futex: Cover all PI opcodes with cmpxchg enabled check

[mirror_ubuntu-bionic-kernel.git] / kernel / futex.c

diff --git a/kernel/futex.c b/kernel/futex.c
index ea87f4d2f455c8c99164cb555287ad1c9fb165e3..4b1c4b6a339c5ac01c0118700f85919cd4d4b03f 100644 (file)
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -2628,6 +2628,16 @@ long do_futex(u32 __user *uaddr, int op, u32 val, ktime_t *timeout,
                        return -ENOSYS;
        }
 
+       switch (cmd) {
+       case FUTEX_LOCK_PI:
+       case FUTEX_UNLOCK_PI:
+       case FUTEX_TRYLOCK_PI:
+       case FUTEX_WAIT_REQUEUE_PI:
+       case FUTEX_CMP_REQUEUE_PI:
+               if (!futex_cmpxchg_enabled)
+                       return -ENOSYS;
+       }
+
        switch (cmd) {
        case FUTEX_WAIT:
                val3 = FUTEX_BITSET_MATCH_ANY;
@@ -2649,16 +2659,13 @@ long do_futex(u32 __user *uaddr, int op, u32 val, ktime_t *timeout,
                ret = futex_wake_op(uaddr, flags, uaddr2, val, val2, val3);
                break;
        case FUTEX_LOCK_PI:
-               if (futex_cmpxchg_enabled)
-                       ret = futex_lock_pi(uaddr, flags, val, timeout, 0);
+               ret = futex_lock_pi(uaddr, flags, val, timeout, 0);
                break;
        case FUTEX_UNLOCK_PI:
-               if (futex_cmpxchg_enabled)
-                       ret = futex_unlock_pi(uaddr, flags);
+               ret = futex_unlock_pi(uaddr, flags);
                break;
        case FUTEX_TRYLOCK_PI:
-               if (futex_cmpxchg_enabled)
-                       ret = futex_lock_pi(uaddr, flags, 0, timeout, 1);
+               ret = futex_lock_pi(uaddr, flags, 0, timeout, 1);
                break;
        case FUTEX_WAIT_REQUEUE_PI:
                val3 = FUTEX_BITSET_MATCH_ANY;