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 1777F3AEF51; Sat, 12 Sep 2026 12:06:34 +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=1789214795; cv=none; b=WR5a+wZAHQNJVQZs9dHCq3ngdx+jiTXX+2hl2SG1Pv2LWghlXGQA7fuJ7CS8zTGmTErvH6mJ1wg7EQGTErqcPAu2phz6C+uIEGaAH1UbNqMcSeT36/d7KZ/nl5ZIXp8LgjdRR5HqUL7IyZ4RRFMrLyju3uc15xnTdCY8BbQVn+E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789214795; c=relaxed/simple; bh=dng9QUF3N03j63hTH6qB1J+yW/oHxhOsa+WqRGVLfcs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ENP3IEwSGfoVd7QItFGDLl382L3Jss9nbSqXreeTpsNl0AoSSPKagPUGyoVPi/pavy4arCbsFJHRO1gACQ72Nx4IHt73ATAeA6JaiaJy7Yo3iJxTCJZ24vDsFbyh091tbBt3wPQ9Ix/6YyEMQFP6mGWQirkwqr29NiiY2L8ciCk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=gLXCniJZ; 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="gLXCniJZ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D73721F000FF; Sat, 12 Sep 2026 12:06:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789214794; bh=C3QaKSXPIPQz7y36u/t/iH/pfj6y+G2yrfNbzUH9aAk=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=gLXCniJZoQeopfaIrc/7IBeXiKCDJr8bnP5UD5+s0QgKZtDeoEbT/sSN1k6vWifnK NBeX52MqbW83plVSdJIf0nnyRjXwCJw82u7psR+s4fY2qjbaFzpKViMFtbBy1dj964 tiRcZFeNl4LNdq2ZkVgGJENJjE8uPWE9JJ4uklK4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Manos Pitsidianakis , Herbert Xu , Sasha Levin Subject: [PATCH 6.12 0399/1376] hwrng: core - fix rng list on registration error Date: Sat, 12 Sep 2026 08:47:05 +0200 Message-ID: <20260912065616.436592794@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065607.535295758@linuxfoundation.org> References: <20260912065607.535295758@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 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Manos Pitsidianakis [ Upstream commit 3a5834db2b1ce25649f330e78efe1ccde78967fd ] hwrng_register(rng) does the following: 1. Checks if rng has name and read methods set 2. Checks if the name already exists 3. Adds rng to global rng_list 4. May try to set rng to current_rng If step 4 fails, it returns an error. However, it does not remove the rng from rng_list, causing a dangling reference which can result in use-after-free if the caller frees rng, since registration failed. Add a list_del_init() cleanup step. Fixes: 2bbb6983887f ("hwrng: use rng source with best quality") Signed-off-by: Manos Pitsidianakis Signed-off-by: Herbert Xu Signed-off-by: Sasha Levin --- drivers/char/hw_random/core.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c index c6e913497e1df..008f81a82131d 100644 --- a/drivers/char/hw_random/core.c +++ b/drivers/char/hw_random/core.c @@ -597,11 +597,13 @@ int hwrng_register(struct hwrng *rng) */ err = set_current_rng(rng); if (err) - goto out_unlock; + goto out_list_del; } } mutex_unlock(&rng_mutex); return 0; +out_list_del: + list_del_init(&rng->list); out_unlock: mutex_unlock(&rng_mutex); out: -- 2.53.0