From patchwork Fri May 13 04:41:41 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tzung-Bi Shih X-Patchwork-Id: 12848356 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 A0F6120F4 for ; Fri, 13 May 2022 04:41:59 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6DF92C34117; Fri, 13 May 2022 04:41:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1652416919; bh=Ru+rS0IQ9IXfMCF8DmORHI1hv6atGBSVQdZH07gCx3s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OXLthW4Gp78VNUfhLwiDz4XQ64QoA4Bl0y2nrLm8xMrjnwDaEtbfbGISUwTX/q/hP wh8VNE6O0GJSAARifhoSoajCKj99GZo0K57Ecc/LoylQhcbjOxCOdYgcnVjzI6ehbI PgyKjMF5VQtku0uF0YLVKoJ8YPqKe0KlmIwN9/H8bOJUyzBz1EKN+sUlSTuzxNU6wm L7Emk4+IFI6gxvh3zQpTLhFgnPTqfKyno+a3NvG5LkbxU8ACD2PUtfApEMNMggOQt9 t5RbtBt/KrqnXVX1I1nKEKNDmnOY0Ct6CL8hnty2dEGF7LFBfzWP2fhcxdLkNGo2ZA tYtj11cJny2/Q== From: Tzung-Bi Shih To: bleung@chromium.org, groeck@chromium.org Cc: chrome-platform@lists.linux.dev, tzungbi@kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 5/7] platform/chrome: cros_ec_i2c: drop BUG_ON() in cros_ec_pkt_xfer_i2c() Date: Fri, 13 May 2022 12:41:41 +0800 Message-Id: <20220513044143.1045728-6-tzungbi@kernel.org> X-Mailer: git-send-email 2.36.0.550.gb090851708-goog In-Reply-To: <20220513044143.1045728-1-tzungbi@kernel.org> References: <20220513044143.1045728-1-tzungbi@kernel.org> Precedence: bulk X-Mailing-List: chrome-platform@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 It is overkill to crash the kernel if the given message is oversize. Drop the BUG_ON() and return -EINVAL instead. Reviewed-by: Guenter Roeck Signed-off-by: Tzung-Bi Shih --- Changes from v1: - Add R-b tag. drivers/platform/chrome/cros_ec_i2c.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/platform/chrome/cros_ec_i2c.c b/drivers/platform/chrome/cros_ec_i2c.c index a4f305f1eb0e..9f5b95763173 100644 --- a/drivers/platform/chrome/cros_ec_i2c.c +++ b/drivers/platform/chrome/cros_ec_i2c.c @@ -72,13 +72,19 @@ static int cros_ec_pkt_xfer_i2c(struct cros_ec_device *ec_dev, i2c_msg[1].flags = I2C_M_RD; packet_len = msg->insize + response_header_size; - BUG_ON(packet_len > ec_dev->din_size); + if (packet_len > ec_dev->din_size) { + ret = -EINVAL; + goto done; + } in_buf = ec_dev->din; i2c_msg[1].len = packet_len; i2c_msg[1].buf = (char *) in_buf; packet_len = msg->outsize + request_header_size; - BUG_ON(packet_len > ec_dev->dout_size); + if (packet_len > ec_dev->dout_size) { + ret = -EINVAL; + goto done; + } out_buf = ec_dev->dout; i2c_msg[0].len = packet_len; i2c_msg[0].buf = (char *) out_buf;