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pidfs: when time ns disabled add check for ioctl

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syzbot call pidfd_ioctl() with cmd "PIDFD_GET_TIME_NAMESPACE" and disabled
CONFIG_TIME_NS, since time_ns is NULL, it will make NULL ponter deref in
open_namespace.

Fixes: 5b08bd4085 ("pidfs: allow retrieval of namespace file descriptors") # mainline only
Reported-and-tested-by: syzbot+34a0ee986f61f15da35d@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=34a0ee986f61f15da35d
Signed-off-by: Edward Adam Davis <eadavis@qq.com>
Link: https://lore.kernel.org/r/tencent_7FAE8DB725EE0DD69236DDABDDDE195E4F07@qq.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Edward Adam Davis 2024-07-21 14:23:12 +08:00 committed by Christian Brauner
parent b40c8e7a03
commit f60d38cb02
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1 changed files with 2 additions and 0 deletions
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2
fs/pidfs.c
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@ -168,6 +168,8 @@ static long pidfd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
case PIDFD_GET_TIME_NAMESPACE:
get_time_ns(nsp->time_ns);
ns_common = to_ns_common(nsp->time_ns);
if (!nsp->time_ns)
return -EINVAL;
break;
case PIDFD_GET_TIME_FOR_CHILDREN_NAMESPACE:
get_time_ns(nsp->time_ns_for_children);