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Thu, 12 Feb 2026 23:01:18 -0800 (PST) From: Qing Wang To: syzbot+9e03a9535ea65f687a44@syzkaller.appspotmail.com Cc: brauner@kernel.org, jack@suse.cz, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Subject: Re: [syzbot] [fs?] general protection fault in grab_requested_root Date: Fri, 13 Feb 2026 15:01:13 +0800 Message-Id: <20260213070113.2371490-1-wangqing7171@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <698e287a.a70a0220.2c38d7.009e.GAE@google.com> References: <698e287a.a70a0220.2c38d7.009e.GAE@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit #syz test diff --git a/fs/namespace.c b/fs/namespace.c index a67cbe42746d..8124f33d89a2 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -5678,13 +5678,17 @@ 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 (!ns) + if (IS_ERR_OR_NULL(ns)) { /* * We can't set mount point and mnt_ns_id since we don't have a * ns for the mount. This can happen if the mount is unmounted * with MNT_DETACH. */ s->mask &= ~(STATMOUNT_MNT_POINT | STATMOUNT_MNT_NS_ID); + if (IS_ERR(ns)) + return PTR_ERR(ns); + ns = NULL; + } } else { /* Has the namespace already been emptied? */ if (mnt_ns_id && mnt_ns_empty(ns))