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libexpr: fix stack overflow in toJSON on deeply nested structures

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Similar to the deepSeq fix, toJSON on deeply nested structures caused
an uncontrolled OS-level stack overflow.

Fix by adding call depth tracking to printValueAsJSON.
This commit is contained in:
Robert Hensing 2025-11-22 00:09:45 +01:00
parent a812b6c6e6
commit c7e1c612eb
5 changed files with 109 additions and 0 deletions
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2
src/libexpr/value-to-json.cc
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@ -16,6 +16,8 @@ json printValueAsJSON(
{
checkInterrupt();
auto _level = state.addCallDepth(pos);
if (strict)
state.forceValue(v, pos);