rustls: fix a potential memory issue#19425
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Nov 10, 2025
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In rustls_client_config_builder_build(), the
config_builderis consumed viatry_box_from_ptr!(builder)and ownership is transferred to Rust. Calling rustls_client_config_builder_free() afterwards would result in double-free.An additional evidence is from the usage in rustls-ffi's test code at https://github.com/rustls/rustls-ffi/blob/main/librustls/tests/client.c#L431, where the builder is not freed and set to NULL after calling rustls_client_config_builder_build().
Other:
backend->configis set ifrustls_client_config_builder_build()is ok.