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statmount: Fix the null-ptr-deref in do_statmount()

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If the mount is internal, it's mnt_ns will be MNT_NS_INTERNAL, which is
defined as ERR_PTR(-EINVAL). So, in the do_statmount(), need to check ns
of mount by IS_ERR() and return.

Fixes: 0e5032237e ("statmount: accept fd as a parameter")
Reported-by: syzbot+9e03a9535ea65f687a44@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/all/698e287a.a70a0220.2c38d7.009e.GAE@google.com/
Signed-off-by: Qing Wang <wangqing7171@gmail.com>
Link: https://patch.msgid.link/20260213103006.2472569-1-wangqing7171@gmail.com
Reviewed-by: Bhavik Sachdev <b.sachdev1904@gmail.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Qing Wang 2026-02-13 18:30:06 +08:00 • committed by Christian Brauner
parent 9eed043d10
commit 81f16c9778
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1 changed files with 2 additions and 0 deletions
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2
fs/namespace.c
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@ -5678,6 +5678,8 @@ static int do_statmount(struct kstatmount *s, u64 mnt_id, u64 mnt_ns_id,
s->mnt = mnt_file->f_path.mnt;
ns = real_mount(s->mnt)->mnt_ns;
if (IS_ERR(ns))
return PTR_ERR(ns);
if (!ns)
/*
* We can't set mount point and mnt_ns_id since we don't have a