icmp: Fix data-races around sysctl.
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 v4.19.253 by commit edeec63b13c252193d626c2a48d7a2f0e7016dc2, it was introduced in version v3.18 by commit 4cdf507d54525842dfd9f6313fdafba039084046. For more details please see the references link.