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=1793802673; b=l8OEpim0RFXFbe9vK1hSXpj7/RnYY7JAjqwTa7uUlCRw3CJdTdOaF/a2HQW0qM3pCIbs 9MbTCMSuXAh6uxY3Jk+ojaj3QJ2kiaIVe/YjzsmDEZXPCtmfsjlXBVoAyOFTujJL0c0w8 RdmHdzt5YywcapRmN+MuGrrnpmlqfAeF3BzaLkWeU6+eBGIUaMGK7W42QijeYOLfpK1zr OtfijQjIoP+3/SbGqhBSnob3q1JEu+i+zYcQiywcgkefXhKqlB3VOyE+Gv2r1Hp2U35ia pSHmvF0ZdDk+k8ullCI+ml2O+6I7gzvq7q6nyfPOosatkh32o242iLayw/CJ+FKRpZg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793802673; h=Received:DKIM-Signature:Subject:To:Cc:From:Date:Message-ID: MIME-Version:Content-Type:Content-Transfer-Encoding; bh=O3Ea0EbSxATq/9MZHAhAHSEyKzuPfl9jT4+rY4C1vao=; b=21ZZPAdwFmWMcp4wZfxOYFQ5f85xmjwr/naUBnYrS1qGlHeZUJ9coeUPkg4kDmcLWvzV I5TzgGZVbyEJY+WHaYfBXTiNEvL9bXDlyuRJAA/lgDFgoENUXXac37oylUNsBu2LQJ8g8 qPR8rGA6+c/bGw6p+6qJzAYxxoTwGCES96c5LGDpkzKuJ9yxIyLpEmdRWGdOsYglMaOt9 eUac4niIFu0r6Un4QaCsz1YGNI0fQVxYa3jBhyOq6zFco/iwsTjGqom0R/In4z7ys/yK8 WvSv/QmAPxAoO3wPFNsXUXfa7/zLClMemO+CABEWMPFvjuoLGd5h+sqAgBEot9XZC1Q== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=K82bEbnL; 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 69482606A31B for ; Wed, 4 Nov 2026 14:31:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=K82bEbnL Received: by smtp.kernel.org (Postfix) with ESMTPSA id 18EE61F000C1; Wed, 4 Nov 2026 14:31:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1793802673; bh=O3Ea0EbSxATq/9MZHAhAHSEyKzuPfl9jT4+rY4C1vao=; h=Subject:To:Cc:From:Date; b=K82bEbnL0pBIF9aAShkddDACdDfDNmYE1U5GlFMTqPgy3Hu7v0yDEiA805g9rxgi8 3Bo/2ml4HhX9/cReL4m1SFMI43cdDzIdFxx+/0Rv4t8fBd594/ON3oA5tYP4B5zXvr Rh7+ut1mSxJES/otaImZiGXsV4nUVbyT863fKHgY= Subject: FAILED: patch "[PATCH] media: rc: Fix race condition during rc_register_device()" failed to apply to 5.15-stable tree To: sean@mess.org,hverkuil+cisco@kernel.org Cc: From: Date: Wed, 04 Nov 2026 15:31:06 +0100 Message-ID: <2026110406-staple-sheet-b1c6@gregkh> X-Mailing-List: stable@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=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x ec7cb49871e5c4f85d57290320c50ee0bae4db84 # git commit -s git send-email --to '' --in-reply-to '2026110406-staple-sheet-b1c6@gregkh' --subject-prefix 'PATCH 5.15.y' 'HEAD^..' Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From ec7cb49871e5c4f85d57290320c50ee0bae4db84 Mon Sep 17 00:00:00 2001 From: Sean Young Date: Fri, 17 Jul 2026 13:36:31 +0100 Subject: [PATCH] media: rc: Fix race condition during rc_register_device() Device drivers can call ir_raw_event_store() or ir_raw_event_handle() right after rc_allocate_device(). This means that while rc_register_device() is being called, those functions can be called from e.g. interrupt handlers. Currently dev->raw is being allocated and populated by ir_raw_event_prepare() which is called from rc_register_device(). This is not done in a safe way, e.g. dev->raw is being set before the raw members are populated. Call ir_raw_event_prepare() from rc_allocate_device() instead. Fixes: a3572c34da8d ("V4L/DVB: ir-core: Add logic to decode IR protocols at the IR core") Signed-off-by: Sean Young Cc: stable@vger.kernel.org Reviewed-by: Hans Verkuil diff --git a/drivers/media/rc/rc-ir-raw.c