ath: Modify ath_key_delete() to not need full key entry

ath: Modify ath_key_delete() to not need full key entry

Origin: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit?id=609c0cfd07f0ae6c444e064a59b46c5f3090b705
Bug-Debian-Security: https://security-tracker.debian.org/tracker/CVE-2020-3702

commit 144cd24dbc36650a51f7fe3bf1424a1432f1f480 upstream.

tkip_keymap can be used internally to avoid the reference to key->cipher
and with this, only the key index value itself is needed. This allows
ath_key_delete() call to be postponed to be handled after the upper
layer STA and key entry have already been removed. This is needed to
make ath9k key cache management safer.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20201214172118.18100-5-jouni@codeaurora.org
Cc: Pali Rohár <pali@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Gbp-Pq: Topic bugfix
Gbp-Pq: Name ath-Modify-ath_key_delete-to-not-need-full-key-entry.patch