1 files changed, 12 insertions, 6 deletions

diff --git a/fs/ioprio.c b/fs/ioprio.c
index da3cc460d4df..3569e0ad86a2 100644
--- a/fs/ioprio.c
+++ b/fs/ioprio.c
@@ -31,10 +31,16 @@ static int set_task_ioprio(struct task_struct *task, int ioprio)
 {
         int err;
         struct io_context *ioc;
+        const struct cred *cred = current_cred(), *tcred;
 
-        if (task->uid != current->euid &&
-            task->uid != current->uid && !capable(CAP_SYS_NICE))
+        rcu_read_lock();
+        tcred = __task_cred(task);
+        if (tcred->uid != cred->euid &&
+            tcred->uid != cred->uid && !capable(CAP_SYS_NICE)) {
+                rcu_read_unlock();
                 return -EPERM;
+        }
+        rcu_read_unlock();
 
         err = security_task_setioprio(task, ioprio);
         if (err)
@@ -123,7 +129,7 @@ asmlinkage long sys_ioprio_set(int which, int who, int ioprio)
                         break;
                 case IOPRIO_WHO_USER:
                         if (!who)
-                                user = current->user;
+                                user = current_user();
                         else
                                 user = find_user(who);
 
@@ -131,7 +137,7 @@ asmlinkage long sys_ioprio_set(int which, int who, int ioprio)
                                 break;
 
                         do_each_thread(g, p) {
-                                if (p->uid != who)
+                                if (__task_cred(p)->uid != who)
                                         continue;
                                 ret = set_task_ioprio(p, ioprio);
                                 if (ret)
@@ -216,7 +222,7 @@ asmlinkage long sys_ioprio_get(int which, int who)
                         break;
                 case IOPRIO_WHO_USER:
                         if (!who)
-                                user = current->user;
+                                user = current_user();
                         else
                                 user = find_user(who);
 
@@ -224,7 +230,7 @@ asmlinkage long sys_ioprio_get(int which, int who)
                                 break;
 
                         do_each_thread(g, p) {
-                                if (p->uid != user->uid)
+                                if (__task_cred(p)->uid != user->uid)
                                         continue;
                                 tmpio = get_task_ioprio(p);
                                 if (tmpio < 0)