linux-kernel - [PATCH] staging: r8188eu: Check for null pointer after calling skb

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Message-Id: <20220107080021.4034205-1-jiasheng@iscas.ac.cn>
Date:   Fri,  7 Jan 2022 16:00:21 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     Larry.Finger@...inger.net, phil@...lpotter.co.uk,
        gregkh@...uxfoundation.org, straube.linux@...il.com,
        martin@...ser.cx
Cc:     linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH] staging: r8188eu: Check for null pointer after calling skb_clone

As the possible failure of the allocation, the skb_clone may return NULL
pointer.
Therefore, it may cause the dereference of NULL pointer.
Also, same as rtw_os_recv_indicate_pkt() in
`drivers/staging/rtl8723bs/os_dep/recv_linux.c`, it should be better to
add the check.

Fixes: 2b42bd58b321 ("staging: r8188eu: introduce new os_dep dir for RTL8188eu driver")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
 drivers/staging/r8188eu/os_dep/recv_linux.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/r8188eu/os_dep/recv_linux.c b/drivers/staging/r8188eu/os_dep/recv_linux.c
index 917a63e3e94c..cf40f33f3295 100644
--- a/drivers/staging/r8188eu/os_dep/recv_linux.c
+++ b/drivers/staging/r8188eu/os_dep/recv_linux.c
@@ -151,7 +151,7 @@ int rtw_recv_indicatepkt(struct adapter *padapter,
 
 				rtw_xmit_entry(skb, pnetdev);
 
-				if (bmcast)
+				if (bmcast && pskb2)
 					skb = pskb2;
 				else
 					goto _recv_indicatepkt_end;
-- 
2.25.1