Check iter index access slice bounds in Reverse

[kunga]

Changelog entry

...

Changelog category

• Not for changelog (changelog entry is not required)

Description for reviewers

The same as in #18151 but for reverse

Doesn't effect scans, but worth fixing

[github-actions]

🟢 2025-06-26 10:24:00 UTC The validation of the Pull Request description is successful.

[github-actions]

⚪ 2025-06-26 10:27:26 UTC Pre-commit check linux-x86_64-release-asan for 37dc31d has started.
⚪ 2025-06-26 10:27:48 UTC Artifacts will be uploaded here
⚪ 2025-06-26 10:31:51 UTC ya make is running...
🟡 2025-06-26 12:45:03 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
15823	15405	0	116	268	34

🟢 2025-06-26 12:46:27 UTC Build successful.
🟢 2025-06-26 12:46:55 UTC ydbd size 3.9 GiB changed* by +768 Bytes, which is < 100.0 KiB vs main: OK

ydbd size dash	main: 093001b	merge: 37dc31d	diff	diff %
ydbd size	4 192 778 160 Bytes	4 192 778 928 Bytes	+768 Bytes	+0.000%
ydbd stripped size	1 453 500 856 Bytes	1 453 500 856 Bytes	0 Bytes	0.000%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}

[github-actions]

⚪ 2025-06-26 10:32:53 UTC Pre-commit check linux-x86_64-relwithdebinfo for 37dc31d has started.
⚪ 2025-06-26 10:33:05 UTC Artifacts will be uploaded here
⚪ 2025-06-26 10:36:40 UTC ya make is running...
🟡 2025-06-26 12:20:08 UTC Some tests failed, follow the links below. Going to retry failed tests...

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
38099	35387	0	2	2670	40

⚪ 2025-06-26 12:23:26 UTC ya make is running... (failed tests rerun, try 2)
🟢 2025-06-26 12:35:18 UTC Tests successful.

Test history | Ya make output | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
537 (only retried tests)	501	0	0	8	28

🟢 2025-06-26 12:35:40 UTC Build successful.
🟢 2025-06-26 12:35:59 UTC ydbd size 2.2 GiB changed* by -240 Bytes, which is <= 0 Bytes vs main: OK

ydbd size dash	main: 093001b	merge: 37dc31d	diff	diff %
ydbd size	2 383 122 576 Bytes	2 383 122 336 Bytes	-240 Bytes	-0.000%
ydbd stripped size	498 976 712 Bytes	498 976 712 Bytes	0 Bytes	0.000%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}