linux-kernel - [PATCH] rtlwifi: rtl8822b: fix a missing check of alloc

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Message-Id: <20181222225809.63015-1-kjlu@umn.edu>
Date:   Sat, 22 Dec 2018 16:58:06 -0600
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sabin Mihai Rapan <sabin.rapan@...il.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: [PATCH] rtlwifi: rtl8822b: fix a missing check of alloc_skb

__netdev_alloc_skb() return NULl when it fails. skb_put() further uses
it even when the allocation fails, leading to NULL pointer dereference.
The fix inserts a check for the return value of __netdev_alloc_skb().

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/staging/rtlwifi/rtl8822be/fw.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/staging/rtlwifi/rtl8822be/fw.c b/drivers/staging/rtlwifi/rtl8822be/fw.c
index a40396614814..f061dd1382aa 100644
--- a/drivers/staging/rtlwifi/rtl8822be/fw.c
+++ b/drivers/staging/rtlwifi/rtl8822be/fw.c
@@ -486,6 +486,8 @@ bool rtl8822b_halmac_cb_write_data_h2c(struct rtl_priv *rtlpriv, u8 *buf,
 
 	/* without GFP_DMA, pci_map_single() may not work */
 	skb = __netdev_alloc_skb(NULL, size, GFP_ATOMIC | GFP_DMA);
+	if (!skb)
+		return false;
 	memcpy((u8 *)skb_put(skb, size), buf, size);
 
 	return _rtl8822be_send_bcn_or_cmd_packet(rtlpriv->hw, skb, H2C_QUEUE);
-- 
2.17.2 (Apple Git-113)