From: Liam R. Howlett Date: Mon, 9 Nov 2020 19:45:37 +0000 (-0500) Subject: mm/mmap: Fix do_brk_munmap() multiple pages. X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=bc6ea83f7e82c3bfec685df2b8423527a012e3bd;p=users%2Fjedix%2Flinux-maple.git mm/mmap: Fix do_brk_munmap() multiple pages. This is rare, so just use the slower __do_munmap() Signed-off-by: Liam R. Howlett --- diff --git a/mm/mmap.c b/mm/mmap.c index b60891d00fc8..43100c78ed3a 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2853,8 +2853,8 @@ static int do_brk_munmap(struct ma_state *mas, struct vm_area_struct *vma, arch_unmap(mm, newbrk, oldbrk); - if (vma->vm_start >= newbrk) { // remove entire mapping. - ret = __do_munmap(mm, newbrk, oldbrk - newbrk, &uf, true); + if (vma->vm_start >= newbrk) { // remove entire mapping(s) + ret = __do_munmap(mm, newbrk, oldbrk-newbrk, uf, true); goto munmap_full_vma; } @@ -2864,6 +2864,7 @@ static int do_brk_munmap(struct ma_state *mas, struct vm_area_struct *vma, ret = userfaultfd_unmap_prep(&unmap, newbrk, oldbrk, uf); if (ret) return ret; + ret = 1; // Change the oldbrk of vma to the newbrk of the munmap area vma_adjust_trans_huge(vma, vma->vm_start, newbrk, 0);