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netfilter: flowtable: fix NAT IPv6 offload mangling

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commit 0e07e25b481aa021e4b48085ecb8a049e9614510 upstream.

Fix out-of-bound access in the address array.

Fixes: 5c27d8d76c ("netfilter: nf_flow_table_offload: add IPv6 support")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pablo Neira Ayuso 2021-03-30 16:24:11 +02:00 committed by Greg Kroah-Hartman
parent be07581aac
commit 394c81e36e
1 changed files with 3 additions and 3 deletions
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6
net/netfilter/nf_flow_table_offload.c
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@ -305,12 +305,12 @@ static void flow_offload_ipv6_mangle(struct nf_flow_rule *flow_rule,
const __be32 *addr, const __be32 *mask)
{
struct flow_action_entry *entry;
int i;
int i, j;
for (i = 0; i < sizeof(struct in6_addr) / sizeof(u32); i += sizeof(u32)) {
for (i = 0, j = 0; i < sizeof(struct in6_addr) / sizeof(u32); i += sizeof(u32), j++) {
entry = flow_action_entry_next(flow_rule);
flow_offload_mangle(entry, FLOW_ACT_MANGLE_HDR_TYPE_IP6,
offset + i, &addr[i], mask);
offset + i, &addr[j], mask);
}
}