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libstore: Fix dangling pointers in DerivationGoal constructors

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This leads to a use-after free, because staticOutputHashes returns a temporary
object that dies before we can do a `return *mOutputHash`.

This is most likely the cause for random failures in Hydra [1].

[1]: https://hydra.nixos.org/build/305091330/nixlog/2
This commit is contained in:
Sergei Zimmerman 2025-08-15 16:39:28 +03:00
parent 4e776a5be8
commit cea85e79ee
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1 changed files with 3 additions and 4 deletions
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7
src/libstore/build/derivation-goal.cc
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@ -34,11 +34,10 @@ DerivationGoal::DerivationGoal(
, drvPath(drvPath) , drvPath(drvPath)
, wantedOutput(wantedOutput) , wantedOutput(wantedOutput)
, outputHash{[&] { , outputHash{[&] {
if (auto * mOutputHash = get(staticOutputHashes(worker.evalStore, drv), wantedOutput)) auto outputHashes = staticOutputHashes(worker.evalStore, drv);
if (auto * mOutputHash = get(outputHashes, wantedOutput))
return *mOutputHash; return *mOutputHash;
else throw Error("derivation '%s' does not have output '%s'", worker.store.printStorePath(drvPath), wantedOutput);
throw Error(
"derivation '%s' does not have output '%s'", worker.store.printStorePath(drvPath), wantedOutput);
}()} }()}
, buildMode(buildMode) , buildMode(buildMode)
{ {