linux-kernel - [PATCH 4/7] slimbus: ngd: validate logical address assigned by remote

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Date:   Sun, 16 Sep 2018 16:45:43 -0700
From:   srinivas.kandagatla@...aro.org
To:     gregkh@...uxfoundation.org
Cc:     broonie@...nel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, alsa-devel@...a-project.org,
        vkoul@...nel.org,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH 4/7] slimbus: ngd: validate logical address assigned by remote

From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>

Validate logical address assigned by remote, in failure cases this value
is all zeors.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 drivers/slimbus/qcom-ngd-ctrl.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/slimbus/qcom-ngd-ctrl.c b/drivers/slimbus/qcom-ngd-ctrl.c
index 8be4d67..b9f2e3f 100644
--- a/drivers/slimbus/qcom-ngd-ctrl.c
+++ b/drivers/slimbus/qcom-ngd-ctrl.c
@@ -1004,6 +1004,7 @@ static int qcom_slim_ngd_get_laddr(struct slim_controller *ctrl,
 				   struct slim_eaddr *ea, u8 *laddr)
 {
 	struct slim_val_inf msg =  {0};
+	u8 failed_ea[6] = {0, 0, 0, 0, 0, 0};
 	struct slim_msg_txn txn;
 	u8 wbuf[10] = {0};
 	u8 rbuf[10] = {0};
@@ -1034,6 +1035,9 @@ static int qcom_slim_ngd_get_laddr(struct slim_controller *ctrl,
 		return ret;
 	}
 
+	if (!memcmp(rbuf, failed_ea, 6))
+		return -ENXIO;
+
 	*laddr = rbuf[6];
 
 	return ret;
-- 
2.9.3