flow_dissector: Fix out-of-bounds warning in __skb_flow_bpf_to_target()

Fix the following out-of-bounds warning:

net/core/flow_dissector.c:835:3: warning: 'memcpy' offset [33, 48] from the object at 'flow_keys' is out of the bounds of referenced subobject 'ipv6_src' with type '__u32[4]' {aka 'unsigned int[4]'} at offset 16 [-Warray-bounds]

The problem is that the original code is trying to copy data into a
couple of struct members adjacent to each other in a single call to
memcpy().  So, the compiler legitimately complains about it. As these
are just a couple of members, fix this by copying each one of them in
separate calls to memcpy().

This helps with the ongoing efforts to globally enable -Warray-bounds
and get us closer to being able to tighten the FORTIFY_SOURCE routines
on memcpy().

Link: https://github.com/KSPP/linux/issues/109
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 5985029..3ed7c98 100644 (file)
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -832,8 +832,10 @@ static void __skb_flow_bpf_to_target(const struct bpf_flow_keys *flow_keys,
                key_addrs = skb_flow_dissector_target(flow_dissector,
                                                      FLOW_DISSECTOR_KEY_IPV6_ADDRS,
                                                      target_container);
-               memcpy(&key_addrs->v6addrs, &flow_keys->ipv6_src,
-                      sizeof(key_addrs->v6addrs));
+               memcpy(&key_addrs->v6addrs.src, &flow_keys->ipv6_src,
+                      sizeof(key_addrs->v6addrs.src));
+               memcpy(&key_addrs->v6addrs.dst, &flow_keys->ipv6_dst,
+                      sizeof(key_addrs->v6addrs.dst));
                key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
        }