btrfs: fix race between quota disable and quota assign ioctls

[platform/kernel/linux-rpi.git] / lib / test_lockup.c

diff --git a/lib/test_lockup.c b/lib/test_lockup.c
index 906b598..c3fd87d 100644 (file)
--- a/lib/test_lockup.c
+++ b/lib/test_lockup.c
@@ -417,9 +417,14 @@ static bool test_kernel_ptr(unsigned long addr, int size)
                return false;
 
        /* should be at least readable kernel address */
-       if (access_ok(ptr, 1) ||
-           access_ok(ptr + size - 1, 1) ||
-           get_kernel_nofault(buf, ptr) ||
+       if (!IS_ENABLED(CONFIG_ALTERNATE_USER_ADDRESS_SPACE) &&
+           (access_ok((void __user *)ptr, 1) ||
+            access_ok((void __user *)ptr + size - 1, 1))) {
+               pr_err("user space ptr invalid in kernel: %#lx\n", addr);
+               return true;
+       }
+
+       if (get_kernel_nofault(buf, ptr) ||
            get_kernel_nofault(buf, ptr + size - 1)) {
                pr_err("invalid kernel ptr: %#lx\n", addr);
                return true;