From bee0ac28c9c8027540ae56900b9f85e0bd555f1d Mon Sep 17 00:00:00 2001
From: Ben Kibbey <bjk@luxsci.net>
Date: Mon, 9 Apr 2012 20:52:22 -0400
Subject: Fix killing PID -1.

When the KILLSCD command had been sent a race condition would occur
causing PID -1 getting killed, which on Linux seems to terminate all
applications for the current user.
---
 scd/apdu.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/scd/apdu.c b/scd/apdu.c
index 064f0d636..8467b034c 100644
--- a/scd/apdu.c
+++ b/scd/apdu.c
@@ -1016,7 +1016,8 @@ pcsc_get_status_wrapped (int slot, unsigned int *status)
   close (slotp->pcsc.rsp_fd);
   slotp->pcsc.req_fd = -1;
   slotp->pcsc.rsp_fd = -1;
-  kill (slotp->pcsc.pid, SIGTERM);
+  if (slotp->pcsc.pid != -1)
+    kill (slotp->pcsc.pid, SIGTERM);
   slotp->pcsc.pid = (pid_t)(-1);
   slotp->used = 0;
   return sw;
@@ -1180,7 +1181,8 @@ pcsc_send_apdu_wrapped (int slot, unsigned char *apdu, size_t apdulen,
   close (slotp->pcsc.rsp_fd);
   slotp->pcsc.req_fd = -1;
   slotp->pcsc.rsp_fd = -1;
-  kill (slotp->pcsc.pid, SIGTERM);
+  if (slotp->pcsc.pid != -1)
+    kill (slotp->pcsc.pid, SIGTERM);
   slotp->pcsc.pid = (pid_t)(-1);
   slotp->used = 0;
   return sw;
@@ -1321,7 +1323,8 @@ control_pcsc_wrapped (int slot, unsigned long ioctl_code,
   close (slotp->pcsc.rsp_fd);
   slotp->pcsc.req_fd = -1;
   slotp->pcsc.rsp_fd = -1;
-  kill (slotp->pcsc.pid, SIGTERM);
+  if (slotp->pcsc.pid != -1)
+    kill (slotp->pcsc.pid, SIGTERM);
   slotp->pcsc.pid = (pid_t)(-1);
   slotp->used = 0;
   return pcsc_error_to_sw (err);
@@ -1422,7 +1425,8 @@ close_pcsc_reader_wrapped (int slot)
   close (slotp->pcsc.rsp_fd);
   slotp->pcsc.req_fd = -1;
   slotp->pcsc.rsp_fd = -1;
-  kill (slotp->pcsc.pid, SIGTERM);
+  if (slotp->pcsc.pid != -1)
+    kill (slotp->pcsc.pid, SIGTERM);
   slotp->pcsc.pid = (pid_t)(-1);
   slotp->used = 0;
   return 0;
@@ -1640,7 +1644,8 @@ reset_pcsc_reader_wrapped (int slot)
   close (slotp->pcsc.rsp_fd);
   slotp->pcsc.req_fd = -1;
   slotp->pcsc.rsp_fd = -1;
-  kill (slotp->pcsc.pid, SIGTERM);
+  if (slotp->pcsc.pid != -1)
+    kill (slotp->pcsc.pid, SIGTERM);
   slotp->pcsc.pid = (pid_t)(-1);
   slotp->used = 0;
   return sw;
@@ -1965,7 +1970,8 @@ open_pcsc_reader_wrapped (const char *portstr)
   close (slotp->pcsc.rsp_fd);
   slotp->pcsc.req_fd = -1;
   slotp->pcsc.rsp_fd = -1;
-  kill (slotp->pcsc.pid, SIGTERM);
+  if (slotp->pcsc.pid != -1)
+    kill (slotp->pcsc.pid, SIGTERM);
   slotp->pcsc.pid = (pid_t)(-1);
   slotp->used = 0;
   /* There is no way to return SW. */
-- 
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