linux-kernel - [PATCH 1/1] ath10k: avoid possible memory access violation

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Message-id: <1533292805-9709-1-git-send-email-vijay.bvb@samsung.com>
Date:   Fri, 03 Aug 2018 16:10:05 +0530
From:   "K.T.VIJAYAKUMAAR" <vijay.bvb@...sung.com>
To:     kvalo@...eaurora.org, davem@...emloft.net,
        ath10k@...ts.infradead.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     cpgs@...sung.com, vijay.bvb@...sung.com
Subject: [PATCH 1/1] ath10k: avoid possible memory access violation

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@...sung.com>
---
 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 877249a..23502cd 100644
--- a/drivers/net/wireless/ath/ath10k/wmi.c
+++ b/drivers/net/wireless/ath/ath10k/wmi.c
@@ -4721,6 +4721,13 @@ ath10k_wmi_tpc_final_get_rate(struct ath10k *ar,
 		}
 	}

+	if (pream == -1) {
+		ath10k_warn(ar, "unknown wmi tpc final: pream_idx[%u], chan_freq[%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]);
-- 
2.7.4