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-rw-r--r--fs/ioprio.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/fs/ioprio.c b/fs/ioprio.c
index 5112554fd210..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->cred->uid != current_euid() &&
- task->cred->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)
@@ -131,7 +137,7 @@ asmlinkage long sys_ioprio_set(int which, int who, int ioprio)
break;
do_each_thread(g, p) {
- if (p->cred->uid != who)
+ if (__task_cred(p)->uid != who)
continue;
ret = set_task_ioprio(p, ioprio);
if (ret)
@@ -224,7 +230,7 @@ asmlinkage long sys_ioprio_get(int which, int who)
break;
do_each_thread(g, p) {
- if (p->cred->uid != user->uid)
+ if (__task_cred(p)->uid != user->uid)
continue;
tmpio = get_task_ioprio(p);
if (tmpio < 0)