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libexpr: Make unsafeGetAttrPos not crash on noPos

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Currently e.g. `builtins.unsafeGetAttrPos "abort" builtins` will
eventually segfault because pos->file is an unset Symbol.

Found by afl-fuzz.
This commit is contained in:
Tuomas Tynkkynen 2018-04-03 15:27:17 +03:00
parent 3fbaa230a2
commit af86132e1a
3 changed files with 3 additions and 1 deletions
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tests/lang/eval-okay-getattrpos-undefined.exp Normal file
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tests/lang/eval-okay-getattrpos-undefined.nix Normal file
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builtins.unsafeGetAttrPos "abort" builtins