From 9a0a10826bd811b181669ae9eb4544c5c4136bff Mon Sep 17 00:00:00 2001
From: Romuald Conty <romuald@libnfc.org>
Date: Tue, 28 Jan 2014 10:25:29 +0100
Subject: [PATCH] Fix pn53x_initiator_target_is_present() when saved target is
 NULL

This patch prevents from running any command to check target presence when none have been saved
---
 libnfc/chips/pn53x.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libnfc/chips/pn53x.c b/libnfc/chips/pn53x.c
index 690c0d1..56679ea 100644
--- a/libnfc/chips/pn53x.c
+++ b/libnfc/chips/pn53x.c
@@ -1728,6 +1728,11 @@ pn53x_initiator_deselect_target(struct nfc_device *pnd)
 int
 pn53x_initiator_target_is_present(struct nfc_device *pnd, const nfc_target *pnt)
 {
+  // Check if there is a saved target
+  if (CHIP_DATA(pnd)->current_target == NULL) {
+     return NFC_ETGRELEASED;
+  }
+
   // Check if the argument target nt is equals to current saved target
   if ((pnt != NULL) && (!pn53x_current_target_is(pnd, pnt))) {
     return NFC_ETGRELEASED;