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Tue, 13 Dec 2022 06:36:02 -0800 (PST) Received: from alco.roam.corp.google.com ([100.104.168.209]) by smtp.gmail.com with ESMTPSA id kv17-20020a17090778d100b00781dbdb292asm4613960ejc.155.2022.12.13.06.36.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 13 Dec 2022 06:36:02 -0800 (PST) From: Ricardo Ribalda Date: Tue, 13 Dec 2022 15:35:30 +0100 Subject: [PATCH v2 1/2] media: uvcvideo: Fix race condition with usb_kill_urb MIME-Version: 1.0 Message-Id: <20221212-uvc-race-v2-1-54496cc3b8ab@chromium.org> References: <20221212-uvc-race-v2-0-54496cc3b8ab@chromium.org> In-Reply-To: <20221212-uvc-race-v2-0-54496cc3b8ab@chromium.org> To: Max Staudt , Sergey Senozhatsky , Yunke Cao , Laurent Pinchart , Mauro Carvalho Chehab Cc: linux-media@vger.kernel.org, stable@vger.kernel.org, linux-kernel@vger.kernel.org, Ricardo Ribalda X-Mailer: b4 0.11.0-dev-696ae X-Developer-Signature: v=1; a=openpgp-sha256; l=3069; i=ribalda@chromium.org; h=from:subject:message-id; bh=6kvmCn7eEeTM0+R88QPjF6t0UZo7MMe7Xr8f2IbHo6E=; 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For UVC, the function uvc_ctrl_status_event_async() takes care of control changes asynchronously. If the code is executed in the following order: CPU 0 CPU 1 ===== ===== uvc_status_complete() uvc_status_stop() uvc_ctrl_status_event_work() uvc_status_start() -> FAIL Then uvc_status_start will keep failing and this error will be shown: <4>[ 5.540139] URB 0000000000000000 submitted while active drivers/usb/core/urb.c:378 usb_submit_urb+0x4c3/0x528 Let's improve the current situation, by not re-submiting the urb if we are stopping the status event. Also process the queued work (if any) during stop. CPU 0 CPU 1 ===== ===== uvc_status_complete() uvc_status_stop() uvc_status_start() uvc_ctrl_status_event_work() -> FAIL Hopefully, with the usb layer protection this should be enough to cover all the cases. Cc: stable@vger.kernel.org Fixes: e5225c820c05 ("media: uvcvideo: Send a control event when a Control Change interrupt arrives") Signed-off-by: Ricardo Ribalda Reviewed-by: Yunke Cao --- drivers/media/usb/uvc/uvc_ctrl.c | 3 +++ drivers/media/usb/uvc/uvc_status.c | 6 ++++++ drivers/media/usb/uvc/uvcvideo.h | 1 + 3 files changed, 10 insertions(+) diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c index c95a2229f4fa..5160facc8e20 100644 --- a/drivers/media/usb/uvc/uvc_ctrl.c +++ b/drivers/media/usb/uvc/uvc_ctrl.c @@ -1442,6 +1442,9 @@ static void uvc_ctrl_status_event_work(struct work_struct *work) uvc_ctrl_status_event(w->chain, w->ctrl, w->data); + if (dev->flush_status) + return; + /* Resubmit the URB. */ w->urb->interval = dev->int_ep->desc.bInterval; ret = usb_submit_urb(w->urb, GFP_KERNEL); diff --git a/drivers/media/usb/uvc/uvc_status.c b/drivers/media/usb/uvc/uvc_status.c index 7518ffce22ed..09a5802dc974 100644 --- a/drivers/media/usb/uvc/uvc_status.c +++ b/drivers/media/usb/uvc/uvc_status.c @@ -304,10 +304,16 @@ int uvc_status_start(struct uvc_device *dev, gfp_t flags) if (dev->int_urb == NULL) return 0; + dev->flush_status = false; return usb_submit_urb(dev->int_urb, flags); } void uvc_status_stop(struct uvc_device *dev) { + struct uvc_ctrl_work *w = &dev->async_ctrl; + + dev->flush_status = true; usb_kill_urb(dev->int_urb); + if (cancel_work_sync(&w->work)) + uvc_ctrl_status_event(w->chain, w->ctrl, w->data); } diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h index df93db259312..6a9b72d6789e 100644 --- a/drivers/media/usb/uvc/uvcvideo.h +++ b/drivers/media/usb/uvc/uvcvideo.h @@ -560,6 +560,7 @@ struct uvc_device { struct usb_host_endpoint *int_ep; struct urb *int_urb; u8 *status; + bool flush_status; struct input_dev *input; char input_phys[64]; From patchwork Tue Dec 13 14:35:31 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ricardo Ribalda X-Patchwork-Id: 32844 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:adf:e747:0:0:0:0:0 with SMTP id c7csp158277wrn; Tue, 13 Dec 2022 06:38:11 -0800 (PST) X-Google-Smtp-Source: