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wgengine/magicsock: validate endpoint.derpAddr in Conn.onUDPRelayAllocResp (#17828)

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Otherwise a zero value will panic in Conn.sendUDPStd.

Updates #17827

Signed-off-by: Jordan Whited <jordan@tailscale.com>
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Jordan Whited 2025-11-10 20:07:33 -08:00 committed by GitHub
parent 4650061326
commit 18806de400
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1 changed files with 3 additions and 1 deletions
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wgengine/magicsock/magicsock.go
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@ -651,8 +651,10 @@ func (c *Conn) onUDPRelayAllocResp(allocResp UDPRelayAllocResp) {
ep.mu.Lock() ep.mu.Lock()
defer ep.mu.Unlock() defer ep.mu.Unlock()
derpAddr := ep.derpAddr derpAddr := ep.derpAddr
if derpAddr.IsValid() {
go c.sendDiscoMessage(epAddr{ap: derpAddr}, ep.publicKey, disco.key, allocResp.Message, discoVerboseLog) go c.sendDiscoMessage(epAddr{ap: derpAddr}, ep.publicKey, disco.key, allocResp.Message, discoVerboseLog)
} }
}
// Synchronize waits for all [eventbus] events published // Synchronize waits for all [eventbus] events published
// prior to this call to be processed by the receiver. // prior to this call to be processed by the receiver.