xfrm6: Properly handle unsupported protocols
We don't catch the case if an unsupported protocol is submitted to the xfrm6 protocol handlers, this can lead to NULL pointer dereferences. Fix this by adding the appropriate checks. Fixes: 7e14ea15 ("xfrm6: Add IPsec protocol multiplexer") Signed-off-by: NSteffen Klassert <steffen.klassert@secunet.com>
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