target: Avoid non-existent tg_pt_gp_mem in target_alua_state_check

This patch adds an check for a non-existent port->sep_alua_tg_pt_gp_mem
within target_alua_state_check(), which is not present for internally
dispatched EXTENDED_COPY WRITE I/O to the destination target port.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Martin Petersen <martin.petersen@oracle.com>
Cc: Chris Mason <chris.mason@fusionio.com>
Cc: Roland Dreier <roland@purestorage.com>
Cc: Zach Brown <zab@redhat.com>
Cc: James Bottomley <JBottomley@Parallels.com>
Cc: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Nicholas Bellinger <nab@daterainc.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/target/target_core_alua.c b/drivers/target/target_core_alua.c
index 5403186e4777..ea928c4d8854 100644
--- a/drivers/target/target_core_alua.c
+++ b/drivers/target/target_core_alua.c
@@ -557,6 +557,9 @@ target_alua_state_check(struct se_cmd *cmd)
          * a ALUA logical unit group.
          */
         tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
+        if (!tg_pt_gp_mem)
+                return 0;
+
         spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
         tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
         out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);