scsi: qedi: Fix endpoint NULL panic in qedi_set_path.

RIP: 0010:qedi_set_path+0x114/0x570 [qedi]
 Call Trace:
  [<ffffffffa0472923>] iscsi_if_recv_msg+0x623/0x14a0
  [<ffffffff81307de6>] ? rhashtable_lookup_compare+0x36/0x70
  [<ffffffffa047382e>] iscsi_if_rx+0x8e/0x1f0
  [<ffffffff8155983d>] netlink_unicast+0xed/0x1b0
  [<ffffffff81559c30>] netlink_sendmsg+0x330/0x770
  [<ffffffff81510d60>] sock_sendmsg+0xb0/0xf0
  [<ffffffff8101360b>] ? __switch_to+0x17b/0x4b0
  [<ffffffff8163a2c8>] ? __schedule+0x2d8/0x900
  [<ffffffff81511199>] ___sys_sendmsg+0x3a9/0x3c0
  [<ffffffff810e2298>] ? get_futex_key+0x1c8/0x2b0
  [<ffffffff810e25a0>] ? futex_wake+0x80/0x160

Signed-off-by: Manish Rangankar <manish.rangankar@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/qedi/qedi_iscsi.c b/drivers/scsi/qedi/qedi_iscsi.c
index 19177931b84c006694e36ac7edbf0c74e07f2c3d..87f0af358b33ae4563ba2ee83a1aaa4ce9ca7945 100644 (file)
--- a/drivers/scsi/qedi/qedi_iscsi.c
+++ b/drivers/scsi/qedi/qedi_iscsi.c
@@ -1224,8 +1224,12 @@ static int qedi_set_path(struct Scsi_Host *shost, struct iscsi_path *path_data)
 
        iscsi_cid = (u32)path_data->handle;
        qedi_ep = qedi->ep_tbl[iscsi_cid];
-       QEDI_INFO(&qedi->dbg_ctx, QEDI_LOG_CONN,
+       QEDI_INFO(&qedi->dbg_ctx, QEDI_LOG_INFO,
                  "iscsi_cid=0x%x, qedi_ep=%p\n", iscsi_cid, qedi_ep);
+       if (!qedi_ep) {
+               ret = -EINVAL;
+               goto set_path_exit;
+       }
 
        if (!is_valid_ether_addr(&path_data->mac_addr[0])) {
                QEDI_NOTICE(&qedi->dbg_ctx, "dst mac NOT VALID\n");