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authorDavid S. Miller <davem@davemloft.net>2010-11-14 19:57:05 (GMT)
committerDavid S. Miller <davem@davemloft.net>2010-11-14 19:57:05 (GMT)
commitc25ecd0a21d5e08160cb5cc984f9e2b8ee347443 (patch)
tree0e4dcacf1bf603f259b8d27445a10e60fa8d00d7 /fs/ioprio.c
parent190683a9d5457e6d962c232ffbecac3ab158dddd (diff)
parent9457b24a0955bbdd2e89220a75de69fe09501bba (diff)
downloadlinux-c25ecd0a21d5e08160cb5cc984f9e2b8ee347443.tar.xz
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
Diffstat (limited to 'fs/ioprio.c')
-rw-r--r--fs/ioprio.c18
1 files changed, 16 insertions, 2 deletions
diff --git a/fs/ioprio.c b/fs/ioprio.c
index 748cfb9..2f7d05c 100644
--- 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)
@@ -139,7 +141,12 @@ SYSCALL_DEFINE3(ioprio_set, int, which, int, who, int, ioprio)
break;
do_each_thread(g, p) {
- if (__task_cred(p)->uid != who)
+ int match;
+
+ rcu_read_lock();
+ match = __task_cred(p)->uid == who;
+ rcu_read_unlock();
+ if (!match)
continue;
ret = set_task_ioprio(p, ioprio);
if (ret)
@@ -200,12 +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)
@@ -232,7 +241,12 @@ SYSCALL_DEFINE2(ioprio_get, int, which, int, who)
break;
do_each_thread(g, p) {
- if (__task_cred(p)->uid != user->uid)
+ int match;
+
+ rcu_read_lock();
+ match = __task_cred(p)->uid == user->uid;
+ rcu_read_unlock();
+ if (!match)
continue;
tmpio = get_task_ioprio(p);
if (tmpio < 0)