ipv4: Check attribute length for RTA_FLOW in multipath route
commit 664b9c4b upstream. Make sure RTA_FLOW is at least 4B before using. Fixes: 4e902c57 ("[IPv4]: FIB configuration using struct fib_config") Signed-off-by: David Ahern <dsahern@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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125d91f0
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