scsi: libsas: Stop hardcoding SAS address length

mainline inclusion
from mainline-5.2-rc1
commit 7b27c5fe
category: bugfix
bugzilla: 16634
CVE: NA
---------------------------

Many times we use 8 for SAS address length, while we already have a macro
for this - SAS_ADDR_SIZE.

Replace instances of this with the macro. However, don't touch the SAS
address array sizes sas.h, as these are defined according to the SAS spec.

Some missing whitespaces are also added, and whitespace indentation
in sas_hash_addr() is also fixed (see sas_hash_addr()).
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: NYufen Yu <yuyufen@huawei.com>
Reviewed-by: NJason Yan <yanaijie@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

drivers/scsi/libsas/sas_expander.c

@@ -1138,7 +1138,7 @@ static int sas_find_sub_addr(struct domain_device *dev, u8 *sub_addr)
 		     phy->attached_dev_type == SAS_FANOUT_EXPANDER_DEVICE) &&
 		    phy->routing_attr == SUBTRACTIVE_ROUTING) {
 
-			memcpy(sub_addr, phy->attached_sas_addr,SAS_ADDR_SIZE);
+			memcpy(sub_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 
 			return 1;
 		}
@@ -1150,7 +1150,7 @@ static int sas_check_level_subtractive_boundary(struct domain_device *dev)
 {
 	struct expander_device *ex = &dev->ex_dev;
 	struct domain_device *child;
-	u8 sub_addr[8] = {0, };
+	u8 sub_addr[SAS_ADDR_SIZE] = {0, };
 
 	list_for_each_entry(child, &ex->children, siblings) {
 		if (child->dev_type != SAS_EDGE_EXPANDER_DEVICE &&
@@ -1160,7 +1160,7 @@ static int sas_check_level_subtractive_boundary(struct domain_device *dev)
 			sas_find_sub_addr(child, sub_addr);
 			continue;
 		} else {
-			u8 s2[8];
+			u8 s2[SAS_ADDR_SIZE];
 
 			if (sas_find_sub_addr(child, s2) &&
 			    (SAS_ADDR(sub_addr) != SAS_ADDR(s2))) {
@@ -1757,10 +1757,11 @@ static int sas_get_phy_attached_dev(struct domain_device *dev, int phy_id,
 
 	res = sas_get_phy_discover(dev, phy_id, disc_resp);
 	if (res == 0) {
-		memcpy(sas_addr, disc_resp->disc.attached_sas_addr, 8);
+		memcpy(sas_addr, disc_resp->disc.attached_sas_addr,
+		       SAS_ADDR_SIZE);
 		*type = to_dev_type(dr);
 		if (*type == 0)
-			memset(sas_addr, 0, 8);
+			memset(sas_addr, 0, SAS_ADDR_SIZE);
 	}
 	kfree(disc_resp);
 	return res;
@@ -2026,10 +2027,10 @@ static int sas_rediscover_dev(struct domain_device *dev, int phy_id, bool last)
 	struct expander_device *ex = &dev->ex_dev;
 	struct ex_phy *phy = &ex->ex_phy[phy_id];
 	enum sas_device_type type = SAS_PHY_UNUSED;
-	u8 sas_addr[8];
+	u8 sas_addr[SAS_ADDR_SIZE];
 	int res;
 
-	memset(sas_addr, 0, 8);
+	memset(sas_addr, 0, SAS_ADDR_SIZE);
 	res = sas_get_phy_attached_dev(dev, phy_id, sas_addr, &type);
 	switch (res) {
 	case SMP_RESP_NO_PHY:

drivers/scsi/libsas/sas_init.c

@@ -87,25 +87,27 @@ EXPORT_SYMBOL_GPL(sas_free_task);
 /*------------ SAS addr hash -----------*/
 void sas_hash_addr(u8 *hashed, const u8 *sas_addr)
 {
-        const u32 poly = 0x00DB2777;
-        u32     r = 0;
-        int     i;
-
-        for (i = 0; i < 8; i++) {
-                int b;
-                for (b = 7; b >= 0; b--) {
-                        r <<= 1;
-                        if ((1 << b) & sas_addr[i]) {
-                                if (!(r & 0x01000000))
-                                        r ^= poly;
-                        } else if (r & 0x01000000)
-                                r ^= poly;
-                }
-        }
-
-        hashed[0] = (r >> 16) & 0xFF;
-        hashed[1] = (r >> 8) & 0xFF ;
-        hashed[2] = r & 0xFF;
+	const u32 poly = 0x00DB2777;
+	u32 r = 0;
+	int i;
+
+	for (i = 0; i < SAS_ADDR_SIZE; i++) {
+		int b;
+
+		for (b = (SAS_ADDR_SIZE - 1); b >= 0; b--) {
+			r <<= 1;
+			if ((1 << b) & sas_addr[i]) {
+				if (!(r & 0x01000000))
+					r ^= poly;
+			} else if (r & 0x01000000) {
+				r ^= poly;
+			}
+		}
+	}
+
+	hashed[0] = (r >> 16) & 0xFF;
+	hashed[1] = (r >> 8) & 0xFF;
+	hashed[2] = r & 0xFF;
 }
 
 int sas_register_ha(struct sas_ha_struct *sas_ha)

include/scsi/libsas.h

@@ -246,9 +246,9 @@ static inline struct sas_discovery_event *to_sas_discovery_event(struct work_str
 struct sas_discovery {
 	struct sas_discovery_event disc_work[DISC_NUM_EVENTS];
 	unsigned long    pending;
-	u8     fanout_sas_addr[8];
-	u8     eeds_a[8];
-	u8     eeds_b[8];
+	u8     fanout_sas_addr[SAS_ADDR_SIZE];
+	u8     eeds_a[SAS_ADDR_SIZE];
+	u8     eeds_b[SAS_ADDR_SIZE];
 	int    max_level;
 };