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-rw-r--r--arch/arm/kernel/traps.c17
1 files changed, 2 insertions, 15 deletions
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 4d268d9..9b2c5d4 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);
}