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source-accessor: fix case where normalization goes beyond root

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fixes https://github.com/NixOS/nix/issues/11936
This commit is contained in:
Jörg Thalheim 2024-11-24 11:17:17 +01:00
parent 3e9cc78eb5
commit 3fb7481e64
1 changed files with 4 additions and 3 deletions
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5
src/libutil/source-accessor.cc
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@ -84,9 +84,10 @@ CanonPath SourceAccessor::resolveSymlinks(
todo.pop_front(); todo.pop_front();
if (c == "" || c == ".") if (c == "" || c == ".")
; ;
else if (c == "..") else if (c == "..") {
if (!res.isRoot())
res.pop(); res.pop();
else { } else {
res.push(c); res.push(c);
if (mode == SymlinkResolution::Full || !todo.empty()) { if (mode == SymlinkResolution::Full || !todo.empty()) {
if (auto st = maybeLstat(res); st && st->type == SourceAccessor::tSymlink) { if (auto st = maybeLstat(res); st && st->type == SourceAccessor::tSymlink) {