From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 86C951A9B58; Thu, 27 Nov 2025 14:47:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764254873; cv=none; b=rinobzdL67trGcJvUwRUiqDCYBBKdziPOXvWocmzjcqsv0rrAvIElMQqlkeyA4YPR+vE67z9cXYqW0nrhPN3RB/NQ8JydGgCCk7zXbRmWQ2fMDUro56jbOsVIxd6yKHL+nqsQgCM98Cub/ud9OBHOUpb5FQWTk0m6h5fNxJfynA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764254873; c=relaxed/simple; bh=8ZZjcpdBrh1xE2e6Z0D+c8jm1uYr4z6w/2pROhbWz4E=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=jQriZsCIWvXHWfxoVxiMqHIRyFKUJjGYdO43YU2VltDMj7gjzrHb7K/x5qTpOJP7CPkxHXuKn3WxQfQiV939i8FUnRdx2vyDabLnzkZO1I0daGl2L4HAKuTUmhvRsDy4s1JLbTLtjoRq0ag/2O8FZ4/JlUF75bDerikZ6s8+170= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=VOyAK8lh; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="VOyAK8lh" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 11D84C116C6; Thu, 27 Nov 2025 14:47:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1764254873; bh=8ZZjcpdBrh1xE2e6Z0D+c8jm1uYr4z6w/2pROhbWz4E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VOyAK8lhDG4SGt3Th9nrtDEoDe2ADnmM4iHE7RBDuxFwRg6Uuq5ahhZIht/L24aos Wwv2J5VioM2LSuNCBjk9ut/2CsN+lon/EoxziRDjk7NZr5YJ3JZ4S0uZZ0FOVj3cIX AR0JAz/oTRad8z4EhAdVBrB8U4DdZB4Q8Uiz/YzM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Tzung-Bi Shih , Dmitry Torokhov Subject: [PATCH 6.6 16/86] Input: cros_ec_keyb - fix an invalid memory access Date: Thu, 27 Nov 2025 15:45:32 +0100 Message-ID: <20251127144028.409651883@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20251127144027.800761504@linuxfoundation.org> References: <20251127144027.800761504@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 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Tzung-Bi Shih commit e08969c4d65ac31297fcb4d31d4808c789152f68 upstream. If cros_ec_keyb_register_matrix() isn't called (due to `buttons_switches_only`) in cros_ec_keyb_probe(), `ckdev->idev` remains NULL. An invalid memory access is observed in cros_ec_keyb_process() when receiving an EC_MKBP_EVENT_KEY_MATRIX event in cros_ec_keyb_work() in such case. Unable to handle kernel read from unreadable memory at virtual address 0000000000000028 ... x3 : 0000000000000000 x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: input_event cros_ec_keyb_work blocking_notifier_call_chain ec_irq_thread It's still unknown about why the kernel receives such malformed event, in any cases, the kernel shouldn't access `ckdev->idev` and friends if the driver doesn't intend to initialize them. Signed-off-by: Tzung-Bi Shih Link: https://patch.msgid.link/20251104070310.3212712-1-tzungbi@kernel.org Cc: stable@vger.kernel.org Signed-off-by: Dmitry Torokhov Signed-off-by: Greg Kroah-Hartman --- drivers/input/keyboard/cros_ec_keyb.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/drivers/input/keyboard/cros_ec_keyb.c +++ b/drivers/input/keyboard/cros_ec_keyb.c @@ -263,6 +263,12 @@ static int cros_ec_keyb_work(struct noti case EC_MKBP_EVENT_KEY_MATRIX: pm_wakeup_event(ckdev->dev, 0); + if (!ckdev->idev) { + dev_warn_once(ckdev->dev, + "Unexpected key matrix event\n"); + return NOTIFY_OK; + } + if (ckdev->ec->event_size != ckdev->cols) { dev_err(ckdev->dev, "Discarded incomplete key matrix event.\n");