in_opentelemetry: handle NULL body in otlp_pack_any_value (fix #10674)

[edsiper]

Fix issue #10674

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Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.

Summary by CodeRabbit

• Bug Fixes
  • Improved stability by handling cases where log record bodies may be missing, preventing potential errors or crashes.

[coderabbitai]

Walkthrough

Null pointer checks were added in two functions within the OpenTelemetry logs plugin. The otlp_pack_any_value function now handles a NULL body parameter by packing a nil value and returning early. Similarly, binary_payload_to_msgpack checks for a non-NULL body before accessing its fields, preventing potential null dereferences.

Changes

Cohort / File(s)	Change Summary
Null pointer handling in log record processing plugins/in_opentelemetry/opentelemetry_logs.c	Added explicit null pointer checks for the body parameter in two functions to prevent dereferencing null pointers and ensure safe handling of log records.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~6 minutes

Poem

A bunny hopped through logs one day,
Guarding pointers on the way.
If body is missing, don’t despair—
Pack a nil, show you care!
Now logs are safe, no crashes loom,
Thanks to checks that banish doom.
🐇✨

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📒 Files selected for processing (1)

• plugins/in_opentelemetry/opentelemetry_logs.c (2 hunks)

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🔇 Additional comments (2)

plugins/in_opentelemetry/opentelemetry_logs.c (2)

145-148: Excellent NULL pointer safety fix!

The addition of the NULL check prevents potential segmentation faults and handles the edge case gracefully by packing a nil value. This defensive programming approach aligns with the PR objective to fix issue #10674.

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545-545: Good complementary NULL check!

This additional NULL check prevents dereferencing body when accessing value_case, completing the defensive programming approach started in otlp_pack_any_value. The condition placement is logical and maintains the existing control flow.

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