mm/sharepool: check size=0 in mg_sp_make_share_k2u()
hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5QQPG CVE: NA -------------------------------- Add a size-0-check in mg_sp_make_share_k2u() to avoid passing 0-size spa to __insert_sp_area(). Signed-off-by: NGuo Mengqi <guomengqi3@huawei.com>
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