In the Linux kernel, the following vulnerability has been resolved:

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

smatch warning:
drivers/misc/fastrpc.c:1926 fastrpc_req_mmap() error: double free of 'buf'

In fastrpc_req_mmap() error path, the fastrpc buffer is freed in
fastrpc_req_munmap_impl() if unmap is successful.

But in the end, there is an unconditional call to fastrpc_buf_free().
So the above case triggers the double free of fastrpc buf.

References

• https://nvd.nist.gov/vuln/detail/CVE-2024-46741
• https://git.kernel.org/stable/c/bfc1704d909dc9911a558b1a5833d3d61a43a1f2
• https://git.kernel.org/stable/c/e8c276d4dc0e19ee48385f74426aebc855b49aaf
• https://git.kernel.org/stable/c/f77dc8a75859e559f3238a6d906206259227985e