AA0mqf5FdSpnH6nqQrnT7es8VcyfksgIXTDfyU2JD3o7VYKxw1pSFbXSxCXCadYXOqbvB+Oo98fd X-Received: by 2002:a17:90a:d24f:b0:219:251f:d92d with SMTP id o15-20020a17090ad24f00b00219251fd92dmr21069825pjw.9.1670942291298; Tue, 13 Dec 2022 06:38:11 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1670942291; cv=none; d=google.com; s=arc-20160816; b=VK/qMaD8oSi0Scj60ONVdUa+7FR45RB/RH8n3qiGLecAorDUKdgqfU8H7C5XLINtHs 1KtWeuis7Wv6FSt/DvaWwGr4hwCv7qW36UAScQFzDztHLxv1nNk3qhGabL2LH3LuDimz 5/iZZcvLWDcehcsjOqZ+5iHHXJDSHB+kwIgjJy0DTbyr7Wsysg/kmucwgf8OQP+Seuag 6/3olgWVTfZCgn5/e93sprC38AErO0UNkZQXqW1+l4GJvfO+VxoefzAT0WSBG7uhb1SK qxcx0/nf1ddTUgm81NGkmp8R8L3VfR9GtEXiD3bNgp7s+INn3wvikAXt90/hoWpnI+Q8 3ksg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:cc:to:in-reply-to:references:message-id :content-transfer-encoding:mime-version:subject:date:from :dkim-signature; bh=LoBGLUjEyhQfXWIWPOu9C92qTSNRy93bFCVJA1Gy7YQ=; b=pcA/Avs+i2wno5R07MsDiiHC6h7pu4XDMyTPKuqSnKNFc1EOzi42SbNzC7JEvN/eNf QDQIwaDd3T7fWsNxrno1jltXR+K9qlCCon7dUp+b+4M94+O4kwHnAgGW5Gf9fKQzAHwO UjRiXkuXBp/QdkLSWOzuaJFF9uecOfcWoJX0dX0anPTQdB8F3eG4KT/1PnEa2XwlmBxh 9E3gYW1BVmZQwE7XzMAuQuWRnoo0Defx4Airf9lB5q32bqpSBwLSVTyHwoFrpn3IUYr+ CQmjtCWGeoHeoySwX8C+/GEyMWb4GiC1VWEPpLa6w8B6rescsRp5JZMmfuWl6rHz68qt ++wQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@chromium.org header.s=google header.b=A9+F+Qfs; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=chromium.org Received: from out1.vger.email (out1.vger.email. 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Tue, 13 Dec 2022 06:36:03 -0800 (PST) Received: from alco.roam.corp.google.com ([100.104.168.209]) by smtp.gmail.com with ESMTPSA id kv17-20020a17090778d100b00781dbdb292asm4613960ejc.155.2022.12.13.06.36.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 13 Dec 2022 06:36:03 -0800 (PST) From: Ricardo Ribalda Date: Tue, 13 Dec 2022 15:35:31 +0100 Subject: [PATCH v2 2/2] media: uvcvideo: Do not alloc dev->status MIME-Version: 1.0 Message-Id: <20221212-uvc-race-v2-2-54496cc3b8ab@chromium.org> References: <20221212-uvc-race-v2-0-54496cc3b8ab@chromium.org> In-Reply-To: <20221212-uvc-race-v2-0-54496cc3b8ab@chromium.org> To: Max Staudt , Sergey Senozhatsky , Yunke Cao , Laurent Pinchart , Mauro Carvalho Chehab Cc: linux-media@vger.kernel.org, stable@vger.kernel.org, linux-kernel@vger.kernel.org, Ricardo Ribalda X-Mailer: b4 0.11.0-dev-696ae X-Developer-Signature: v=1; a=openpgp-sha256; l=1689; i=ribalda@chromium.org; h=from:subject:message-id; bh=jEDQuOW3z7ZGcsKin4RTBJvSelqdlHZ1geiYjpdBLTo=; 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Signed-off-by: Ricardo Ribalda --- drivers/media/usb/uvc/uvc_status.c | 9 +-------- drivers/media/usb/uvc/uvcvideo.h | 2 +- 2 files changed, 2 insertions(+), 9 deletions(-) diff --git a/drivers/media/usb/uvc/uvc_status.c b/drivers/media/usb/uvc/uvc_status.c index 09a5802dc974..52999b3b7c48 100644 --- a/drivers/media/usb/uvc/uvc_status.c +++ b/drivers/media/usb/uvc/uvc_status.c @@ -259,15 +259,9 @@ int uvc_status_init(struct uvc_device *dev) uvc_input_init(dev); - dev->status = kzalloc(UVC_MAX_STATUS_SIZE, GFP_KERNEL); - if (dev->status == NULL) - return -ENOMEM; - dev->int_urb = usb_alloc_urb(0, GFP_KERNEL); - if (dev->int_urb == NULL) { - kfree(dev->status); + if (!dev->int_urb) return -ENOMEM; - } pipe = usb_rcvintpipe(dev->udev, ep->desc.bEndpointAddress); @@ -296,7 +290,6 @@ void uvc_status_unregister(struct uvc_device *dev) void uvc_status_cleanup(struct uvc_device *dev) { usb_free_urb(dev->int_urb); - kfree(dev->status); } int uvc_status_start(struct uvc_device *dev, gfp_t flags) diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h index 6a9b72d6789e..ccc7e3b60bf1 100644 --- a/drivers/media/usb/uvc/uvcvideo.h +++ b/drivers/media/usb/uvc/uvcvideo.h @@ -559,7 +559,7 @@ struct uvc_device { /* Status Interrupt Endpoint */ struct usb_host_endpoint *int_ep; struct urb *int_urb; - u8 *status; + u8 status[UVC_MAX_STATUS_SIZE]; bool flush_status; struct input_dev *input; char input_phys[64];