From 29618b7e27db22a0ee2a30435bc9fa9c3df6466f Mon Sep 17 00:00:00 2001
From: Romain Tartiere <romain.tartiere@gmail.com>
Date: Sat, 5 Mar 2011 21:27:10 +0000
Subject: [PATCH] Fix crash when pn53x_TgInitAsTarget() is aborted.

---
 libnfc/chips/pn53x.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libnfc/chips/pn53x.c b/libnfc/chips/pn53x.c
index 823c30a..918c052 100644
--- a/libnfc/chips/pn53x.c
+++ b/libnfc/chips/pn53x.c
@@ -1416,6 +1416,10 @@ pn53x_TgInitAsTarget (nfc_device_t * pnd, pn53x_target_mode_t ptm,
   if (!pn53x_transceive (pnd, abtCmd, 36 + szOptionalBytes, abtRx, &szRx))
     return false;
 
+  if (szRx == 0) {
+    return false; // transceive was aborted
+  }
+
   // Note: the first byte is skip: 
   //       its the "mode" byte which contains baudrate, DEP and Framing type (Mifare, active or FeliCa) datas.
   if(pbtModeByte) {