net/smc: check v2_ext_offset/eid_cnt/ism_gid_cnt when receiving proposal msg

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SUSE CVE-2024-49568

In the Linux kernel, the following vulnerability has been resolved: net/smc: check v2extoffset/eidcnt/ismgidcnt when receiving proposal msg When receiving proposal msg in server, the fields v2extoffset/ eidcnt/ismgidcnt in proposal msg are from the remote client and can not be fully trusted...