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 8B6F81863 for ; Wed, 28 Dec 2022 15:21:27 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 119BAC433D2; Wed, 28 Dec 2022 15:21:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1672240887; bh=iOnKgnpLiisyLkJcXxs/tBEg9qzO+wCqirrBoqs5nbQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=s3FeOBMehRchsaDC6DkUTQ/SZKjZLl7r1Ik/2/lQVElHvsZiPO3MPKmyUOxf8vEVp xFk3S+gDHPyqjq9JdqvsPHM+BXdZ8P6mUoyh8iJVL9QTo7jBzgxt730QuTWt1tjpRz Nvggnrd+B2a5G5FSDSNaoLBL1y83YBT9mNGJFsfc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, CoolStar , Cezary Rojewski , Mark Brown , Sasha Levin Subject: [PATCH 6.0 0214/1073] ASoC: Intel: avs: Fix potential RX buffer overflow Date: Wed, 28 Dec 2022 15:30:02 +0100 Message-Id: <20221228144333.829698496@linuxfoundation.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20221228144328.162723588@linuxfoundation.org> References: <20221228144328.162723588@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Cezary Rojewski [ Upstream commit 23ae34e033b2c0e5e88237af82b163b296fd6aa9 ] If an event caused firmware to return invalid RX size for LARGE_CONFIG_GET, memcpy_fromio() could end up copying too many bytes. Fix by utilizing min_t(). Reported-by: CoolStar Fixes: f14a1c5a9f83 ("ASoC: Intel: avs: Add module management requests") Signed-off-by: Cezary Rojewski Link: https://lore.kernel.org/r/20221010121955.718168-3-cezary.rojewski@intel.com Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- sound/soc/intel/avs/ipc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/sound/soc/intel/avs/ipc.c b/sound/soc/intel/avs/ipc.c index 020d85c7520d..77da206f7dbb 100644 --- a/sound/soc/intel/avs/ipc.c +++ b/sound/soc/intel/avs/ipc.c @@ -192,7 +192,8 @@ static void avs_dsp_receive_rx(struct avs_dev *adev, u64 header) /* update size in case of LARGE_CONFIG_GET */ if (msg.msg_target == AVS_MOD_MSG && msg.global_msg_type == AVS_MOD_LARGE_CONFIG_GET) - ipc->rx.size = msg.ext.large_config.data_off_size; + ipc->rx.size = min_t(u32, AVS_MAILBOX_SIZE, + msg.ext.large_config.data_off_size); memcpy_fromio(ipc->rx.data, avs_uplink_addr(adev), ipc->rx.size); trace_avs_msg_payload(ipc->rx.data, ipc->rx.size); -- 2.35.1