linux-kernel - [PATCH] rsi: Fix NULL pointer dereference in kmalloc

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Date:   Sat,  2 Mar 2019 14:31:22 -0600
From:   Aditya Pakki <pakki001@....edu>
To:     pakki001@....edu
Cc:     kjlu@....edu, Amitkumar Karwar <amitkarwar@...il.com>,
        Siva Rebbagondla <siva8118@...il.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] rsi: Fix NULL pointer dereference in kmalloc

kmalloc can fail in rsi_register_rates_channels but memcpy still attempts
to write to channels. The patch checks and avoids such a situation.

Signed-off-by: Aditya Pakki <pakki001@....edu>
---
 drivers/net/wireless/rsi/rsi_91x_mac80211.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/net/wireless/rsi/rsi_91x_mac80211.c b/drivers/net/wireless/rsi/rsi_91x_mac80211.c
index e56fc83faf0e..59eb1f533d0e 100644
--- a/drivers/net/wireless/rsi/rsi_91x_mac80211.c
+++ b/drivers/net/wireless/rsi/rsi_91x_mac80211.c
@@ -197,6 +197,11 @@ static void rsi_register_rates_channels(struct rsi_hw *adapter, int band)
 
 	if (band == NL80211_BAND_2GHZ) {
 		channels = kmalloc(sizeof(rsi_2ghz_channels), GFP_KERNEL);
+		if (!channels) {
+			rsi_dbg(ERR_ZONE, "Failed to allocate memory\n");
+			return;
+		}
+
 		memcpy(channels,
 		       rsi_2ghz_channels,
 		       sizeof(rsi_2ghz_channels));
@@ -206,6 +211,11 @@ static void rsi_register_rates_channels(struct rsi_hw *adapter, int band)
 		sbands->n_bitrates = ARRAY_SIZE(rsi_rates);
 	} else {
 		channels = kmalloc(sizeof(rsi_5ghz_channels), GFP_KERNEL);
+		if (!channels) {
+			rsi_dbg(ERR_ZONE, "Failed to allocate memory\n");
+			return;
+		}
+
 		memcpy(channels,
 		       rsi_5ghz_channels,
 		       sizeof(rsi_5ghz_channels));
-- 
2.17.1