kernel/sys.c: fix prototype of prctl_get_tid_address()

tid_addr is not a "pointer to (pointer to int in userspace)"; it is in
fact a "pointer to (pointer to int in userspace) in userspace".  So
sparse rightfully complains about passing a kernel pointer to
put_user().

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/sys.c b/kernel/sys.c
index 84594bc..a730c03 100644 (file)
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -2238,12 +2238,12 @@ out:
 }
 
 #ifdef CONFIG_CHECKPOINT_RESTORE
-static int prctl_get_tid_address(struct task_struct *me, int __user **tid_addr)
+static int prctl_get_tid_address(struct task_struct *me, int __user * __user *tid_addr)
 {
        return put_user(me->clear_child_tid, tid_addr);
 }
 #else
-static int prctl_get_tid_address(struct task_struct *me, int __user **tid_addr)
+static int prctl_get_tid_address(struct task_struct *me, int __user * __user *tid_addr)
 {
        return -EINVAL;
 }
@@ -2427,7 +2427,7 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
                error = prctl_set_mm(arg2, arg3, arg4, arg5);
                break;
        case PR_GET_TID_ADDRESS:
-               error = prctl_get_tid_address(me, (int __user **)arg2);
+               error = prctl_get_tid_address(me, (int __user * __user *)arg2);
                break;
        case PR_SET_CHILD_SUBREAPER:
                me->signal->is_child_subreaper = !!arg2;