From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9302032D7F8; Sat, 12 Sep 2026 18:22:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789237352; cv=none; b=b50V+jbz6YaRq6eKQxB9R+Q4tG/qK60g0MRW36CC4UvJnj+DKsSJz4BrlEop7fWy/uw0V8BuKCflP0GZZAU90nzO+9RlfTgXqGtEfhSevlX/ejOqe/+1HqFVg0wh3vaPN0weg4QDbj3mO1uvkLXvTnG7TLKE1uR5ZT/CfmZuNxU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789237352; c=relaxed/simple; bh=Ffkc1mSa2/vTeY1qnHGSHdLWjZzTC8clI5eNmYf9WCA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ZMR6BpWwawPQGXwwqFdocM34bDid/A+hD4Ij8r3oz5boyhOmA+wLV00vAI6OVU3SRIN29NbJqHVFVLA2cAFi9o6nQvE4jQT7yaGN5IbUsXHLr7EEyWRN4J6MP3sr0RsCh4UcLXMHaVP+YzcLaIFrVa+rpY0dXWUw/K+2TklVfCQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=2vFNNFOx; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="2vFNNFOx" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 479891F000FF; Sat, 12 Sep 2026 18:22:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789237351; bh=GFVZJgGTshSnjiCj08inSEigdLXdfiyIaXkpggNqPq0=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=2vFNNFOxfcRNjxJB1/lmOBUJJN3VCNcWp4/FhOU0k8wK64XXKooQwpcIFT2JKk4fz B0bhLaNLgxFKJvHOQRjvDUi4HM/dOKHj+W8K+De8MfLREo791M+hR/1XQsOOD6+9DR aVpjVjqmF+kYc16TraT1+cERcT39BM0tJD54jAQQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, stable , Eulgyu Kim , Jaeyoung Chung , Lovekesh Solanki , Alan Stern Subject: [PATCH 5.15 241/935] USB: gadget: fix NULL pointer dereference in gadget_dev_ioctl() Date: Sat, 12 Sep 2026 08:54:31 +0200 Message-ID: <20260912065532.352967122@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065526.833703348@linuxfoundation.org> References: <20260912065526.833703348@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Lovekesh Solanki commit dd0eed9e165b1a6292f49e622e3dd0b7d99b106d upstream. gadget_dev_ioctl() reads dev->gadget before acquiring dev->lock, but dev->state is checked after acquiring the lock. Therefore a concurrent bind can change the device state between these operations, which can leave ioctl with a stale NULL gadget pointer and causing a NULL pointer dereference at gadget->ops->ioctl. Read dev->gadget while holding dev->lock so that the gadget pointer and device state are sampled consistently. Cc: stable Reported-by: Eulgyu Kim Link: https://lore.kernel.org/all/20260824113510.1141236-1-jjy600901@snu.ac.kr/ Reported-by: Jaeyoung Chung Link: https://lore.kernel.org/all/20260824113510.1141236-1-jjy600901@snu.ac.kr/ Signed-off-by: Lovekesh Solanki Reviewed-by: Alan Stern Link: https://patch.msgid.link/20260825171343.459630-1-lovekeshsolanki00@gmail.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/gadget/legacy/inode.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/usb/gadget/legacy/inode.c +++ b/drivers/usb/gadget/legacy/inode.c @@ -1250,10 +1250,11 @@ out: static long dev_ioctl (struct file *fd, unsigned code, unsigned long value) { struct dev_data *dev = fd->private_data; - struct usb_gadget *gadget = dev->gadget; + struct usb_gadget *gadget; long ret = -ENOTTY; spin_lock_irq(&dev->lock); + gadget = dev->gadget; if (dev->state == STATE_DEV_OPENED || dev->state == STATE_DEV_UNBOUND) { /* Not bound to a UDC */