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bpo-43577: Fix deadlock with SSLContext._msg_callback and sni_callback (GH-24957)

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OpenSSL copies the internal message callback from SSL_CTX->msg_callback to
SSL->msg_callback. SSL_set_SSL_CTX() does not update SSL->msg_callback
to use the callback value of the new context.

PySSL_set_context() now resets the callback and _PySSL_msg_callback()
resets thread state in error path.

Signed-off-by: Christian Heimes <christian@python.org>
This commit is contained in:
Christian Heimes 2021-03-21 16:13:09 +01:00 • committed by GitHub
parent 20a5b7e986
commit 77cde5042a
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4 changed files with 29 additions and 0 deletions
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Modules/_ssl/debughelpers.c
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@ -23,6 +23,7 @@ _PySSL_msg_callback(int write_p, int version, int content_type,
ssl_obj = (PySSLSocket *)SSL_get_app_data(ssl);
assert(PySSLSocket_Check(ssl_obj));
if (ssl_obj->ctx->msg_cb == NULL) {
PyGILState_Release(threadstate);
return;
}