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@kernel.org> Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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