linux-kernel - [PATCH] net: rtl8192c: fix a potential NULL pointer dereference

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Date:   Tue, 12 Mar 2019 02:59:46 -0500
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Ping-Ke Shih <pkshih@...ltek.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Larry Finger <Larry.Finger@...inger.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] net: rtl8192c: fix a potential NULL pointer dereference

In case dev_alloc_skb fails, the fix safely returns to avoid
potential NULL pointer dereference.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/net/wireless/realtek/rtlwifi/rtl8192c/fw_common.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192c/fw_common.c b/drivers/net/wireless/realtek/rtlwifi/rtl8192c/fw_common.c
index 18c76990a089..9042fc044c7e 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8192c/fw_common.c
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192c/fw_common.c
@@ -623,6 +623,9 @@ void rtl92c_set_fw_rsvdpagepkt(struct ieee80211_hw *hw,
 		      u1rsvdpageloc, 3);
 
 	skb = dev_alloc_skb(totalpacketlen);
+	if (!skb)
+		return;
+
 	skb_put_data(skb, &reserved_page_packet, totalpacketlen);
 
 	if (cmd_send_packet)
-- 
2.17.1