diff options
Diffstat (limited to 'mm/vmalloc.c')
| -rw-r--r-- | mm/vmalloc.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 3e159b74cfab..bc21bf8e188b 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -4666,7 +4666,18 @@ long vread_iter(struct iov_iter *iter, const char *addr, size_t count) smp_rmb(); vaddr = (char *) va->va_start; - size = vm ? get_vm_area_size(vm) : va_size(va); + if (vm) + /* + * For VM_ALLOC areas, use nr_pages rather than + * get_vm_area_size() because vrealloc() may shrink + * the mapping without updating area->size. Other + * mapping types (vmap, ioremap) don't set nr_pages. + */ + size = (vm->flags & VM_ALLOC && vm->nr_pages) ? + (vm->nr_pages << PAGE_SHIFT) : + get_vm_area_size(vm); + else + size = va_size(va); if (addr >= vaddr + size) goto next_va; |