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 3A23EC148; Tue, 29 Apr 2025 17:46:34 +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=1745948794; cv=none; b=OBsrzSq4jZhfN/MKb05+u9rDisayN1QKAqhEkMwms59To09frMtazRuQ4NifZ1KK3M0TKG+SOViRyaJOFmYpZaTLDR3cLCFJVVKUrW3FciwdtsVZ2zar2oyqAxgvOJuIGTZ0CSTs6KgUAMqdwssY19HEgRuAthez0zPXTSusWkc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745948794; c=relaxed/simple; bh=cSY+siYeStZUiTZMo1p5DRIrqYqmX1IRzSMPpt5hBhE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=DqlbGSN0IVJ/NMy8nGs0jTLz65/wCYpYils2JRCG6wKR7KmsAgow4GgrDFEmH6o55gHkzql3qGZpDa0DDX8BUYGUrmHdtGscirf8A8rs5DXzUd6vlcOfkqRr4qixdMOK7uaLwWLqR+2abRjsJ0tWFywGIpGtLPN7yiOlIwfGS28= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=2WBWpKNi; 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="2WBWpKNi" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C29D4C4CEE3; Tue, 29 Apr 2025 17:46:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1745948794; bh=cSY+siYeStZUiTZMo1p5DRIrqYqmX1IRzSMPpt5hBhE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=2WBWpKNiWyglFXYJ1PZ9OLsRy0Pg+TnuMlbbx2LCWnLOGUfP1AM4mf876y79eOjcC PSWyXsiRWYosi5HXp2Hs+PZaqnLXZbFMsRuQP/jY9Cgfnkj9HZfzDjpvdUset5+AFa nb5CwFlhl5G1EZoazUYa18BCbvSQslKkkLTafaLQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Kaixin Wang , Andy Shevchenko , Sebastian Reichel Subject: [PATCH 5.15 115/373] HSI: ssi_protocol: Fix use after free vulnerability in ssi_protocol Driver Due to Race Condition Date: Tue, 29 Apr 2025 18:39:52 +0200 Message-ID: <20250429161127.908007749@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250429161123.119104857@linuxfoundation.org> References: <20250429161123.119104857@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Kaixin Wang commit e3f88665a78045fe35c7669d2926b8d97b892c11 upstream. In the ssi_protocol_probe() function, &ssi->work is bound with ssip_xmit_work(), In ssip_pn_setup(), the ssip_pn_xmit() function within the ssip_pn_ops structure is capable of starting the work. If we remove the module which will call ssi_protocol_remove() to make a cleanup, it will free ssi through kfree(ssi), while the work mentioned above will be used. The sequence of operations that may lead to a UAF bug is as follows: CPU0 CPU1 | ssip_xmit_work ssi_protocol_remove | kfree(ssi); | | struct hsi_client *cl = ssi->cl; | // use ssi Fix it by ensuring that the work is canceled before proceeding with the cleanup in ssi_protocol_remove(). Signed-off-by: Kaixin Wang Acked-by: Andy Shevchenko Link: https://lore.kernel.org/r/20240918120749.1730-1-kxwang23@m.fudan.edu.cn Signed-off-by: Sebastian Reichel Signed-off-by: Greg Kroah-Hartman --- drivers/hsi/clients/ssi_protocol.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/hsi/clients/ssi_protocol.c +++ b/drivers/hsi/clients/ssi_protocol.c @@ -403,6 +403,7 @@ static void ssip_reset(struct hsi_client del_timer(&ssi->rx_wd); del_timer(&ssi->tx_wd); del_timer(&ssi->keep_alive); + cancel_work_sync(&ssi->work); ssi->main_state = 0; ssi->send_state = 0; ssi->recv_state = 0;