i2d_RSAPublicKey retval ignored in multiple callsites
Hello. Here follows a bug report by Guido Vranken received through the hackerone program.
There are various places in the codebase where we don't check the retval of i2d_RSA_PublicKey() (or its callers). That function can fail in cases of OOM, and this is something we should be handling correctly. This is a similar case to #17686 (moved).
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