fix: add nil check in AddressesAsCIDRs to prevent SIGSEGV #11602
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When ExternalIP is empty in Kubernetes, a nil ip.Addr can end up in the Addresses slice of l3rrNodeInfo. The existing cleanup logic only removed emptyV4Addr and emptyV6Addr (zero-valued structs), but not nil interface values. This caused a panic (SIGSEGV) when AsCIDR() was called on a nil address at l3_route_resolver.go:166. This fix adds a nil check to the cleanup loop to filter out nil addresses before iterating and calling AsCIDR(). Fixes projectcalico#11384 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <[email protected]> Signed-off-by: majiayu000 <[email protected]>
marvin-tigera
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caseydavenport
approved these changes
Dec 31, 2025
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Fixes #11384
Summary
AddressesAsCIDRs()to prevent null pointer dereferenceip.Addrin the Addresses slice, causing SIGSEGV whenAsCIDR()is calledChanges
l3_route_resolver.gobefore callingAsCIDR()Test plan
GOOS=linux go build ./felix/calc/GOOS=linux go test -c ./felix/calc/gofmt