[PATCH 5.10 058/103] netfilter: flowtable: fix NAT IPv6 offload mangling

[Greg Kroah-Hartman]

From: Pablo Neira Ayuso <pa...@netfilter.org>

commit 0e07e25b481aa021e4b48085ecb8a049e9614510 upstream.

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

Fixes: 5c27d8d76ce8 ("netfilter: nf_flow_table_offload: add IPv6 support")
Signed-off-by: Pablo Neira Ayuso <pa...@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 net/netfilter/nf_flow_table_offload.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/net/netfilter/nf_flow_table_offload.c
+++ b/net/netfilter/nf_flow_table_offload.c
@@ -305,12 +305,12 @@ static void flow_offload_ipv6_mangle(str
                                     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);
        }
 }