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Provide better filter validation. PR 3366.

This commit is contained in:
phil 1997-07-07 18:18:28 +00:00
parent f9d2af5859
commit 511baacef4
1 changed files with 4 additions and 2 deletions
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6
sys/net/bpf_filter.c
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@ -1,4 +1,4 @@
/* $NetBSD: bpf_filter.c,v 1.12 1996/02/13 22:00:00 christos Exp $ */
/* $NetBSD: bpf_filter.c,v 1.13 1997/07/07 18:18:28 phil Exp $ */
/*
* Copyright (c) 1990, 1991, 1992, 1993
@ -499,7 +499,9 @@ bpf_validate(f, len)
register int from = i + 1;
if (BPF_OP(p->code) == BPF_JA) {
if (from + p->k >= len)
if ((p->k < 0) ||
(from + p->k >= len) ||
(from + p->k < 0))
return 0;
}
else if (from + p->jt >= len || from + p->jf >= len)