1 files changed, 12 insertions, 15 deletions

diff --git a/kernel/futex.c b/kernel/futex.c
index 8e3c3ffe1b9a..d9b3a2228f9d 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -203,8 +203,6 @@ static void drop_futex_key_refs(union futex_key *key)
  * @uaddr:      virtual address of the futex
  * @fshared:    0 for a PROCESS_PRIVATE futex, 1 for PROCESS_SHARED
  * @key:        address where result is stored.
- * @rw:         mapping needs to be read/write (values: VERIFY_READ,
- *              VERIFY_WRITE)
  *
  * Returns a negative error code or 0
  * The key words are stored in *key on success.
@@ -216,7 +214,7 @@ static void drop_futex_key_refs(union futex_key *key)
  * lock_page() might sleep, the caller should not hold a spinlock.
  */
 static int
-get_futex_key(u32 __user *uaddr, int fshared, union futex_key *key, int rw)
+get_futex_key(u32 __user *uaddr, int fshared, union futex_key *key)
 {
         unsigned long address = (unsigned long)uaddr;
         struct mm_struct *mm = current->mm;
@@ -239,7 +237,7 @@ get_futex_key(u32 __user *uaddr, int fshared, union futex_key *key, int rw)
          *        but access_ok() should be faster than find_vma()
          */
         if (!fshared) {
-                if (unlikely(!access_ok(rw, uaddr, sizeof(u32))))
+                if (unlikely(!access_ok(VERIFY_WRITE, uaddr, sizeof(u32))))
                         return -EFAULT;
                 key->private.mm = mm;
                 key->private.address = address;
@@ -248,7 +246,7 @@ get_futex_key(u32 __user *uaddr, int fshared, union futex_key *key, int rw)
         }
 
 again:
-        err = get_user_pages_fast(address, 1, rw == VERIFY_WRITE, &page);
+        err = get_user_pages_fast(address, 1, 1, &page);
         if (err < 0)
                 return err;
 
@@ -867,7 +865,7 @@ static int futex_wake(u32 __user *uaddr, int fshared, int nr_wake, u32 bitset)
         if (!bitset)
                 return -EINVAL;
 
-        ret = get_futex_key(uaddr, fshared, &key, VERIFY_READ);
+        ret = get_futex_key(uaddr, fshared, &key);
         if (unlikely(ret != 0))
                 goto out;
 
@@ -913,10 +911,10 @@ futex_wake_op(u32 __user *uaddr1, int fshared, u32 __user *uaddr2,
         int ret, op_ret;
 
 retry:
-        ret = get_futex_key(uaddr1, fshared, &key1, VERIFY_READ);
+        ret = get_futex_key(uaddr1, fshared, &key1);
         if (unlikely(ret != 0))
                 goto out;
-        ret = get_futex_key(uaddr2, fshared, &key2, VERIFY_WRITE);
+        ret = get_futex_key(uaddr2, fshared, &key2);
         if (unlikely(ret != 0))
                 goto out_put_key1;
 
@@ -1175,11 +1173,10 @@ retry:
                 pi_state = NULL;
         }
 
-        ret = get_futex_key(uaddr1, fshared, &key1, VERIFY_READ);
+        ret = get_futex_key(uaddr1, fshared, &key1);
         if (unlikely(ret != 0))
                 goto out;
-        ret = get_futex_key(uaddr2, fshared, &key2,
-                            requeue_pi ? VERIFY_WRITE : VERIFY_READ);
+        ret = get_futex_key(uaddr2, fshared, &key2);
         if (unlikely(ret != 0))
                 goto out_put_key1;
 
@@ -1738,7 +1735,7 @@ static int futex_wait_setup(u32 __user *uaddr, u32 val, int fshared,
          */
 retry:
         q->key = FUTEX_KEY_INIT;
-        ret = get_futex_key(uaddr, fshared, &q->key, VERIFY_READ);
+        ret = get_futex_key(uaddr, fshared, &q->key);
         if (unlikely(ret != 0))
                 return ret;
 
@@ -1904,7 +1901,7 @@ static int futex_lock_pi(u32 __user *uaddr, int fshared,
         q.requeue_pi_key = NULL;
 retry:
         q.key = FUTEX_KEY_INIT;
-        ret = get_futex_key(uaddr, fshared, &q.key, VERIFY_WRITE);
+        ret = get_futex_key(uaddr, fshared, &q.key);
         if (unlikely(ret != 0))
                 goto out;
 
@@ -2023,7 +2020,7 @@ retry:
         if ((uval & FUTEX_TID_MASK) != task_pid_vnr(current))
                 return -EPERM;
 
-        ret = get_futex_key(uaddr, fshared, &key, VERIFY_WRITE);
+        ret = get_futex_key(uaddr, fshared, &key);
         if (unlikely(ret != 0))
                 goto out;
 
@@ -2215,7 +2212,7 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, int fshared,
         rt_waiter.task = NULL;
 
         key2 = FUTEX_KEY_INIT;
-        ret = get_futex_key(uaddr2, fshared, &key2, VERIFY_WRITE);
+        ret = get_futex_key(uaddr2, fshared, &key2);
         if (unlikely(ret != 0))
                 goto out;