Memory leak issue in the mbedtls_rsa_private function

[lchjqss]

Summary

In function mbedtls_rsa_private:

In the flow of the mbedtls_rsa_private function, it first acquires the ctx lock, then initializes several mbedtls_mpi structure variables (such as T, P1, Q1, etc.). However, upon function exit, it releases the lock first and then frees the memory occupied by these mbedtls_mpi structures that were previously allocated. If unlocking fails during function exit, the memory allocated through mbedtls_alloc will not be released, leading to a memory leak issue.