[Rpm-maint] [rpm-software-management/rpm] Reset recursion depth for error message (PR #3209)

[Florian Festi]

$ rpm --define 'aaa %[%aaa]' --eval '%aaa'

let to a core dump due to a stack overflow. This was cause by the generation of the error message failing due to being too deep in the recursion of the macro expansion - creating more error messages.

Resetting the depth counter allows rendering the error message. As we are failing and breaking off the parse run this is fine to do.

Thanks to Miro Hrončok for reporting

Resolves: #3197
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/3209

-- Commit Summary --

  * Reset recursion depth for error message

-- File Changes --

    M rpmio/macro.c (4)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/3209.patch
https://github.com/rpm-software-management/rpm/pull/3209.diff

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