fcntl: fix potential deadlocks for &fown_struct.lock

[linux-2.6-block.git] / fs / fcntl.c

diff --git a/fs/fcntl.c b/fs/fcntl.c
index f946bec8f1f1b92fed4b851be2053ab7b0cc84d6..932ec1e9f5bfc173a8f2fb3516318bf9ea76976a 100644 (file)
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -150,7 +150,8 @@ void f_delown(struct file *filp)
 pid_t f_getown(struct file *filp)
 {
        pid_t pid = 0;
-       read_lock(&filp->f_owner.lock);
+
+       read_lock_irq(&filp->f_owner.lock);
        rcu_read_lock();
        if (pid_task(filp->f_owner.pid, filp->f_owner.pid_type)) {
                pid = pid_vnr(filp->f_owner.pid);
@@ -158,7 +159,7 @@ pid_t f_getown(struct file *filp)
                        pid = -pid;
        }
        rcu_read_unlock();
-       read_unlock(&filp->f_owner.lock);
+       read_unlock_irq(&filp->f_owner.lock);
        return pid;
 }
 
@@ -208,7 +209,7 @@ static int f_getown_ex(struct file *filp, unsigned long arg)
        struct f_owner_ex owner = {};
        int ret = 0;
 
-       read_lock(&filp->f_owner.lock);
+       read_lock_irq(&filp->f_owner.lock);
        rcu_read_lock();
        if (pid_task(filp->f_owner.pid, filp->f_owner.pid_type))
                owner.pid = pid_vnr(filp->f_owner.pid);
@@ -231,7 +232,7 @@ static int f_getown_ex(struct file *filp, unsigned long arg)
                ret = -EINVAL;
                break;
        }
-       read_unlock(&filp->f_owner.lock);
+       read_unlock_irq(&filp->f_owner.lock);
 
        if (!ret) {
                ret = copy_to_user(owner_p, &owner, sizeof(owner));
@@ -249,10 +250,10 @@ static int f_getowner_uids(struct file *filp, unsigned long arg)
        uid_t src[2];
        int err;
 
-       read_lock(&filp->f_owner.lock);
+       read_lock_irq(&filp->f_owner.lock);
        src[0] = from_kuid(user_ns, filp->f_owner.uid);
        src[1] = from_kuid(user_ns, filp->f_owner.euid);
-       read_unlock(&filp->f_owner.lock);
+       read_unlock_irq(&filp->f_owner.lock);
 
        err  = put_user(src[0], &dst[0]);
        err |= put_user(src[1], &dst[1]);