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-rw-r--r--nix/libstore/build.cc3
1 files changed, 2 insertions, 1 deletions
diff --git a/nix/libstore/build.cc b/nix/libstore/build.cc
index 5697ae5a43..f6431bb726 100644
--- a/nix/libstore/build.cc
+++ b/nix/libstore/build.cc
@@ -3102,7 +3102,8 @@ void SubstitutionGoal::finished()
throw Error(format("unknown hash algorithm in `%1%'") % hashStr);
case htSHA256:
hash.first = parseHash16or32(hashType, string(hashStr, n + 1));
- hash.second = std::atoi(statusList[2].c_str());
+ if (!string2Int(statusList[2], hash.second))
+ throw Error(format("invalid nar size for '%1%' substitute") % storePath);
break;
default:
/* The database only stores SHA256 hashes, so compute it. */