On Tue, 2018-09-18 at 19:10 -0700, Kees Cook wrote:

In the quest to remove all stack VLA usage from the kernel[1], this
replaces struct crypto_skcipher and SKCIPHER_REQUEST_ON_STACK() usage
with struct crypto_sync_skcipher and SYNC_SKCIPHER_REQUEST_ON_STACK(),
which uses a fixed stack size.

[1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com

I know this lib80211 stuff landed on my plate as the maintainer (and the
others are probably more or less copies thereof), but honestly I don't
even have a device I could test this on, and quite possibly never had
(after the old non-mac80211 b43 driver was killed.)

So basically I'll just trust you to be doing the right thing, since you
probably did the same transformation on other code that is better
tested...

johannes