1 files changed, 6 insertions, 4 deletions

diff --git a/kernel/sys.c b/kernel/sys.c
index 585d6cd10040..26a6b73a6b85 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -162,6 +162,7 @@ SYSCALL_DEFINE3(setpriority, int, which, int, who, int, niceval)
         if (niceval > 19)
                 niceval = 19;
 
+        rcu_read_lock();
         read_lock(&tasklist_lock);
         switch (which) {
                 case PRIO_PROCESS:
@@ -189,16 +190,17 @@ SYSCALL_DEFINE3(setpriority, int, which, int, who, int, niceval)
                                  !(user = find_user(who)))
                                 goto out_unlock;        /* No processes for this user */
 
-                        do_each_thread(g, p)
+                        do_each_thread(g, p) {
                                 if (__task_cred(p)->uid == who)
                                         error = set_one_prio(p, niceval, error);
-                        while_each_thread(g, p);
+                        } while_each_thread(g, p);
                         if (who != cred->uid)
                                 free_uid(user);         /* For find_user() */
                         break;
         }
 out_unlock:
         read_unlock(&tasklist_lock);
+        rcu_read_unlock();
 out:
         return error;
 }
@@ -252,13 +254,13 @@ SYSCALL_DEFINE2(getpriority, int, which, int, who)
                                  !(user = find_user(who)))
                                 goto out_unlock;        /* No processes for this user */
 
-                        do_each_thread(g, p)
+                        do_each_thread(g, p) {
                                 if (__task_cred(p)->uid == who) {
                                         niceval = 20 - task_nice(p);
                                         if (niceval > retval)
                                                 retval = niceval;
                                 }
-                        while_each_thread(g, p);
+                        } while_each_thread(g, p);
                         if (who != cred->uid)
                                 free_uid(user);         /* for find_user() */
                         break;