From 7511c3ede752e6dd67df20779b4e11effe102637 Mon Sep 17 00:00:00 2001 From: Jerome Marchand Date: Fri, 20 Nov 2015 15:57:02 -0800 Subject: [PATCH] mm: vmalloc: don't remove inexistent guard hole in remove_vm_area() Commit 71394fe50146 ("mm: vmalloc: add flag preventing guard hole allocation") missed a spot. Currently remove_vm_area() decreases vm->size to "remove" the guard hole page, even when it isn't present. All but one users just free the vm_struct rigth away and never access vm->size anyway. Don't touch the size in remove_vm_area() and have __vunmap() use the proper get_vm_area_size() helper. Signed-off-by: Jerome Marchand Acked-by: Andrey Ryabinin Acked-by: David Rientjes Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/vmalloc.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/mm/vmalloc.c b/mm/vmalloc.c index d04563480c94..8e3c9c5a3042 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -1443,7 +1443,6 @@ struct vm_struct *remove_vm_area(const void *addr) vmap_debug_free_range(va->va_start, va->va_end); kasan_free_shadow(vm); free_unmap_vmap_area(va); - vm->size -= PAGE_SIZE; return vm; } @@ -1468,8 +1467,8 @@ static void __vunmap(const void *addr, int deallocate_pages) return; } - debug_check_no_locks_freed(addr, area->size); - debug_check_no_obj_freed(addr, area->size); + debug_check_no_locks_freed(addr, get_vm_area_size(area)); + debug_check_no_obj_freed(addr, get_vm_area_size(area)); if (deallocate_pages) { int i;