* Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> [230921 14:25]: > On Thu, 21 Sep 2023 14:12:34 -0400 "Liam R. Howlett" <Liam.Howlett@xxxxxxxxxx> wrote: > > > Pedro Falcato contacted me on IRC with an mprotect regression which was > > bisected back to the iterator changes for maple tree. Root cause > > analysis showed the mas_prev() running off the end of the VMA space > > (previous from 0) followed by mas_find(), would skip the first value. > > > > This patch set introduces maple state underflow/overflow so the sequence > > of calls on the maple state will return what the user expects. > > It isn't clear what are the user-visible effects of this flaw? Please > send this along and I'll paste it in. User may notice that mas_prev() or mas_next() calls that result in going outside of the limit passed to the call will cause incorrect returns on subsequent calls using that maple state, such as mas_find() skipping an entry. > > Patch 1 should be titled "Add mas_is_active ...". Oh yes, sorry. > > And patch 1 should have had cc:stable in the changelog. Ah, I sent the series to stable but didn't add that to the changelog. I'll do that in v2 as it seems I need to update patch 2 anyways. > > It's stable@xxxxxxxxxxxxxxx, although stable@xxxxxxxxxx works just fine.
