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 v4.9.324 by commit 1740e5922fbb705637ae9fa5203db132fc45f9f6, it was introduced in version v3.18 by commit 4cdf507d54525842dfd9f6313fdafba039084046. For more details please see the references link.