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fix(cache): data race when updating the TTL of cached messages #7397

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Merged
yongtang merged 1 commit into from
Jul 3, 2025
Merged

fix(cache): data race when updating the TTL of cached messages #7397

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6 changes: 3 additions & 3 deletions plugin/cache/dnssec.go
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Original file line number Diff line number Diff line change
Expand Up @@ -3,21 +3,21 @@ package cache
import "github.com/miekg/dns"

// filterRRSlice filters out OPT RRs, and sets all RR TTLs to ttl.
// If dup is true the RRs in rrs are _copied_ into the slice that is
// returned.
// If dup is true the RRs in rrs are _copied_ before adjusting their
// TTL and the slice of copied RRs is returned.
func filterRRSlice(rrs []dns.RR, ttl uint32, dup bool) []dns.RR {
j := 0
rs := make([]dns.RR, len(rrs))
for _, r := range rrs {
if r.Header().Rrtype == dns.TypeOPT {
continue
}
r.Header().Ttl = ttl
if dup {
rs[j] = dns.Copy(r)
} else {
rs[j] = r
}
rs[j].Header().Ttl = ttl
j++
}
return rs[:j]
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