[PATCH] KEYS: add missing permission check for request_key() destination

[David Howells]

Eric Biggers <ebiggers3 at gmail.com> wrote:

> +		if (do_perm_check) {
> +			ret = key_permission(make_key_ref(dest_keyring, 1),
> +					     KEY_NEED_WRITE);

dest_keyring may be NULL at this point as alloc_uid() doesn't automatically
create keyrings.

David
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