bpf, sockmap: fix race in sock_map_free()

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CVE-2022-50259 · Microsoft / collected KEV context

cve-program · CVE-2022-50259

• https://git.kernel.org/stable/c/4cabc3af4a6f36c222fecb15858c1060e59218e7
• https://git.kernel.org/stable/c/be719496ae6a7fc325e9e5056a52f63ebc84cc0c
• https://git.kernel.org/stable/c/a443c55d96dede82a724df6e70a318ad15c199e1
• https://git.kernel.org/stable/c/e8b2b392a646bf5cb9413c1cc7a39d99c1b65a62
• https://git.kernel.org/stable/c/5c3568166129bc73fd6b37748d2d8f95cd8f22f3
• https://git.kernel.org/stable/c/0a182f8d607464911756b4dbef5d6cad8de22469

No related operational record is retained in the current change model.