[PATCH] scsi: lpfc: Use struct_group() to initialize struct lpfc_cgn_info

[Kees Cook <keescook@chromium.org>]

In preparation for FORTIFY_SOURCE performing compile-time and run-time
field bounds checking for memset(), avoid intentionally writing across
neighboring fields.

Add struct_group() to mark "stat" region of struct lpfc_cgn_info that
should be initialized to zero, and refactor the "data" region memset()
to wipe everything up to the cgn_stats region.

Signed-off-by: Kees Cook <keescook@chromium.org>
---
Also, ping, Re: https://lore.kernel.org/lkml/20211203223351.107323-1-keescook@chromium.org/
---
 drivers/scsi/lpfc/lpfc.h      | 90 +++++++++++++++++------------------
 drivers/scsi/lpfc/lpfc_init.c |  4 +-
 2 files changed, 46 insertions(+), 48 deletions(-)

diff --git a/drivers/scsi/lpfc/lpfc.h b/drivers/scsi/lpfc/lpfc.h
index 3faadcfcdcbb..4878c94761f9 100644
--- a/drivers/scsi/lpfc/lpfc.h
+++ b/drivers/scsi/lpfc/lpfc.h
@@ -496,52 +496,50 @@ struct lpfc_cgn_info {
 	__le32   cgn_alarm_hr[24];
 	__le32   cgn_alarm_day[LPFC_MAX_CGN_DAYS];
 
-	/* Start of congestion statistics */
-	uint8_t  cgn_stat_npm;		/* Notifications per minute */
-
-	/* Start Time */
-	uint8_t  cgn_stat_month;
-	uint8_t  cgn_stat_day;
-	uint8_t  cgn_stat_year;
-	uint8_t  cgn_stat_hour;
-	uint8_t  cgn_stat_minute;
-	uint8_t  cgn_pad2[2];
-
-	__le32   cgn_notification;
-	__le32   cgn_peer_notification;
-	__le32   link_integ_notification;
-	__le32   delivery_notification;
-
-	uint8_t  cgn_stat_cgn_month; /* Last congestion notification FPIN */
-	uint8_t  cgn_stat_cgn_day;
-	uint8_t  cgn_stat_cgn_year;
-	uint8_t  cgn_stat_cgn_hour;
-	uint8_t  cgn_stat_cgn_min;
-	uint8_t  cgn_stat_cgn_sec;
-
-	uint8_t  cgn_stat_peer_month; /* Last peer congestion FPIN */
-	uint8_t  cgn_stat_peer_day;
-	uint8_t  cgn_stat_peer_year;
-	uint8_t  cgn_stat_peer_hour;
-	uint8_t  cgn_stat_peer_min;
-	uint8_t  cgn_stat_peer_sec;
-
-	uint8_t  cgn_stat_lnk_month; /* Last link integrity FPIN */
-	uint8_t  cgn_stat_lnk_day;
-	uint8_t  cgn_stat_lnk_year;
-	uint8_t  cgn_stat_lnk_hour;
-	uint8_t  cgn_stat_lnk_min;
-	uint8_t  cgn_stat_lnk_sec;
-
-	uint8_t  cgn_stat_del_month; /* Last delivery notification FPIN */
-	uint8_t  cgn_stat_del_day;
-	uint8_t  cgn_stat_del_year;
-	uint8_t  cgn_stat_del_hour;
-	uint8_t  cgn_stat_del_min;
-	uint8_t  cgn_stat_del_sec;
-#define LPFC_CGN_STAT_SIZE	48
-#define LPFC_CGN_DATA_SIZE	(sizeof(struct lpfc_cgn_info) -  \
-				LPFC_CGN_STAT_SIZE - sizeof(uint32_t))
+	struct_group(cgn_stat,
+		uint8_t  cgn_stat_npm;		/* Notifications per minute */
+
+		/* Start Time */
+		uint8_t  cgn_stat_month;
+		uint8_t  cgn_stat_day;
+		uint8_t  cgn_stat_year;
+		uint8_t  cgn_stat_hour;
+		uint8_t  cgn_stat_minute;
+		uint8_t  cgn_pad2[2];
+
+		__le32   cgn_notification;
+		__le32   cgn_peer_notification;
+		__le32   link_integ_notification;
+		__le32   delivery_notification;
+
+		uint8_t  cgn_stat_cgn_month; /* Last congestion notification FPIN */
+		uint8_t  cgn_stat_cgn_day;
+		uint8_t  cgn_stat_cgn_year;
+		uint8_t  cgn_stat_cgn_hour;
+		uint8_t  cgn_stat_cgn_min;
+		uint8_t  cgn_stat_cgn_sec;
+
+		uint8_t  cgn_stat_peer_month; /* Last peer congestion FPIN */
+		uint8_t  cgn_stat_peer_day;
+		uint8_t  cgn_stat_peer_year;
+		uint8_t  cgn_stat_peer_hour;
+		uint8_t  cgn_stat_peer_min;
+		uint8_t  cgn_stat_peer_sec;
+
+		uint8_t  cgn_stat_lnk_month; /* Last link integrity FPIN */
+		uint8_t  cgn_stat_lnk_day;
+		uint8_t  cgn_stat_lnk_year;
+		uint8_t  cgn_stat_lnk_hour;
+		uint8_t  cgn_stat_lnk_min;
+		uint8_t  cgn_stat_lnk_sec;
+
+		uint8_t  cgn_stat_del_month; /* Last delivery notification FPIN */
+		uint8_t  cgn_stat_del_day;
+		uint8_t  cgn_stat_del_year;
+		uint8_t  cgn_stat_del_hour;
+		uint8_t  cgn_stat_del_min;
+		uint8_t  cgn_stat_del_sec;
+	);
 
 	__le32   cgn_info_crc;
 #define LPFC_CGN_CRC32_MAGIC_NUMBER	0x1EDC6F41
diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
index 2fe7d9d885d9..c18000d05379 100644
--- a/drivers/scsi/lpfc/lpfc_init.c
+++ b/drivers/scsi/lpfc/lpfc_init.c
@@ -13483,7 +13483,7 @@ lpfc_init_congestion_buf(struct lpfc_hba *phba)
 	phba->cgn_evt_minute = 0;
 	phba->hba_flag &= ~HBA_CGN_DAY_WRAP;
 
-	memset(cp, 0xff, LPFC_CGN_DATA_SIZE);
+	memset(cp, 0xff, offsetof(struct lpfc_cgn_info, cgn_stat));
 	cp->cgn_info_size = cpu_to_le16(LPFC_CGN_INFO_SZ);
 	cp->cgn_info_version = LPFC_CGN_INFO_V3;
 
@@ -13542,7 +13542,7 @@ lpfc_init_congestion_stat(struct lpfc_hba *phba)
 		return;
 
 	cp = (struct lpfc_cgn_info *)phba->cgn_i->virt;
-	memset(&cp->cgn_stat_npm, 0, LPFC_CGN_STAT_SIZE);
+	memset(&cp->cgn_stat, 0, sizeof(cp->cgn_stat));
 
 	ktime_get_real_ts64(&cmpl_time);
 	time64_to_tm(cmpl_time.tv_sec, 0, &broken);
-- 
2.30.2