[PATCH net] rxrpc: fix some null-ptr-deref bugs in server_key.c

[David Howells]

Paolo Abeni <pabeni at redhat.com> wrote:

> It looks like we can add a couple of fixes tag to help stable teams:
> 
> Fixes: d5953f6543b5 ("rxrpc: Allow security classes to give more info on server keys")

Not this one.  This includes a check for the one op it adds:

	+       if (sec && sec->describe_server_key)
	+               sec->describe_server_key(key, m);


> Fixes: 12da59fcab5a ("xrpc: Hand server key parsing off to the security class")

There's a missing 'r' in "rxrpc:" in the patch subject, but otherwise this one
looks like the right one.

Thanks,
David