diff options
Diffstat (limited to 'net/bpfilter/bpfilter_kern.c')
| -rw-r--r-- | net/bpfilter/bpfilter_kern.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/net/bpfilter/bpfilter_kern.c b/net/bpfilter/bpfilter_kern.c index b13d058f8c34..09522573f611 100644 --- a/net/bpfilter/bpfilter_kern.c +++ b/net/bpfilter/bpfilter_kern.c @@ -24,17 +24,19 @@ static void shutdown_umh(struct umh_info *info) { struct task_struct *tsk; + if (!info->pid) + return; tsk = pid_task(find_vpid(info->pid), PIDTYPE_PID); if (tsk) force_sig(SIGKILL, tsk); fput(info->pipe_to_umh); fput(info->pipe_from_umh); + info->pid = 0; } static void __stop_umh(void) { - if (IS_ENABLED(CONFIG_INET) && - bpfilter_process_sockopt) { + if (IS_ENABLED(CONFIG_INET)) { bpfilter_process_sockopt = NULL; shutdown_umh(&info); } @@ -55,7 +57,7 @@ static int __bpfilter_process_sockopt(struct sock *sk, int optname, struct mbox_reply reply; loff_t pos; ssize_t n; - int ret; + int ret = -EFAULT; req.is_set = is_set; req.pid = current->pid; @@ -63,6 +65,8 @@ static int __bpfilter_process_sockopt(struct sock *sk, int optname, req.addr = (long)optval; req.len = optlen; mutex_lock(&bpfilter_lock); + if (!info.pid) + goto out; n = __kernel_write(info.pipe_to_umh, &req, sizeof(req), &pos); if (n != sizeof(req)) { pr_err("write fail %zd\n", n); |