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[147.75.80.249]) by mx.google.com with ESMTPS id bj22-20020a170906b05600b00a0fe0ed680esi7596006ejb.178.2023.12.15.13.08.12 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 Dec 2023 13:08:12 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel+bounces-1653-ouuuleilei=gmail.com@vger.kernel.org designates 147.75.80.249 as permitted sender) client-ip=147.75.80.249; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20230601 header.b=X5mIv3ff; spf=pass (google.com: domain of linux-kernel+bounces-1653-ouuuleilei=gmail.com@vger.kernel.org designates 147.75.80.249 as permitted sender) smtp.mailfrom="linux-kernel+bounces-1653-ouuuleilei=gmail.com@vger.kernel.org"; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by am.mirrors.kernel.org (Postfix) with ESMTPS id DB5111F21D91 for ; Fri, 15 Dec 2023 21:08:11 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 35E0647F77; Fri, 15 Dec 2023 21:07:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="X5mIv3ff" X-Original-To: linux-kernel@vger.kernel.org Received: from mail-pj1-f74.google.com (mail-pj1-f74.google.com [209.85.216.74]) (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 3ECB81945E for ; Fri, 15 Dec 2023 21:07:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--arakesh.bounces.google.com Received: by mail-pj1-f74.google.com with SMTP id 98e67ed59e1d1-28b36133eacso687878a91.1 for ; Fri, 15 Dec 2023 13:07:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1702674471; x=1703279271; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=bDHNy6mRe16xdviFUOtx/SHX4cJgboHVcJcVFUnLuxc=; b=X5mIv3ffaTBYfvThLWYS4xlLcNwHbT/OvDPbCQuXaYXw+GIDY5MyFc7k+bkv56PIeg JR6PrxZFu6p8w21q6Tx1G5JpNUKkuluSjLS3GyIPfSWrKEsWc6nprq4Qjji/+L59gTWP h63jOMtec4ypTWzMMmNemEKoyUndWUYsiN9tnubylZK6IppTwBtQRcQNbQj7RluBh5/N A9qrJrHfAEjRgo5ZiPVpCeXOuXSYhpvgYsi5g0bLJ/7KmbDhL1DYC/5bqufosJKD7RY5 gjX04h0zxXbDW4ntlW/SDvB/YWdaZ9vGS9Av4fhlanOSOb0nZ5jBR/8FFu//9JYRFgXA PO/A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1702674471; x=1703279271; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=bDHNy6mRe16xdviFUOtx/SHX4cJgboHVcJcVFUnLuxc=; b=lbKLJZkPgTY97+Rx/1n9b0FJwUIpO9lwh2aWWSvPb/+i92JZ2kN3HTOLXhZC6M+omG jJicY08Xx20Rx8k2FjtCdU3GHUq/LKi5XScG0kit02IirD4uIMrWk5ro9H6iWxRF3D8j nR38crpcnmeSFJJ1QuZdFo5mcY0KjrryTZJXA1kSFrt8c/OnMKExhLN/4zbJFdDHnAQP /m/3h3KFhCXFstW0TQPCaP0ZbyzHko4oSCO7vIKLu5GaTqK84pBFv94EnoAAJChKN7Wu tyhNvDoerqRbxp9MOU8Qsrw8ykICdsm7MH6JNTYpa6cdWTyNA7CYcY7sPX9JzSnLUtDA 65Xg== X-Gm-Message-State: AOJu0YxhVmYf1RJkq3/XTXYZ4NUnpkm96gfNqzje3XIqw6TqorMbxCLS NcTKhAHSEtqjUw1LLBAd0zMVOjfeD7Z5 X-Received: from hi-h2o-specialist.c.googlers.com ([fda3:e722:ac3:cc00:24:72f4:c0a8:3cef]) (user=arakesh job=sendgmr) by 2002:a17:90b:2243:b0:28a:c111:2119 with SMTP id hk3-20020a17090b224300b0028ac1112119mr1059647pjb.3.1702674471575; Fri, 15 Dec 2023 13:07:51 -0800 (PST) Date: Fri, 15 Dec 2023 13:07:44 -0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.43.0.472.g3155946c3a-goog Message-ID: <20231215210746.821494-1-arakesh@google.com> Subject: [PATCH 1/2] usb: gadget: uvc: Fix use are free during STREAMOFF From: Avichal Rakesh To: dan.scally@ideasonboard.com, gregkh@linuxfoundation.org, laurent.pinchart@ideasonboard.com Cc: etalvala@google.com, jchowdhary@google.com, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, Avichal Rakesh X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1785383608353188011 X-GMAIL-MSGID: 1785383608353188011 There is a path that may lead to freed memory being referenced, and causing kernel panics. The kernel panic has the following stack trace: Workqueue: uvcgadget uvcg_video_pump.c51fb85fece46625450f86adbf92c56c.cfi_jt pstate: 60c00085 (nZCv daIf +PAN +UAO -TCO BTYPE=--) pc : __list_del_entry_valid+0xc0/0xd4 lr : __list_del_entry_valid+0xc0/0xd4 Call trace: __list_del_entry_valid+0xc0/0xd4 uvc_video_free_request+0x60/0x98 uvcg_video_pump+0x1cc/0x204 process_one_work+0x21c/0x4b8 worker_thread+0x29c/0x574 kthread+0x158/0x1b0 ret_from_fork+0x10/0x30 The root cause is that uvcg_video_usb_req_queue frees the uvc_request if is_enabled is false and returns an error status. video_pump also frees the associated request if uvcg_video_usb_req_queue returns an e rror status, leading to double free and accessing garbage memory. To fix the issue, this patch removes freeing logic from uvcg_video_usb_req_queue, and lets the callers to the function handle queueing errors as they see fit. Signed-off-by: Avichal Rakesh --- drivers/usb/gadget/function/uvc_video.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/usb/gadget/function/uvc_video.c b/drivers/usb/gadget/function/uvc_video.c index 98ba524c27f5..e5db1be14ca3 100644 --- a/drivers/usb/gadget/function/uvc_video.c +++ b/drivers/usb/gadget/function/uvc_video.c @@ -277,8 +277,7 @@ static int uvcg_video_usb_req_queue(struct uvc_video *video, struct list_head *list = NULL; if (!video->is_enabled) { - uvc_video_free_request(req->context, video->ep); - return -ENODEV; + return -EINVAL; } if (queue_to_ep) { struct uvc_request *ureq = req->context; @@ -464,8 +463,15 @@ uvc_video_complete(struct usb_ep *ep, struct usb_request *req) * and this thread for isoc endpoints. */ ret = uvcg_video_usb_req_queue(video, to_queue, !is_bulk); - if (ret < 0) + if (ret < 0) { + /* + * Endpoint error, but the stream is still enabled. + * Put request back in req_free for it to be cleaned + * up later. + */ uvcg_queue_cancel(queue, 0); + list_add_tail(&to_queue->list, &video->req_free); + } } else { uvc_video_free_request(ureq, ep); }