From nobody Thu Apr 2 20:20:31 2026 Received: from mail-wm1-f67.google.com (mail-wm1-f67.google.com [209.85.128.67]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 06EA61E5714 for ; Fri, 13 Feb 2026 10:30:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.67 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770978619; cv=none; b=nnOdbQ+wnCND3n9yAwTOaWNorJ3Vq1SFcOtG5chYkmXNz+oMkESlJq4aQ9d5fF2nSf4PZ8KNlZKzJ7LwU61sHx2vdWcw07VdDq6YYC+OPERmqBMwj1v04zEbysD5mbP+3aSjje2SD3KrumE7oBJ0Z2PTIs1BgGCM/h1wlT+hukw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770978619; c=relaxed/simple; bh=QBF3Ac3xkxqkAp9xA1hj0iOQsUrkxSjabfkicvCF9sI=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=XJfXLLdKcVuGjyYoCAZzFd2PLNw4dIGHw/YX+hf2E9XvyEHPhMBkIvG3qN4VlMm9ltVM1LXl5WhbNS62R5uT2Itp7t9fi1zRCnmMdITCWGbs3fqRL9HGASnv7bLsVHb0/SxWWK80no3B8/J9ze9YajG710A7B8FkY9b4GCYFphs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=WljyDgqm; arc=none smtp.client-ip=209.85.128.67 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="WljyDgqm" Received: by mail-wm1-f67.google.com with SMTP id 5b1f17b1804b1-48378136adcso575445e9.1 for ; Fri, 13 Feb 2026 02:30:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1770978616; x=1771583416; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=7fZJdgmpU6BMeb8xlHnJIHlivKZtK56Jb2TWWXtoNlQ=; b=WljyDgqmx0pdcMzTIo2xIScXOMl97WWiS0DTVp6Q6qenryqlZYLQ9atL6v8OjCnJ2k jxKVufGU+cxNUwqDAZQlWUTxk3tvkY/gApLhu6KfP3dgNRbceQVVLhcjqfO1vRPQEpCy oCT0OI1DbNeUqHMWn5yRRlbB9pYouIER1jWi0LqrJF+MigN7Qp4MgWfgk8Z2GcdamKHr EkZY8m1vx3IDhdwT2zmSuar3ggnqOY79ObzvIDKqMWgke8K8JLk5SQuWyEfzx03ez2nL IhCdh0t8jnjxm7Gz1vMb+3AnxKDg4sVyDedLd9fEUW7MFNvrUCiAR3VodKfTn0cWls1W oyzw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1770978616; x=1771583416; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=7fZJdgmpU6BMeb8xlHnJIHlivKZtK56Jb2TWWXtoNlQ=; b=UViHTKh69FGdJYtQmsNfcWx0IZEx5s4fj6npgRnYMIf5smV3OfDu6DNViDHI8B+CuO NCcV6bKQrb4AbO9LvOf44NAPwsWRHgoMm5iekmaF14u8ZpvpoSO+H9XwAijF7c0bcjt3 AU0Xo3vVuOZ14cdbmZGBSnmYozKxdDlJgMRc2hCJLlB7dk60IzXDKNypXV1w8Yi+OL/B VYuxEwVpnN7OkJ494KS4MKP+1Ghy5+G7EpmtfSrdtMeaVlFYqaWRGyagXthM3gnUDvcm 3fSG2ugEhMISmq/yeyPKvcaQ8ByuJ7ODgkFIzr9ypmvCPkFJsyfG+RDrYRPjjxS/IPtk qzFA== X-Forwarded-Encrypted: i=1; AJvYcCUp382gZcsAICqUqZyQDfv4TiMjU3YmFaNHxRGfb6Ag3R7tdg+erB2wP4uHXcJjZcpvn5GWEuM+BL6SAwI=@vger.kernel.org X-Gm-Message-State: AOJu0YwsFqbNEtjtI/n7EBypV5H/K6mk4JNNibZdY3ipd6gqF0iTLYdL xyxiwZ6RdwuKQ5CeveQbVZ8+ZeatkcgFTl3p10fASyMTrICfEG+03l0b X-Gm-Gg: AZuq6aKpt3TzUyEdPD6X3TxIy7acI6OKjlDdGUEJLe0itiqqylZTJerGgJnEvXoiTVq ke02jE+b5keZ5EE8EDuTB69oL8mqntSGjCv9wy3qyVPcPqvWGz3PmL23lCMgWowQ6FdTXqt1lM2 UWN2M9c0AnWuxMINKYxsWP6zdIFQSXM1+7lCT7YfoppwOpeKEIwtnrAdMwSbms7RueGfB3hda8A hU7FC1IVY0fJhKfs+Fvrj0Y/roMp1Mk6kAUoOhjPlVe5XT3kdVNgRGc0hF0Ha8fJRliHiOFfuNx FIduSHBvPb2PvPCV19CvBbNV85gWdzkzta/QXCxWTJdra/ojUY4Lpbpl6xRNQ2px6U7ohC1Iege 4IzilhKDdRmaYlgFRHFuoZ5zsONbDaxRjRreuef11EsOy8gv7yGSBozWDAdsjy9WHnaix5udT0c s7oveo6fhMBIfbjTtUpGFpYZnWr7Ucs0fZfQpB0r+SVTQeqmmrUnnJCeSUf1vd X-Received: by 2002:a05:600c:1909:b0:480:1c85:88bf with SMTP id 5b1f17b1804b1-48373a7438bmr18702645e9.27.1770978616023; Fri, 13 Feb 2026 02:30:16 -0800 (PST) Received: from lima-ubuntu.hz.ali.com ([47.246.98.214]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4835dcfafcdsm311730715e9.9.2026.02.13.02.30.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 13 Feb 2026 02:30:15 -0800 (PST) From: Qing Wang To: Alexander Viro , Christian Brauner , Jan Kara , Pavel Tikhomirov , Bhavik Sachdev , Andrei Vagin Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Qing Wang , syzbot+9e03a9535ea65f687a44@syzkaller.appspotmail.com Subject: [PATCH v3] statmount: Fix the null-ptr-deref in do_statmount() Date: Fri, 13 Feb 2026 18:30:06 +0800 Message-Id: <20260213103006.2472569-1-wangqing7171@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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: 0e5032237ee5 ("statmount: accept fd as a parameter") Reported-by: syzbot+9e03a9535ea65f687a44@syzkaller.appspotmail.com Closes: https://lore.kernel.org/all/698e287a.a70a0220.2c38d7.009e.GAE@googl= e.com/ Signed-off-by: Qing Wang Reviewed-by: Andrei Vagin Reviewed-by: Bhavik Sachdev --- fs/namespace.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/namespace.c b/fs/namespace.c index a67cbe42746d..90700df65f0d 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -5678,6 +5678,8 @@ static int do_statmount(struct kstatmount *s, u64 mnt= _id, u64 mnt_ns_id, =20 s->mnt =3D mnt_file->f_path.mnt; ns =3D 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 --=20 2.34.1