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-rw-r--r--fs/fcntl.c19
1 files changed, 13 insertions, 6 deletions
diff --git a/fs/fcntl.c b/fs/fcntl.c
index 05b36b28f2e8..483ef8861376 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -148,11 +148,15 @@ void f_delown(struct file *filp)
pid_t f_getown(struct file *filp)
{
- pid_t pid;
+ pid_t pid = 0;
read_lock(&filp->f_owner.lock);
- pid = pid_vnr(filp->f_owner.pid);
- if (filp->f_owner.pid_type == PIDTYPE_PGID)
- pid = -pid;
+ rcu_read_lock();
+ if (pid_task(filp->f_owner.pid, filp->f_owner.pid_type)) {
+ pid = pid_vnr(filp->f_owner.pid);
+ if (filp->f_owner.pid_type == PIDTYPE_PGID)
+ pid = -pid;
+ }
+ rcu_read_unlock();
read_unlock(&filp->f_owner.lock);
return pid;
}
@@ -200,11 +204,14 @@ static int f_setown_ex(struct file *filp, unsigned long arg)
static int f_getown_ex(struct file *filp, unsigned long arg)
{
struct f_owner_ex __user *owner_p = (void __user *)arg;
- struct f_owner_ex owner;
+ struct f_owner_ex owner = {};
int ret = 0;
read_lock(&filp->f_owner.lock);
- owner.pid = pid_vnr(filp->f_owner.pid);
+ rcu_read_lock();
+ if (pid_task(filp->f_owner.pid, filp->f_owner.pid_type))
+ owner.pid = pid_vnr(filp->f_owner.pid);
+ rcu_read_unlock();
switch (filp->f_owner.pid_type) {
case PIDTYPE_PID:
owner.type = F_OWNER_TID;