svn commit: r303216 - stable/11/sys/kern

[Konstantin Belousov]

Author: kib
Date: Sat Jul 23 08:23:57 2016
New Revision: 303216
URL: https://svnweb.freebsd.org/changeset/base/303216

Log:
  MFC r302936:
  Explicitely check for the valid range of file descriptor values.
  
  Approved by:	re (gjb)

Modified:
  stable/11/sys/kern/kern_event.c
Directory Properties:
  stable/11/   (props changed)

Modified: stable/11/sys/kern/kern_event.c
==============================================================================
--- stable/11/sys/kern/kern_event.c	Sat Jul 23 08:06:50 2016	(r303215)
+++ stable/11/sys/kern/kern_event.c	Sat Jul 23 08:23:57 2016	(r303216)
@@ -1183,8 +1183,11 @@ kqueue_register(struct kqueue *kq, struc
 findkn:
 	if (fops->f_isfd) {
 		KASSERT(td != NULL, ("td is NULL"));
-		error = fget(td, kev->ident,
-		    cap_rights_init(&rights, CAP_EVENT), &fp);
+		if (kev->ident > INT_MAX)
+			error = EBADF;
+		else
+			error = fget(td, kev->ident,
+			    cap_rights_init(&rights, CAP_EVENT), &fp);
 		if (error)
 			goto done;