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authorZeng Zhaoming <zengzm.kernel@gmail.com>2010-12-02 14:31:13 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-12-02 14:51:14 -0800
commit55cfaa3cbdd29c4919ecb5fb8965c310f357e48c (patch)
tree914fad20ce59c42bd3781820c8fb73286581a5ae /mm
parent1f64d69c7ad2e48e697493e45590679f7a69b7b2 (diff)
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mm/mempolicy.c: add rcu read lock to protect pid structure
find_task_by_vpid() should be protected by rcu_read_lock(), to prevent free_pid() reclaiming pid. Signed-off-by: Zeng Zhaoming <zengzm.kernel@gmail.com> Cc: "Paul E. McKenney" <paulmck@us.ibm.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Christoph Lameter <cl@linux-foundation.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/mempolicy.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 4a57f135b76..11ff260fb28 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1307,15 +1307,18 @@ SYSCALL_DEFINE4(migrate_pages, pid_t, pid, unsigned long, maxnode,
goto out;
/* Find the mm_struct */
+ rcu_read_lock();
read_lock(&tasklist_lock);
task = pid ? find_task_by_vpid(pid) : current;
if (!task) {
read_unlock(&tasklist_lock);
+ rcu_read_unlock();
err = -ESRCH;
goto out;
}
mm = get_task_mm(task);
read_unlock(&tasklist_lock);
+ rcu_read_unlock();
err = -EINVAL;
if (!mm)