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

[srinivas . kandagatla]

From: Srinivas Kandagatla <srinivas.kandaga...@linaro.org>

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

Signed-off-by: Srinivas Kandagatla <srinivas.kandaga...@linaro.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