diff options
| author | Gustavo A. R. Silva | 2021-04-16 14:31:51 -0500 |
|---|---|---|
| committer | David S. Miller | 2021-04-16 17:02:27 -0700 |
| commit | 1e3d976dbb23b3fce544752b434bdc32ce64aabc (patch) | |
| tree | 7680806e0d28d7c5a8f5e4e7e27710019a182dc9 /net/core | |
| parent | 1c86514d7fda55c5311c6b75aacb8c41b2e83999 (diff) | |
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>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/flow_dissector.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c index 5985029e43d4..3ed7c98a98e1 100644 --- 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; } |