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If a server sent multiple NPN extensions in a single ClientHello then a mem leak can occur. This will only happen where the client has requested NPN in the first place. It does not occur during renegotiation. Therefore the maximum that could be leaked in a single connection with a malicious server is 64k (the maximum size of the ServerHello extensions section). As this is client side, only occurs if NPN has been requested and does not occur during renegotiation this is unlikely to be exploitable. Issue reported by Shi Lei. Reviewed-by: Rich Salz <rsalz@openssl.org>
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