From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793820184; b=zEHpdiAy2iXAFqsMPPpXLImBSJd4fU+8cnythsLHcnXDQgI/A8JrN3RQ1jODG+C1ivul HeCwEuOh5wz0x60mUIdmKpE+1COzC75rfQRkV0JEa4Gbf1jwf/LJZmQOGChY92iGS1vpn 0t3Zu8p1T7vZ5MJjP4m91evb9xkQRV5BN5PzTTm1x5vzrCYkFp6+peRpOeuDDB05orO1n jt1bbHBNA/0y0jaetIGWUcs7HY5vbmu+88TtSsx3RGlbvFH/1J/zlfjCKlbO7wTaHEP6z bAHPS9yERgT8JiUkVBHGr6fYKib59aA5ZmWpWi3qu5iv96dG7JVaLH+eoQHhgF9PsPQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793820184; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID: In-Reply-To:References:MIME-Version:Content-Type:X-Mailer: X-Developer-Signature:X-Developer-Key:Content-Transfer-Encoding; bh=LkQzylMBPw/rjuFeKsFyNpbMkN4WRhLixyhJUzJNoRI=; b=gGsDmW0brNhffMD3BaoHbAzstTWuJHPgjg/PGKEFVCkd/agODJOQJNyNiEXMfNIfCzeB sA3otoO/At+SNjpE/9XoHwXZSNfefxAff6LbPcuGhM3efsvD4vYCIYFMSLduGnleCpzYM tczIKeyxkFfiXrSTdf/7TNmv1lo21r0DdTd3hN1Mi04+raakzjFvEP78icuCaSbLp07zh Of3Zy84XTjQYTxUm4x7BwBIRInOh19LjDWB93FciZMYGSP++9nUFttTQFC31/nMrwAxs9 bvqi3R14RmoYcTjapSxOxBStdP+zf+VKObbeTlCedLP6fixgPXlDsMK4MlF0RFuQEsA== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=BSonnJ4f; 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 83F64606C938; Wed, 4 Nov 2026 19:23:04 +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=BSonnJ4f Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1CF251F000C1; Wed, 4 Nov 2026 19:22:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793820184; bh=LkQzylMBPw/rjuFeKsFyNpbMkN4WRhLixyhJUzJNoRI=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=BSonnJ4f7yMH1lOXY4xKOkMixSuWwienI9M9D7I6GKt/5EQqTgA/iQ2QAehjV234u YFAT2O6XmzTeX9l9nI78c+OuI+vrlyGDMu28/cFZIebS7LVWB5yQYSIHuBROdXKmV/ POjWxbi8h52DJlKnFdWShCkvORSC+wER9+m5Nc5I6YVlHAPNaszz5jWURsoc99UxNe HtvfWbnrw5mLr/fLV64EYTb0o/e2FYPIZl4AGyyNRZpEiF3Dc+H3TPm7clGTz3Hei1 RJrKLHUu/lKQlBjZQXWIB8Dd4bHzwpk5JakS/D+nuaTqJL6rz4xnryqSZJ8XfbWmNB KVSx5DWPRFPdg== 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 RESEND v2 28/51] ntfs3: don't warn when a huge label is written Date: Wed, 4 Nov 2026 20:22:49 +0100 Message-ID: <20261104-work-procfs-bugfixes-v2-28-021c84d852e0@kernel.org> In-Reply-To: <20261104-work-procfs-bugfixes-v2-0-021c84d852e0@kernel.org> References: <20261104-work-procfs-bugfixes-v2-0-021c84d852e0@kernel.org> X-Mailing-List: linux-input@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=owGbwMvMwCU28Zj0gdSKO4sYT6slMWS9bnz7K1goQOfBzlUZyTmXuaJF8js/Rb7//OzHk6rr7 JYtL5/6d5SyMIhxMciKKbI4tJuEyy3nqdhslKkBM4eVCWQIAxenAExEvIKRYcP67G2i6Wf/B2W2 7txs3neapZ43c+rjv8+u3w5s27n+2X+Gv2LPNsjtr59gXDV90xsjczOOh182+JoIeRm6VIqkhV3 i5wQA 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