diff options
| -rw-r--r-- | arch/arm/kernel/traps.c | 17 |
1 files changed, 2 insertions, 15 deletions
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index 4d268d912b0e..9b2c5d42c143 100644 --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -550,24 +550,11 @@ static long do_cache_op_restart(struct restart_block *unused) static inline int do_cache_op(unsigned long start, unsigned long end, int flags) { - struct mm_struct *mm = current->active_mm; - struct vm_area_struct *vma; - if (end < start || flags) return -EINVAL; - down_read(&mm->mmap_sem); - vma = find_vma(mm, start); - if (!vma || vma->vm_start >= end) { - up_read(&mm->mmap_sem); - return -EINVAL; - } - - if (start < vma->vm_start) - start = vma->vm_start; - if (end > vma->vm_end) - end = vma->vm_end; - up_read(&mm->mmap_sem); + if (!access_ok(VERIFY_READ, start, end - start)) + return -EFAULT; return __do_cache_op(start, end); } |