I have an application which creates and destroys many SSL objects using
SSL_new and SSL_free. The SSL objects are bound to memory BIOs rather
than sockets. Here is a brief annotation of the relevent sections of code
(with error checks removed):
ks->ssl = SSL_new (ssl_ctx);
ks->ssl_bio = BIO_new (BIO_f_ssl());
ks->ciphertext_in = BIO_new (BIO_s_mem ());
ks->ciphertext_out = BIO_new (BIO_s_mem ());
if (server)
SSL_set_accept_state (ks->ssl);
else
SSL_set_connect_state (ks->ssl);
SSL_set_bio (ks->ssl, ks->ciphertext_in, ks->ciphertext_out);
BIO_set_ssl (ks->ssl_bio, ks->ssl, BIO_NOCLOSE);
/* DO SOMETHING */
SSL_free (ks->ssl);
The problem is that each of these iterations causes OpenSSL to leak 10K or
more. At first I thought that maybe the BIOs returned by BIO_new need to
be explicitly freed, but then I saw that OpenSSL is freeing them on the
SSL_free call.
98212 file=buffer.c, line=67, number=12, address=0815D738
71750 file=bio_ssl.c, line=108, number=24, address=081B3AB8
32120 file=buffer.c, line=110, number=1868, address=08199A50
72332 file=bio_lib.c, line=73, number=64, address=08170740
701884 bytes leaked in 1960 chunks
After many iterations, the amount of memory leaked is substantial. All of
the leaks are occurring at one of these 4 locations (above) in the code
(openssl-0.9.6c) which I obtained by building OpenSSL with CRYPTO_MDEBUG
defined.
Any ideas?
Thanks,
James Yonan
Boulder, Colorado, USA
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