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From a1a4730c1f02cd85680cf7608ac81e0db59ee522 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Petr=20Men=C5=A1=C3=ADk?= <pemensik@redhat.com>
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Date: Wed, 16 Jan 2019 16:27:33 +0100
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Subject: [PATCH] Fix possible crash when loading corrupted file
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Some values passes internal triggers by coincidence. Fix the check and
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check also first_node_offset before even passing it further.
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---
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lib/dns/rbt.c | 6 ++++--
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1 file changed, 4 insertions(+), 2 deletions(-)
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diff --git a/lib/dns/rbt.c b/lib/dns/rbt.c
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index ef6441b..404fd6d 100644
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--- a/lib/dns/rbt.c
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+++ b/lib/dns/rbt.c
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@@ -754,7 +754,7 @@ treefix(dns_rbt_t *rbt, void *base, size_t filesize, dns_rbtnode_t *n,
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}
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CONFIRM((void *)n >= base);
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- CONFIRM((char *)n - (char *)base <= (int)nodemax);
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+ CONFIRM((size_t)((char *)n - (char *)base) <= (int)nodemax);
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CONFIRM(DNS_RBTNODE_VALID(n));
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dns_name_init(&nodename, NULL);
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@@ -911,7 +911,9 @@ dns_rbt_deserialize_tree(void *base_address, size_t filesize,
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rbt->root = (dns_rbtnode_t *)((char *)base_address + header_offset +
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header->first_node_offset);
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- if ((header->nodecount * sizeof(dns_rbtnode_t)) > filesize) {
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+ if ((header->nodecount * sizeof(dns_rbtnode_t)) > filesize
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+ || header->first_node_offset > filesize) {
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+
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result = ISC_R_INVALIDFILE;
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goto cleanup;
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}
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--
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2.21.1
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