ioprio: rcu_read_lock/unlock protect find_task_by_vpid call (V2)

[net-next-2.6.git] / fs / ioprio.c

diff --git a/fs/ioprio.c b/fs/ioprio.c
index 8def14e24c3758ed95571dd89c05d3d58586c768..2f7d05c899220e06d99ac9ecc9f8047903faa3a0 100644 (file)
--- a/fs/ioprio.c
+++ b/fs/ioprio.c
@@ -111,12 +111,14 @@ SYSCALL_DEFINE3(ioprio_set, int, which, int, who, int, ioprio)
        read_lock(&tasklist_lock);
        switch (which) {
                case IOPRIO_WHO_PROCESS:
+                       rcu_read_lock();
                        if (!who)
                                p = current;
                        else
                                p = find_task_by_vpid(who);
                        if (p)
                                ret = set_task_ioprio(p, ioprio);
+                       rcu_read_unlock();
                        break;
                case IOPRIO_WHO_PGRP:
                        if (!who)
@@ -205,12 +207,14 @@ SYSCALL_DEFINE2(ioprio_get, int, which, int, who)
        read_lock(&tasklist_lock);
        switch (which) {
                case IOPRIO_WHO_PROCESS:
+                       rcu_read_lock();
                        if (!who)
                                p = current;
                        else
                                p = find_task_by_vpid(who);
                        if (p)
                                ret = get_task_ioprio(p);
+                       rcu_read_unlock();
                        break;
                case IOPRIO_WHO_PGRP:
                        if (!who)