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-rw-r--r--kernel/futex.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/kernel/futex.c b/kernel/futex.c
index fb65e822fc41..d73ef1f3e55d 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -304,8 +304,14 @@ void put_futex_key(int fshared, union futex_key *key)
304 */ 304 */
305static int fault_in_user_writeable(u32 __user *uaddr) 305static int fault_in_user_writeable(u32 __user *uaddr)
306{ 306{
307 int ret = get_user_pages(current, current->mm, (unsigned long)uaddr, 307 struct mm_struct *mm = current->mm;
308 1, 1, 0, NULL, NULL); 308 int ret;
309
310 down_read(&mm->mmap_sem);
311 ret = get_user_pages(current, mm, (unsigned long)uaddr,
312 1, 1, 0, NULL, NULL);
313 up_read(&mm->mmap_sem);
314
309 return ret < 0 ? ret : 0; 315 return ret < 0 ? ret : 0;
310} 316}
311 317