netdev - [PATCH net] flow_dissector: fix false-positive __read_overflow2

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Message-Id: <20220406211521.723357-1-kuba@kernel.org>
Date:   Wed,  6 Apr 2022 14:15:21 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     davem@...emloft.net
Cc:     pabeni@...hat.com, netdev@...r.kernel.org, gustavoars@...nel.org,
        kurt@...utronix.de, keescook@...omium.org,
        Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH net] flow_dissector: fix false-positive __read_overflow2_field() warning

Bounds checking is unhappy that we try to copy both Ethernet
addresses but pass pointer to the first one. Luckily destination
address is the first field so pass the pointer to the entire header,
whatever.

Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
I feel like we talked about this one.
I wonder if my position now is consistent with what I said
in the past :)

 net/core/flow_dissector.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 03b6e649c428..912bda212db2 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -1032,7 +1032,7 @@ bool __skb_flow_dissect(const struct net *net,
 		key_eth_addrs = skb_flow_dissector_target(flow_dissector,
 							  FLOW_DISSECTOR_KEY_ETH_ADDRS,
 							  target_container);
-		memcpy(key_eth_addrs, &eth->h_dest, sizeof(*key_eth_addrs));
+		memcpy(key_eth_addrs, eth, sizeof(*key_eth_addrs));
 	}
 
 proto_again:
-- 
2.34.1