b/drivers/media/rc/rc-ir-raw.c index ba24c2f22d39..46c50f423798 100644 --- a/drivers/media/rc/rc-ir-raw.c +++ b/drivers/media/rc/rc-ir-raw.c @@ -71,9 +71,6 @@ static int ir_raw_event_thread(void *data) */ int ir_raw_event_store(struct rc_dev *dev, struct ir_raw_event *ev) { - if (!dev->raw) - return -EINVAL; - dev_dbg(&dev->dev, "sample: (%05dus %s)\n", ev->duration, TO_STR(ev->pulse)); @@ -102,9 +99,6 @@ int ir_raw_event_store_edge(struct rc_dev *dev, bool pulse) ktime_t now; struct ir_raw_event ev = {}; - if (!dev->raw) - return -EINVAL; - now = ktime_get(); ev.duration = ktime_to_us(ktime_sub(now, dev->raw->last_event)); ev.pulse = !pulse; @@ -129,9 +123,6 @@ int ir_raw_event_store_with_timeout(struct rc_dev *dev, struct ir_raw_event *ev) ktime_t now; int rc = 0; - if (!dev->raw) - return -EINVAL; - now = ktime_get(); spin_lock(&dev->raw->edge_spinlock); @@ -166,9 +157,6 @@ EXPORT_SYMBOL_GPL(ir_raw_event_store_with_timeout); */ int ir_raw_event_store_with_filter(struct rc_dev *dev, struct ir_raw_event *ev) { - if (!dev->raw) - return -EINVAL; - /* Ignore spaces in idle mode */ if (dev->idle && !ev->pulse) return 0; @@ -200,9 +188,6 @@ EXPORT_SYMBOL_GPL(ir_raw_event_store_with_filter); */ void ir_raw_event_set_idle(struct rc_dev *dev, bool idle) { - if (!dev->raw) - return; - dev_dbg(&dev->dev, "%s idle mode\n", idle ? "enter" : "leave"); if (idle) { @@ -226,7 +211,7 @@ EXPORT_SYMBOL_GPL(ir_raw_event_set_idle); */ void ir_raw_event_handle(struct rc_dev *dev) { - if (!dev->raw || !dev->raw->thread) + if (!dev->raw->thread) return; wake_up_process(dev->raw->thread); @@ -612,9 +597,6 @@ EXPORT_SYMBOL(ir_raw_encode_carrier); */ int ir_raw_event_prepare(struct rc_dev *dev) { - if (!dev) - return -EINVAL; - dev->raw = kzalloc_obj(*dev->raw); if (!dev->raw) return -ENOMEM; diff --git a/drivers/media/rc/rc-main.c b/drivers/media/rc/rc-main.c index dda3479ea3ad..d93e98189c1a 100644 --- a/drivers/media/rc/rc-main.c +++ b/drivers/media/rc/rc-main.c @@ -1701,14 +1701,24 @@ static const struct device_type rc_dev_type = { struct rc_dev *rc_allocate_device(enum rc_driver_type type) { struct rc_dev *dev; + int ret; dev = kzalloc_obj(*dev); if (!dev) return NULL; + if (type == RC_DRIVER_IR_RAW) { + ret = ir_raw_event_prepare(dev); + if (ret < 0) { + kfree(dev); + return NULL; + } + } + if (type != RC_DRIVER_IR_RAW_TX) { dev->input_dev = input_allocate_device(); if (!dev->input_dev) { + ir_raw_event_free(dev); kfree(dev); return NULL; } @@ -1724,6 +1734,7 @@ struct rc_dev *rc_allocate_device(enum rc_driver_type type) spin_lock_init(&dev->rc_map.lock); spin_lock_init(&dev->keylock); } + mutex_init(&dev->lock); dev->dev.type = &rc_dev_type; @@ -1917,12 +1928,6 @@ int rc_register_device(struct rc_dev *dev) dev->sysfs_groups[attr++] = &rc_dev_wakeup_filter_attr_grp; dev->sysfs_groups[attr++] = NULL; - if (dev->driver_type == RC_DRIVER_IR_RAW) { - rc = ir_raw_event_prepare(dev); - if (rc < 0) - goto out_minor; - } - if (dev->driver_type != RC_DRIVER_IR_RAW_TX) { rc = rc_prepare_rx_device(dev); if (rc) @@ -1979,8 +1984,6 @@ out_dev: out_rx_free: ir_free_table(&dev->rc_map); out_raw: - ir_raw_event_free(dev); -out_minor: ida_free(&rc_ida, minor); return rc; }