selinux/stable-5.3 PR 20190726

-----BEGIN PGP SIGNATURE-----
 
 iQJIBAABCAAyFiEES0KozwfymdVUl37v6iDy2pc3iXMFAl07eQIUHHBhdWxAcGF1
 bC1tb29yZS5jb20ACgkQ6iDy2pc3iXORlg/9GoL9NMb5A6SMkkd+FrMM3Gn4A8iC
 15jn2AXBL8WMY64EB8DofPPhBrdss5EFVLNSeZTvpOVko3aITemsFdrytKNHqY9v
 FbtKAfNOuJI7DWak1yMeuKrgSurxd/ZFfze3qUxlwDzO6recf9RbNQkZ60n/LIr2
 vSnJDWqlDOQiUN5+qNzTL6ztpXAhmoT2D0Nx6GjZd/XBuvcY5Xf4gX+/UhlGpL3O
 e8bJO3b8kQbyBb3aaak/YYsesfzsPxzy5eGZdKFWmNnbsRL6L6Y4vDHP3xxNPsSd
 s0rhibAYNYzeM0MJNj5TD0KDl/vxildaLKPtmRo+vvLGtZeyKxPgyrmnA7AlBa7K
 6yQ9X4nM5VS/Gs68gzLzpz9IzViJBuX18+oMbCdUDM5Xfu+9/zpKBFW06OMEdxcr
 MIbXpCD02Zq6KrduAWP4WSdni2oTTXzOjY9YbyDjhKvo/xF9vloY8XJ9JfyQXqJi
 6uNG1rGhPgF9cQKHX6M84lp0PXdwLB1sUo0BqJvU39+tOqmBxfvOJmghDSuqbJPa
 BKuWNnsPhiRqRN6LIw/yCTxxlF2+cg0fywFl1981PIxUDnfTTYuNL+Rb+cyzo3L2
 QLABdl2sLTfl7GOXOKcBQEE6yHs11m6eYLOKhvdDNhFVy5EmOFF4IUFO69I6YNok
 R3IUowNF8JLYByE=
 =Bojy
 -----END PGP SIGNATURE-----

Merge tag 'selinux-pr-20190726' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux

Pull selinux fix from Paul Moore:
 "One small SELinux patch to add some proper bounds/overflow checking
  when adding a new sid/secid"

* tag 'selinux-pr-20190726' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux:
  selinux: check sidtab limit before adding a new entry

security/selinux/ss/sidtab.c

@@ -286,6 +286,11 @@ static int sidtab_reverse_lookup(struct sidtab *s, struct context *context,
 		++count;
 	}
 
+	/* bail out if we already reached max entries */
+	rc = -EOVERFLOW;
+	if (count >= SIDTAB_MAX)
+		goto out_unlock;
+
 	/* insert context into new entry */
 	rc = -ENOMEM;
 	dst = sidtab_do_lookup(s, count, 1);