misc: fastrpc: Fix double free of 'buf' in error path

CVE-2024-46741

What is CVE-2024-46741?

In the Linux kernel, a notable memory management issue exists within the Fastrpc driver, specifically related to the fastrpc_req_mmap function. This vulnerability stems from a design flaw where the fastrpc buffer can be improperly freed more than once, leading to a double free condition. In scenarios where the unmap operation is successful, the buffer is freed within the fastrpc_req_munmap_impl function. However, a subsequent unconditional call to fastrpc_buf_free() can trigger another deallocation attempt on the same buffer, resulting in a double free error. Such vulnerabilities can be exploited to corrupt memory, potentially leading to system instability or unauthorized access.

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