[Tarantool-patches] [PATCH luajit] Avoid out-of-range number of results when compiling select(k, ...).

[Igor Munkin]

Sergey,

I've checked the patchset into all long-term branches in
tarantool/luajit and bumped a new version in master, release/3.0 and
release/2.11.

On 07.02.24, Sergey Kaplun via Tarantool-patches wrote:
> From: Mike Pall <mike>
> 
> The interpreter will throw and abort the trace, anyway.
> 
> (cherry picked from commit 6ca580155b035fd369f193cdee59391b594a5028)
> 
> The `recff_select()` sets the amount of `RecordFFData` structure even
> for a negative first argument when trace is not recording (since the
> interpreter will throw an error anyway). This leads to excess IR
> emission and possible reads of dirty memory.
> 
> This patch updates the `rd->nres` only in the case when a trace will be
> recorded.
> 
> Sergey Kaplun:
> * added the description and the test for the problem
> 
> Part of tarantool/tarantool#9595
> ---
> 
> Branch: https://github.com/tarantool/luajit/tree/skaplun/fix-ff-select-recording
> Tarantool PR: https://github.com/tarantool/tarantool/pull/9659
> Related issue: https://github.com/tarantool/tarantool/issues/9595
> 
>  src/lj_ffrecord.c                             |  2 +-
>  .../fix-ff-select-recording.test.lua          | 44 +++++++++++++++++++
>  2 files changed, 45 insertions(+), 1 deletion(-)
>  create mode 100644 test/tarantool-tests/fix-ff-select-recording.test.lua
> 

<snipped>

> -- 
> 2.43.0
> 

-- 
Best regards,
IM