linux-kernel - [PATCH Linux-next] ioctl_linux: fix a potential NULL pointer dereference bug

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Date:   Sun, 22 Aug 2021 20:06:31 -0700
From:   cgel.zte@...il.com
To:     gregkh@...uxfoundation.org
Cc:     linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        xu xin <xu.xin16@....com.cn>, Zeal Robot <zealci@....com.cn>
Subject: [PATCH Linux-next] ioctl_linux: fix a potential NULL pointer dereference bug

From: xu xin <xu.xin16@....com.cn>

The pointer might be NULL, but it is dereferenced.

Reported-by: Zeal Robot <zealci@....com.cn>
Signed-off-by: xu xin <xu.xin16@....com.cn>
---
 drivers/staging/r8188eu/os_dep/ioctl_linux.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/r8188eu/os_dep/ioctl_linux.c b/drivers/staging/r8188eu/os_dep/ioctl_linux.c
index a3e6d761e748..ce4ce9190f5f 100644
--- a/drivers/staging/r8188eu/os_dep/ioctl_linux.c
+++ b/drivers/staging/r8188eu/os_dep/ioctl_linux.c
@@ -4389,7 +4389,8 @@ static int rtw_dbg_port(struct net_device *dev,
 				pregpriv->rx_stbc = extra_arg;
 				DBG_88E("set rx_stbc =%d\n", pregpriv->rx_stbc);
 			} else {
-				DBG_88E("get rx_stbc =%d\n", pregpriv->rx_stbc);
+				if (pregpriv)
+					DBG_88E("get rx_stbc =%d\n", pregpriv->rx_stbc);
 			}
 		}
 			break;
@@ -4401,7 +4402,8 @@ static int rtw_dbg_port(struct net_device *dev,
 				pregpriv->ampdu_enable = extra_arg;
 				DBG_88E("set ampdu_enable =%d\n", pregpriv->ampdu_enable);
 			} else {
-				DBG_88E("get ampdu_enable =%d\n", pregpriv->ampdu_enable);
+				if (pregpriv)
+					DBG_88E("get ampdu_enable =%d\n", pregpriv->ampdu_enable);
 			}
 		}
 			break;
-- 
2.25.1