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remotecache: avoid ultra deep recursion for complex cache layouts #6168

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remotecache: avoid ultra deep recursion for complex cache layouts #6168

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14 changes: 11 additions & 3 deletions cache/remotecache/v1/utils.go
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Original file line number Diff line number Diff line change
Expand Up @@ -134,13 +134,21 @@ func (s *normalizeState) removeLoops(ctx context.Context) {
}

visited := map[digest.Digest]struct{}{}
processed := map[digest.Digest]struct{}{}

for _, d := range roots {
s.checkLoops(ctx, d, visited)
s.checkLoops(ctx, d, visited, processed)
}
}

func (s *normalizeState) checkLoops(ctx context.Context, d digest.Digest, visited map[digest.Digest]struct{}) {
func (s *normalizeState) checkLoops(ctx context.Context, d digest.Digest, visited map[digest.Digest]struct{}, processed map[digest.Digest]struct{}) {
if _, ok := processed[d]; ok {
return
}
defer func() {
processed[d] = struct{}{}
}()

it, ok := s.byKey[d]
if !ok {
return
Expand All @@ -166,7 +174,7 @@ func (s *normalizeState) checkLoops(ctx context.Context, d digest.Digest, visite
}
delete(links[l], id)
} else {
s.checkLoops(ctx, id, visited)
s.checkLoops(ctx, id, visited, processed)
}
}
}
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