From: Liu Xiang liu.xiang@zlingsmart.com
mainline inclusion from mainline-v5.11-rc1 commit 0a4f3d1bb91cac4efdd780373638b6a1a4c24c51 category: bugfix bugzilla: NA CVE: NA
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On 64-bit machine, delta variable in hugetlb_acct_memory() may be larger than 0xffffffff, but gather_surplus_pages() can only use the low 32-bit value now. So we need to fix type of delta parameter and related local variables in gather_surplus_pages().
Link: https://lkml.kernel.org/r/1605793733-3573-1-git-send-email-liu.xiang@zlingsm... Reported-by: Ma Chenggong ma.chenggong@zlingsmart.com Signed-off-by: Liu Xiang liu.xiang@zlingsmart.com Signed-off-by: Pan Jiagen pan.jiagen@zlingsmart.com Reviewed-by: Mike Kravetz mike.kravetz@oracle.com Cc: Liu Xiang liuxiang_1999@126.com Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Linus Torvalds torvalds@linux-foundation.org
conflict: mm/hugetlb.c
Signed-off-by: Tong Tiangen tongtiangen@huawei.com Reviewed-by: Chen Wandun chenwandun@huawei.com Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- mm/hugetlb.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 6e84c46180ecd..27d03b7197eea 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1822,12 +1822,13 @@ struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma, * Increase the hugetlb pool such that it can accommodate a reservation * of size 'delta'. */ -static int gather_surplus_pages(struct hstate *h, int delta) +static int gather_surplus_pages(struct hstate *h, long delta) { struct list_head surplus_list; struct page *page, *tmp; - int ret, i; - int needed, allocated; + int ret; + long i; + long needed, allocated; bool alloc_ok = true;
needed = (h->resv_huge_pages + delta) - h->free_huge_pages;