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plugins/libplugin-pay: Add a check for NaN values #8357

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Due to the imprecision of htlc_max's type (fp16_t), capacity_bias() can return NaN in some cases. This leads to the following runtime error when compiled with UBSan:

runtime error: nan is outside the range of representable values of type 'unsigned long'

Add a check against it.

Checklist

Before submitting the PR, ensure the following tasks are completed. If an item is not applicable to your PR, please mark it as checked:

  • The changelog has been updated in the relevant commit(s) according to the guidelines.
  • Tests have been added or modified to reflect the changes.
  • Documentation has been reviewed and updated as needed.
  • Related issues have been listed and linked, including any that this PR closes.

CC: @morehouse

Chandra Pratap added 2 commits June 17, 2025 07:04
Add a test in `plugins/test/run-route-calc.c` that reproduces the
runtime error when the fix is not applied.
Changelog-Fixed: Due to the imprecision of `htlc_max`'s type (`fp16_t`),
`capacity_bias()` can return `NaN` in some cases. This leads to a
runtime error when compiled with UBSan. Add a check against it.
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