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smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=JXuPQ0ie; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 438E5606A7E4; Wed, 4 Nov 2026 17:52:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=JXuPQ0ie Received: by smtp.kernel.org (Postfix) with ESMTPSA id 428D51F0093A; Wed, 4 Nov 2026 17:52:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793814772; bh=LkQzylMBPw/rjuFeKsFyNpbMkN4WRhLixyhJUzJNoRI=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=JXuPQ0ieI1SmEXC52KDOcGy2C42dUQXH2gWt2mtcU1/uOST36dyA2aX/TbZituA2X Uhu3k1qct8vUKtDQH86VU1fhcBrjtbnzssmyZOcNcGl5JFmkchB4Gpruy1pXNgGar2 VxVKlSU3xlY2ad6FO1CicLCPJyfh4ydr4gwsesh5g7agPQ4ipkIS7Cs9Wpj/e9EmLS Jm7RvFMHC/cB0vL14NXKg9Z/LHaENtZFhX3CEfJQZj2LcqrxZuIhRnv467SSOX8+tP 0daQmY4DIeH2JUseA+pOpqhVDaW3Hc6WCgGMkzhZymUpdndKfNcU8aZ5068txhavYL LTnnyBYHI3CAQ== From: Christian Brauner To: linux-fsdevel@vger.kernel.org Cc: Linus Torvalds , Jann Horn , Josef Bacik , Chris Mason , Jeff Layton , NeilBrown , Eric Dumazet , Thomas Gleixner , Al Viro , Jonathan Corbet , Christoph Hellwig , Greg Kroah-Hartman , Joel Granados , Kees Cook , Jan Kara , Jan Kara , linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-acpi@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, linux-um@lists.infradead.org, linux-wireless@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, netdev@vger.kernel.org, ntfs3@lists.linux.dev, platform-driver-x86@vger.kernel.org, coreteam@netfilter.org, kexec@lists.infradead.org, linux-pci@vger.kernel.org, linux-sound@vger.kernel.org, netfilter-devel@vger.kernel.org, dri-devel@lists.freedesktop.org, ibm-acpi-devel@lists.sourceforge.net, jfs-discussion@lists.sourceforge.net, linux-alpha@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-cifs@vger.kernel.org, linux-fbdev@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-mm@kvack.org, linux-sh@vger.kernel.org, linux-usb@vger.kernel.org, samba-technical@lists.samba.org, sparclinux@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-doc@vger.kernel.org, linux-serial@vger.kernel.org, linux-atm-general@lists.sourceforge.net, Takashi Iwai , linux-input@vger.kernel.org, linux-raid@vger.kernel.org, linux-ext4@vger.kernel.org, linux-modules@vger.kernel.org, linux-debuggers@vger.kernel.org, "Christian Brauner (Amutable)" , Chuck Lever , stable@vger.kernel.org Subject: [PATCH v2 28/51] ntfs3: don't warn when a huge label is written Date: Wed, 4 Nov 2026 18:47:14 +0100 Message-ID: <20261104-work-procfs-bugfixes-v2-28-bbf7d5546809@kernel.org> In-Reply-To: <20261104-work-procfs-bugfixes-v2-0-bbf7d5546809@kernel.org> References: <20261104-work-procfs-bugfixes-v2-0-bbf7d5546809@kernel.org> X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" X-Mailer: b4 0.17-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=1211; i=brauner@kernel.org; h=from:subject:message-id; bh=CQmQXvWqu+qpRxwX3Ai9kAzqqtrenD8xJsc3ckb17sQ=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWS9znv41bfhRbr0hB7+QH1DQe2NteXb2LY+9z1XbHd4a cOjhdu2dJSyMIhxMciKKbI4tJuEyy3nqdhslKkBM4eVCWQIAxenAExkohAjw4rCmq+PWwJsL999 t/rf/719dR9cv2g/ad2gpsY5lzHE/RYjw7O2xVsFYh6FLFHbxmXmqiNfEK+8fvH1tXZe9j8O88X sYQIA X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Content-Transfer-Encoding: 8bit ntfs3_label_write() allocates as many bytes as are written with plain kmalloc(). A write that is larger than what kmalloc() can hand out then trips the page allocator's warning, which panics a panic_on_warn kernel. Use memdup_user(), which fails such an allocation quietly with -ENOMEM like before. Fixes: 7832e123490a ("fs/ntfs3: Add support /proc/fs/ntfs3//volinfo and /proc/fs/ntfs3//label") Cc: stable@vger.kernel.org Signed-off-by: Christian Brauner (Amutable) --- fs/ntfs3/super.c | 11 +++-------- 1 file changed, 3 insertions(+), 8 deletions(-) diff --git a/fs/ntfs3/super.c b/fs/ntfs3/super.c index 29aabdc8a801..37e27b73b7a5 100644 --- a/fs/ntfs3/super.c +++ b/fs/ntfs3/super.c @@ -576,15 +576,10 @@ static ssize_t ntfs3_label_write(struct file *file, const char __user *buffer, if (sb_rdonly(sb)) return -EROFS; - label = kmalloc(count, GFP_NOFS); + label = memdup_user(buffer, count); + if (IS_ERR(label)) + return PTR_ERR(label); - if (!label) - return -ENOMEM; - - if (copy_from_user(label, buffer, ret)) { - ret = -EFAULT; - goto out; - } while (ret > 0 && label[ret - 1] == '\n') ret -= 1; -- 2.53.0