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| author | Daniel Borkmann <dborkman@redhat.com> | 2014-01-06 00:57:54 +0100 |
|---|---|---|
| committer | Brett Rogers <brettrogers11@gmail.com> | 2016-02-20 14:06:27 -0800 |
| commit | 7263d7854a4418052aafc520e66313ffc8a2bedc (patch) | |
| tree | ebea6b840ef3b464363500ac0f152dc328b832aa /net/netfilter | |
| parent | 9c25bb369d3df8816610919ae76faaf5fb04c14a (diff) | |
| download | kernel_samsung_smdk4412-7263d7854a4418052aafc520e66313ffc8a2bedc.zip kernel_samsung_smdk4412-7263d7854a4418052aafc520e66313ffc8a2bedc.tar.gz kernel_samsung_smdk4412-7263d7854a4418052aafc520e66313ffc8a2bedc.tar.bz2 | |
netfilter: nf_conntrack_dccp: fix skb_header_pointer API usages
Some occurences in the netfilter tree use skb_header_pointer() in
the following way ...
struct dccp_hdr _dh, *dh;
...
skb_header_pointer(skb, dataoff, sizeof(_dh), &dh);
... where dh itself is a pointer that is being passed as the copy
buffer. Instead, we need to use &_dh as the forth argument so that
we're copying the data into an actual buffer that sits on the stack.
Currently, we probably could overwrite memory on the stack (e.g.
with a possibly mal-formed DCCP packet), but unintentionally, as
we only want the buffer to be placed into _dh variable.
Change-Id: I61e449445e085beec3697ec9ffbad0838fb6bff8
Fixes: 2bc780499aa3 ("[NETFILTER]: nf_conntrack: add DCCP protocol support")
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter')
| -rw-r--r-- | net/netfilter/nf_conntrack_proto_dccp.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/net/netfilter/nf_conntrack_proto_dccp.c b/net/netfilter/nf_conntrack_proto_dccp.c index 2e664a6..8aa94ee 100644 --- a/net/netfilter/nf_conntrack_proto_dccp.c +++ b/net/netfilter/nf_conntrack_proto_dccp.c @@ -431,7 +431,7 @@ static bool dccp_new(struct nf_conn *ct, const struct sk_buff *skb, const char *msg; u_int8_t state; - dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &dh); + dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &_dh); BUG_ON(dh == NULL); state = dccp_state_table[CT_DCCP_ROLE_CLIENT][dh->dccph_type][CT_DCCP_NONE]; @@ -483,7 +483,7 @@ static int dccp_packet(struct nf_conn *ct, const struct sk_buff *skb, u_int8_t type, old_state, new_state; enum ct_dccp_roles role; - dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &dh); + dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &_dh); BUG_ON(dh == NULL); type = dh->dccph_type; @@ -575,7 +575,7 @@ static int dccp_error(struct net *net, struct nf_conn *tmpl, unsigned int cscov; const char *msg; - dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &dh); + dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &_dh); if (dh == NULL) { msg = "nf_ct_dccp: short packet "; goto out_invalid; |