From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from extorris.mess.org (extorris.mess.org [92.243.27.206]) (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 82E664C6F16; Wed, 22 Jul 2026 10:23:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=92.243.27.206 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784715826; cv=none; b=MpUxD8Kukc7MaPWBaeownkVHnrcWc0Yb0/FvPkGUnFgqdcgO7TWLBgpUK04VN3PWqvJP2Xytr6k34ySL9vdVP5bjP/DnyXB/lJ3PgvrAGMyeWNsaPD2MMZhg+oc9K+XjegPH519YVOpPa1fh25ChH14xg0RkP/eHKTqUakGu1zg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784715826; c=relaxed/simple; bh=jqslKCSwrVbWt146DlZm+Nc3XR/IkUMq73PIcZIrDNc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ehtp17usVoUp1zQ1BToM47A4p8FiA6LHDm8G8iHLlxiUpqI8gJ3sIjFkUTvRSgoPw/ZcYTlThKui27SpuApWE9FZUazJxyaPqqt1KowA0thYNhmJH7OPGiUB7vbVIIYsQqU7FGbLA3S8ZgxahbAkRD0N69enzGl6KBiFcEZlVys= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=mess.org; spf=pass smtp.mailfrom=mess.org; dkim=pass (2048-bit key) header.d=mess.org header.i=@mess.org header.b=ilI+7aSz; dkim=pass (2048-bit key) header.d=mess.org header.i=@mess.org header.b=Nrq/j9UF; arc=none smtp.client-ip=92.243.27.206 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=mess.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=mess.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=mess.org header.i=@mess.org header.b="ilI+7aSz"; dkim=pass (2048-bit key) header.d=mess.org header.i=@mess.org header.b="Nrq/j9UF" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=mess.org; s=2020; t=1784715823; bh=jqslKCSwrVbWt146DlZm+Nc3XR/IkUMq73PIcZIrDNc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ilI+7aSzRSLWKKNsOaw8puzO+6D5aUGoSIHQ7wHaJEpXJJ3PrZo1HRiBRqgh/gWW2 Kfq5vUVW8MdNi46Ri3Z0A62P92Zw8dM1bV66wiF2Rp61hi6xAcPkelPqUf1b9J8XeL CqLE9Q3Iqh3Prl+A+coMgkAwOnODGKVKeUSq0cMfCVdzJx2nGgkPPV82NVpT1RP+YO Vyd16hiWJOUuVgXIbO3trrkiTnlnzXm/x/NhR29a1iP+m60OGU4R3NKVn/HCxGmXJg 5hrvbTsCS/XzeiXRxzPsY7+hECopZGL9SAc6amD4FqDE5zpU+5Q/zvAM0UM+VBAOzL T6l+9FSUs/Bvg== Received: by extorris.mess.org (Postfix, from userid 1004) id 2700E4253E; Wed, 22 Jul 2026 11:23:43 +0100 (BST) X-Spam-Level: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=mess.org; s=2020; t=1784715821; bh=jqslKCSwrVbWt146DlZm+Nc3XR/IkUMq73PIcZIrDNc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Nrq/j9UFoRv/cQeyhrDZXYKm8rz2y4o9/2aPE0wRbswBsaUpzF5Ov/mvWvty04t9e yvdA/Fv6iCsnI6ch2t5b+1NsjIpYsGpKxPbhsXUfqdElZcWpBk8314tDQVUKhh/tIk 6ImN3iQElVpalIM7lXHx8sQYSlCDn+Prdgnh8XwGPcqpMlPp89kAmISH/dJAYGTirc M/+rq5OuIG4IYJyOKqnFAUJkDSv52jTFerZTbnfOoftDo1eiAnh23L0QX9KsYypHUm gdcfJAho9CsKREVDP2HSIQYtDa1f7FViHFzQEDRZ7NTLFxFPzAEc3Pe+Oe9uwOgQcH J5AjbZM7MhOuQ== Received: from maru.local (unknown [62.232.99.130]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by extorris.mess.org (Postfix) with ESMTPSA id 904A04017A; Wed, 22 Jul 2026 11:23:41 +0100 (BST) From: Sean Young To: linux-media@vger.kernel.org, Sean Young , Mauro Carvalho Chehab , Hans Verkuil , Patrice Chotard Cc: linux-kernel@vger.kernel.org Subject: [PATCH v3 11/13] media: rc: Use after free in ir_raw_event_handle() Date: Wed, 22 Jul 2026 11:23:23 +0100 Message-ID: X-Mailer: git-send-email 2.55.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit If rc_unregister_device() is called while IR is being processed, then ir_raw_event_handle() could call wake_up_process(dev->raw->thread) after kthread_stop(dev->raw->thread). Fixes: dccc0c3ddf8f ("media: rc: fix race between unregister and urb/irq callbacks") Signed-off-by: Sean Young --- drivers/media/rc/rc-ir-raw.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/media/rc/rc-ir-raw.c b/drivers/media/rc/rc-ir-raw.c index ba24c2f22d39..f066176c9f37 100644 --- a/drivers/media/rc/rc-ir-raw.c +++ b/drivers/media/rc/rc-ir-raw.c @@ -637,6 +637,7 @@ int ir_raw_event_register(struct rc_dev *dev) if (IS_ERR(thread)) return PTR_ERR(thread); + get_task_struct(thread); dev->raw->thread = thread; mutex_lock(&ir_raw_handler_lock); @@ -648,8 +649,12 @@ int ir_raw_event_register(struct rc_dev *dev) void ir_raw_event_free(struct rc_dev *dev) { - kfree(dev->raw); - dev->raw = NULL; + if (dev->raw) { + if (dev->raw->thread) + put_task_struct(dev->raw->thread); + kfree(dev->raw); + dev->raw = NULL; + } } void ir_raw_event_unregister(struct rc_dev *dev) -- 2.55.0