[SCSI] libfc: don't exch_done() on invalid sequence ptr

The lport_recv(), i.e., fc_lport_recv_req() may get called w/o the sequence ptr being set in fr_seq(), particularly in the case of vn2vn mode, this may happen if the passive fcp provider, e.g., tcm_fc, has not been registered yet. Signed-off-by: Yi Zou <[email protected]> Tested-by: Ross Brattain <[email protected]> Signed-off-by: Robert Love <[email protected]> Signed-off-by: James Bottomley <[email protected]>
jadonk · Jul 20, 2012 · db95fc0 · db95fc0
1 parent 95fdd5e
commit db95fc0
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/drivers/scsi/libfc/fc_lport.c b/drivers/scsi/libfc/fc_lport.c
@@ -980,7 +980,8 @@ static void fc_lport_recv_req(struct fc_lport *lport,
 	rcu_read_unlock();
 	FC_LPORT_DBG(lport, "dropping unexpected frame type %x\n", fh->fh_type);
 	fc_frame_free(fp);
-	lport->tt.exch_done(sp);
+	if (sp)
+		lport->tt.exch_done(sp);
 }
 
 /**