From 280e36f0d5b997173d014c07484c03a7f7750668 Mon Sep 17 00:00:00 2001 From: Christian Brauner Date: Tue, 16 Jul 2024 09:19:11 +0200 Subject: [PATCH] nsfs: use cleanup guard Ensure that rcu read lock is given up before returning. Link: https://lore.kernel.org/r/20240716-elixier-fliesen-1ab342151a61@brauner Fixes: ca567df74a28 ("nsfs: add pid translation ioctls") Reported-by: syzbot+a3e82ae343b26b4d2335@syzkaller.appspotmail.com Signed-off-by: Christian Brauner --- fs/nsfs.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/fs/nsfs.c b/fs/nsfs.c index a4a925dce331..97c37a9631e5 100644 --- a/fs/nsfs.c +++ b/fs/nsfs.c @@ -174,14 +174,14 @@ static long ns_ioctl(struct file *filp, unsigned int ioctl, fallthrough; case NS_GET_PID_IN_PIDNS: fallthrough; - case NS_GET_TGID_IN_PIDNS: + case NS_GET_TGID_IN_PIDNS: { if (ns->ops->type != CLONE_NEWPID) return -EINVAL; ret = -ESRCH; pid_ns = container_of(ns, struct pid_namespace, ns); - rcu_read_lock(); + guard(rcu)(); if (ioctl == NS_GET_PID_IN_PIDNS || ioctl == NS_GET_TGID_IN_PIDNS) @@ -208,11 +208,11 @@ static long ns_ioctl(struct file *filp, unsigned int ioctl, ret = 0; break; } - rcu_read_unlock(); if (!ret) ret = -ESRCH; break; + } default: ret = -ENOTTY; }