From 97c69a70dc2cecb2c3b96a66529e0082dabc2d2c Mon Sep 17 00:00:00 2001
From: "K.T.VIJAYAKUMAAR" <vijay.bvb@samsung.com>
Date: Mon, 3 Sep 2018 20:07:44 +0300
Subject: [PATCH] ath10k: avoid possible memory access violation
Git-commit: 97c69a70dc2cecb2c3b96a66529e0082dabc2d2c
Patch-mainline: v4.20-rc1
References: bsc#1111666

array "ctl_power_table" access index "pream" is initialized with -1 and
is raised as a static analysis tool issue.
[drivers\net\wireless\ath\ath10k\wmi.c:4719] ->
[drivers\net\wireless\ath\ath10k\wmi.c:4730]: (error) Array index -1 is
out of bounds.

Since the "pream" index for accessing ctl_power_table array is initialized
with -1, there is a chance of memory access violation for the cases below.
1) wmi_pdev_tpc_final_table_event change frequency is between 2483 and 5180
2) pream_idx is out of the enumeration ranges of wmi_tpc_pream_2ghz,
wmi_tpc_pream_5ghz

Signed-off-by: K.T.VIJAYAKUMAAR <vijay.bvb@samsung.com>
[kvalo@codeaurora.org: clean up the warning message]
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/net/wireless/ath/ath10k/wmi.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/wireless/ath/ath10k/wmi.c b/drivers/net/wireless/ath/ath10k/wmi.c
index 212005cd0646..43daa4e57bc1 100644
--- a/drivers/net/wireless/ath/ath10k/wmi.c
+++ b/drivers/net/wireless/ath/ath10k/wmi.c
@@ -4780,6 +4780,13 @@ ath10k_wmi_tpc_final_get_rate(struct ath10k *ar,
 		}
 	}
 
+	if (pream == -1) {
+		ath10k_warn(ar, "unknown wmi tpc final index and frequency: %u, %u\n",
+			    pream_idx, __le32_to_cpu(ev->chan_freq));
+		tpc = 0;
+		goto out;
+	}
+
 	if (pream == 4)
 		tpc = min_t(u8, ev->rates_array[rate_idx],
 			    ev->max_reg_allow_pow[ch]);
-- 
2.16.4