From: Philip Homburg <philip@cs.vu.nl>
Date: Wed, 27 Jul 2005 12:01:11 +0000 (+0000)
Subject: Do not accept requests from dead processes.
X-Git-Tag: v3.1.0~517
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/Bv9ARM.ch05.html?a=commitdiff_plain;h=aa994b48ee0a6d86564a1bbad792ba4e1f840c51;p=minix.git

Do not accept requests from dead processes.
---

diff --git a/servers/fs/main.c b/servers/fs/main.c
index d3403a730..988a25a76 100644
--- a/servers/fs/main.c
+++ b/servers/fs/main.c
@@ -81,6 +81,9 @@ PUBLIC void main()
 		if (call_nr < 0 || call_nr >= NCALLS) { 
 			error = ENOSYS;
 			printf("FS, warning illegal %d system call by %d\n", call_nr, who);
+		} else if (fp->fp_pid == PID_FREE) {
+			error = ENOSYS;
+			printf("FS, bad process, who = %d\n", who);
 		} else {
 			error = (*call_vec[call_nr])();
 		}
diff --git a/servers/fs/misc.c b/servers/fs/misc.c
index b34027880..0167b2a89 100644
--- a/servers/fs/misc.c
+++ b/servers/fs/misc.c
@@ -350,9 +350,15 @@ PUBLIC int do_exit()
   /* If a session leader exits then revoke access to its controlling tty from
    * all other processes using it.
    */
-  if (!fp->fp_sesldr) return(OK);		/* not a session leader */
+  if (!fp->fp_sesldr) {
+	fp->fp_pid = PID_FREE;
+  	return(OK);		/* not a session leader */
+  }
   fp->fp_sesldr = FALSE;
-  if (fp->fp_tty == 0) return(OK);		/* no controlling tty */
+  if (fp->fp_tty == 0) {
+	fp->fp_pid = PID_FREE;
+  	return(OK);		/* no controlling tty */
+  }
   dev = fp->fp_tty;
 
   for (rfp = &fproc[0]; rfp < &fproc[NR_PROCS]; rfp++) {