target: Fix 16-bit target ports for SET TARGET PORT GROUPS emulation

The old code did (MSB << 8) & 0xff, which always evaluates to 0.  Just use
get_unaligned_be16() so we don't have to worry about whether our open-coded
version is correct or not.

Signed-off-by: Roland Dreier <roland@purestorage.com>
Cc: stable@vger.kernel.org
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

1 files changed, 3 insertions, 4 deletions

diff --git a/drivers/target/target_core_alua.c b/drivers/target/target_core_alua.c
index 01a2691dfb47..c7746a3339d4 100644
--- a/drivers/target/target_core_alua.c
+++ b/drivers/target/target_core_alua.c
@@ -30,6 +30,7 @@
 #include <linux/export.h>
 #include <scsi/scsi.h>
 #include <scsi/scsi_cmnd.h>
+#include <asm/unaligned.h>
 
 #include <target/target_core_base.h>
 #include <target/target_core_backend.h>
@@ -267,8 +268,7 @@ int target_emulate_set_target_port_groups(struct se_task *task)
                  * changed.
                  */
                 if (primary) {
-                        tg_pt_id = ((ptr[2] << 8) & 0xff);
-                        tg_pt_id |= (ptr[3] & 0xff);
+                        tg_pt_id = get_unaligned_be16(ptr + 2);
                         /*
                          * Locate the matching target port group ID from
                          * the global tg_pt_gp list
@@ -312,8 +312,7 @@ int target_emulate_set_target_port_groups(struct se_task *task)
                          * the Target Port in question for the the incoming
                          * SET_TARGET_PORT_GROUPS op.
                          */
-                        rtpi = ((ptr[2] << 8) & 0xff);
-                        rtpi |= (ptr[3] & 0xff);
+                        rtpi = get_unaligned_be16(ptr + 2);
                         /*
                          * Locate the matching relative target port identifer
                          * for the struct se_device storage object.