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ipv6: Check attribute length for RTA_GATEWAY in multipath route
commit 4619bcf upstream. Commit referenced in the Fixes tag used nla_memcpy for RTA_GATEWAY as does the current nla_get_in6_addr. nla_memcpy protects against accessing memory greater than what is in the attribute, but there is no check requiring the attribute to have an IPv6 address. Add it. Fixes: 51ebd31 ("ipv6: add support of equal cost multipath (ECMP)") Signed-off-by: David Ahern <dsahern@kernel.org> Cc: Nicolas Dichtel <nicolas.dichtel@6wind.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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