Fix heap corruption after apache reloads (appsec)

[cataphract]

Description

Reviewer checklist

• [ ] Test coverage seems ok.
• [ ] Appropriate labels assigned.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 72.38%. Comparing base (1b40137) to head (adf82ce). Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
appsec/src/extension/ddtrace.c	0.00%	0 Missing and 1 partial :warning:

Additional details and impacted files

[](https://app.codecov.io/gh/DataDog/dd-trace-php/pull/2928?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog) ```diff @@ Coverage Diff @@ ## master #2928 +/- ## ============================================ - Coverage 72.39% 72.38% -0.01% Complexity 2526 2526 ============================================ Files 135 135 Lines 14400 14400 Branches 989 989 ============================================ - Hits 10425 10424 -1 Misses 3433 3433 - Partials 542 543 +1 ``` | [Flag](https://app.codecov.io/gh/DataDog/dd-trace-php/pull/2928/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog) | Coverage Δ | | |---|---|---| | [appsec-extension](https://app.codecov.io/gh/DataDog/dd-trace-php/pull/2928/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog) | `68.34% <0.00%> (-0.03%)` | :arrow_down: | | [tracer-php](https://app.codecov.io/gh/DataDog/dd-trace-php/pull/2928/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog) | `73.96% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog#carryforward-flags-in-the-pull-request-comment) to find out more. | [Files with missing lines](https://app.codecov.io/gh/DataDog/dd-trace-php/pull/2928?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog) | Coverage Δ | | |---|---|---| | [appsec/src/extension/ddtrace.c](https://app.codecov.io/gh/DataDog/dd-trace-php/pull/2928?src=pr&el=tree&filepath=appsec%2Fsrc%2Fextension%2Fddtrace.c&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog#diff-YXBwc2VjL3NyYy9leHRlbnNpb24vZGR0cmFjZS5j) | `59.55% <0.00%> (-0.45%)` | :arrow_down: | ------ [Continue to review full report in Codecov by Sentry](https://app.codecov.io/gh/DataDog/dd-trace-php/pull/2928?dropdown=coverage&src=pr&el=continue&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog). > **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog) > `Δ = absolute (impact)`, `ø = not affected`, `? = missing data` > Powered by [Codecov](https://app.codecov.io/gh/DataDog/dd-trace-php/pull/2928?dropdown=coverage&src=pr&el=footer&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog). Last update [1b40137...adf82ce](https://app.codecov.io/gh/DataDog/dd-trace-php/pull/2928?dropdown=coverage&src=pr&el=lastupdated&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog).