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| author | Pablo Neira Ayuso <pablo@netfilter.org> | 2023-01-11 17:07:33 +0100 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2023-01-11 19:18:04 +0100 |
| commit | 696e1a48b1a1b01edad542a1ef293665864a4dd0 (patch) | |
| tree | 6c6cd112a0f4e9b772306843c67443020f492fd8 /tools | |
| parent | 9ea4b476cea1b7d461d16dda25ca3c7e616e2d15 (diff) | |
| download | linux-696e1a48b1a1b01edad542a1ef293665864a4dd0.tar.bz2 | |
netfilter: nft_payload: incorrect arithmetics when fetching VLAN header bits
If the offset + length goes over the ethernet + vlan header, then the
length is adjusted to copy the bytes that are within the boundaries of
the vlan_ethhdr scratchpad area. The remaining bytes beyond ethernet +
vlan header are copied directly from the skbuff data area.
Fix incorrect arithmetic operator: subtract, not add, the size of the
vlan header in case of double-tagged packets to adjust the length
accordingly to address CVE-2023-0179.
Reported-by: Davide Ornaghi <d.ornaghi97@gmail.com>
Fixes: f6ae9f120dad ("netfilter: nft_payload: add C-VLAN support")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'tools')
0 files changed, 0 insertions, 0 deletions