From: Guo Mengqi <guomengqi3@huawei.com> 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: Guo Mengqi <guomengqi3@huawei.com> Reviewed-by: Weilong Chen <chenweilong@huawei.com> Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com> --- mm/share_pool.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/mm/share_pool.c b/mm/share_pool.c index d49c066d1229..fb1722e8fbf1 100644 --- a/mm/share_pool.c +++ b/mm/share_pool.c @@ -3097,6 +3097,11 @@ static int sp_k2u_prepare(unsigned long kva, unsigned long size, trace_sp_k2u_begin(kc); + if (!size) { + pr_err_ratelimited("k2u input size is 0.\n"); + return -EINVAL; + } + if (sp_flags & ~SP_FLAG_MASK) { pr_err_ratelimited("k2u sp_flags %lx error\n", sp_flags); return -EINVAL; -- 2.25.1