2];	/* Data segment 0 address. */
-	uint32_t dseg_req_length;	/* Data segment 0 length. */
-	uint32_t dseg_rsp_address[2];	/* Data segment 1 address. */
-	uint32_t dseg_rsp_length;	/* Data segment 1 length. */
+	struct dsd64 req_dsd;
+	struct dsd64 rsp_dsd;
 } ms_iocb_entry_t;