diff options
Diffstat (limited to 'arch/x86/mm/gup.c')
| -rw-r--r-- | arch/x86/mm/gup.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/arch/x86/mm/gup.c b/arch/x86/mm/gup.c index 2d1d784ad3f7..71da1bca13cb 100644 --- a/arch/x86/mm/gup.c +++ b/arch/x86/mm/gup.c @@ -303,11 +303,16 @@ int get_user_pages_fast(unsigned long start, int nr_pages, int write, start &= PAGE_MASK; addr = start; len = (unsigned long) nr_pages << PAGE_SHIFT; + end = start + len; - if (unlikely(!access_ok(write ? VERIFY_WRITE : VERIFY_READ, - (void __user *)start, len))) + if (end < start) goto slow_irqon; +#ifdef CONFIG_X86_64 + if (end >> __VIRTUAL_MASK_SHIFT) + goto slow_irqon; +#endif + /* * XXX: batch / limit 'nr', to avoid large irq off latency * needs some instrumenting to determine the common sizes used by |
