CVE-2024-49568 net/smc: check v2_ext_offset/eid_cnt/ism_gid_cnt when receiving proposal msg

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...