Re: [PATCH net] tls: don't use stack memory in a scatterlist

[Matt Mullins]

On Thu, 2018-05-17 at 14:50 -0400, David Miller wrote:
> I'm surprised this problem wasn't discovered sooner.  How exactly did you
> discover it?  Did you actually see it trigger or is this purely from code
> inspection?

Honestly, I'm not sure how it got uncovered, but it was observed at
runtime.  Doron Roberts-Kedes hit a null pointer dereference so we
turned on CONFIG_DEBUG_SG -- then it became a proper
BUG_ON(!virt_addr_valid(buf)); in sg_set_buf.