From a541bd47b87271254fde0e358d14604396e87495 Mon Sep 17 00:00:00 2001 From: Guo Mengqi Date: Thu, 29 Sep 2022 11:39:50 +0000 Subject: [PATCH] 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: Guo Mengqi Reviewed-by: Weilong Chen Signed-off-by: Yongqiang Liu --- 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; -- GitLab