riscv: fix race when vmap stack overflow
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v6.0.12 by commit 879fabc5a95401d9bce357e4b1d24ae4a360a81f, it was introduced in version v5.14 by commit 31da94c25aea835ceac00575a9fd206c5a833fed. For more details please see the references link.