From: Andrea Arcangeli Date: Tue, 1 Nov 2011 00:08:22 +0000 (-0700) Subject: mremap: check for overflow using deltas X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=ebed48460be5abd86d9a24fa7c66378e58109f30;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git mremap: check for overflow using deltas Using "- 1" relies on the old_end to be page aligned and PAGE_SIZE > 1, those are reasonable requirements but the check remains obscure and it looks more like an off by one error than an overflow check. This I feel will improve readability. Signed-off-by: Andrea Arcangeli Acked-by: Johannes Weiner Acked-by: Mel Gorman Acked-by: Rik van Riel Cc: Hugh Dickins Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/mm/mremap.c b/mm/mremap.c index 506fa44403d..195e866568e 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -141,9 +141,10 @@ unsigned long move_page_tables(struct vm_area_struct *vma, for (; old_addr < old_end; old_addr += extent, new_addr += extent) { cond_resched(); next = (old_addr + PMD_SIZE) & PMD_MASK; - if (next - 1 > old_end) - next = old_end; + /* even if next overflowed, extent below will be ok */ extent = next - old_addr; + if (extent > old_end - old_addr) + extent = old_end - old_addr; old_pmd = get_old_pmd(vma->vm_mm, old_addr); if (!old_pmd) continue;