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60 lines
2.3 KiB
Diff
60 lines
2.3 KiB
Diff
From b22f5126a24b3b2f15448c3f2a254fc10cbc2b92 Mon Sep 17 00:00:00 2001
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From: Daniel Borkmann <dborkman@redhat.com>
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Date: Mon, 6 Jan 2014 00:57:54 +0100
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Subject: [PATCH] netfilter: nf_conntrack_dccp: fix skb_header_pointer API
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usages
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Some occurences in the netfilter tree use skb_header_pointer() in
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the following way ...
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struct dccp_hdr _dh, *dh;
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...
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skb_header_pointer(skb, dataoff, sizeof(_dh), &dh);
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... where dh itself is a pointer that is being passed as the copy
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buffer. Instead, we need to use &_dh as the forth argument so that
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we're copying the data into an actual buffer that sits on the stack.
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Currently, we probably could overwrite memory on the stack (e.g.
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with a possibly mal-formed DCCP packet), but unintentionally, as
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we only want the buffer to be placed into _dh variable.
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Fixes: 2bc780499aa3 ("[NETFILTER]: nf_conntrack: add DCCP protocol support")
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Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
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Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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---
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net/netfilter/nf_conntrack_proto_dccp.c | 6 +++---
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1 file changed, 3 insertions(+), 3 deletions(-)
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diff --git a/net/netfilter/nf_conntrack_proto_dccp.c b/net/netfilter/nf_conntrack_proto_dccp.c
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index 38412684a8824..cb372f96f10dc 100644
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--- a/net/netfilter/nf_conntrack_proto_dccp.c
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+++ b/net/netfilter/nf_conntrack_proto_dccp.c
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@@ -428,7 +428,7 @@ static bool dccp_new(struct nf_conn *ct, const struct sk_buff *skb,
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const char *msg;
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u_int8_t state;
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- dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &dh);
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+ dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &_dh);
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BUG_ON(dh == NULL);
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state = dccp_state_table[CT_DCCP_ROLE_CLIENT][dh->dccph_type][CT_DCCP_NONE];
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@@ -486,7 +486,7 @@ static int dccp_packet(struct nf_conn *ct, const struct sk_buff *skb,
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u_int8_t type, old_state, new_state;
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enum ct_dccp_roles role;
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- dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &dh);
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+ dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &_dh);
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BUG_ON(dh == NULL);
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type = dh->dccph_type;
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@@ -577,7 +577,7 @@ static int dccp_error(struct net *net, struct nf_conn *tmpl,
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unsigned int cscov;
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const char *msg;
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- dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &dh);
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+ dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &_dh);
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if (dh == NULL) {
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msg = "nf_ct_dccp: short packet ";
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goto out_invalid;
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