1 files changed, 12 insertions, 6 deletions

diff --git a/fs/ioprio.c b/fs/ioprio.c
index 0f1b9515213b..5e6dbe8958fc 100644
--- a/fs/ioprio.c
+++ b/fs/ioprio.c
@@ -37,8 +37,8 @@ int set_task_ioprio(struct task_struct *task, int ioprio)
 
         rcu_read_lock();
         tcred = __task_cred(task);
-        if (tcred->uid != cred->euid &&
-            tcred->uid != cred->uid && !capable(CAP_SYS_NICE)) {
+        if (!uid_eq(tcred->uid, cred->euid) &&
+            !uid_eq(tcred->uid, cred->uid) && !capable(CAP_SYS_NICE)) {
                 rcu_read_unlock();
                 return -EPERM;
         }
@@ -65,6 +65,7 @@ SYSCALL_DEFINE3(ioprio_set, int, which, int, who, int, ioprio)
         struct task_struct *p, *g;
         struct user_struct *user;
         struct pid *pgrp;
+        kuid_t uid;
         int ret;
 
         switch (class) {
@@ -110,16 +111,19 @@ SYSCALL_DEFINE3(ioprio_set, int, which, int, who, int, ioprio)
                         } while_each_pid_thread(pgrp, PIDTYPE_PGID, p);
                         break;
                 case IOPRIO_WHO_USER:
+                        uid = make_kuid(current_user_ns(), who);
+                        if (!uid_valid(uid))
+                                break;
                         if (!who)
                                 user = current_user();
                         else
-                                user = find_user(who);
+                                user = find_user(uid);
 
                         if (!user)
                                 break;
 
                         do_each_thread(g, p) {
-                                if (__task_cred(p)->uid != who)
+                                if (!uid_eq(task_uid(p), uid))
                                         continue;
                                 ret = set_task_ioprio(p, ioprio);
                                 if (ret)
@@ -174,6 +178,7 @@ SYSCALL_DEFINE2(ioprio_get, int, which, int, who)
         struct task_struct *g, *p;
         struct user_struct *user;
         struct pid *pgrp;
+        kuid_t uid;
         int ret = -ESRCH;
         int tmpio;
 
@@ -203,16 +208,17 @@ SYSCALL_DEFINE2(ioprio_get, int, which, int, who)
                         } while_each_pid_thread(pgrp, PIDTYPE_PGID, p);
                         break;
                 case IOPRIO_WHO_USER:
+                        uid = make_kuid(current_user_ns(), who);
                         if (!who)
                                 user = current_user();
                         else
-                                user = find_user(who);
+                                user = find_user(uid);
 
                         if (!user)
                                 break;
 
                         do_each_thread(g, p) {
-                                if (__task_cred(p)->uid != user->uid)
+                                if (!uid_eq(task_uid(p), user->uid))
                                         continue;
                                 tmpio = get_task_ioprio(p);
                                 if (tmpio < 0)