linux-kernel - [PATCH] staging: rtl8192e: rtl_core: Fix possible null-pointer dereference in _rtl92e_pci

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Message-Id: <20210811031135.4110-1-islituo@gmail.com>
Date:   Tue, 10 Aug 2021 20:11:35 -0700
From:   Tuo Li <islituo@...il.com>
To:     gregkh@...uxfoundation.org, dan.carpenter@...cle.com,
        will+git@...d.me, romain.perier@...il.com, yashsri421@...il.com,
        apais@...ux.microsoft.com
Cc:     linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        baijiaju1990@...il.com, Tuo Li <islituo@...il.com>,
        TOTE Robot <oslab@...nghua.edu.cn>
Subject: [PATCH] staging: rtl8192e: rtl_core: Fix possible null-pointer dereference in _rtl92e_pci_disconnect()

The variable dev is checked in:
  if (dev)

This indicates that it can be NULL. If so, a null-pointer dereference will 
occur:
  priv = rtllib_priv(dev);

However, the value of priv is not used in the remaining part of this 
function. Thus the else-branch can be removed to fix this posible 
null-pointer dereference.

Reported-by: TOTE Robot <oslab@...nghua.edu.cn>
Signed-off-by: Tuo Li <islituo@...il.com>
---
 drivers/staging/rtl8192e/rtl8192e/rtl_core.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/staging/rtl8192e/rtl8192e/rtl_core.c b/drivers/staging/rtl8192e/rtl8192e/rtl_core.c
index e85d9c2cdc96..0eb37a95b519 100644
--- a/drivers/staging/rtl8192e/rtl8192e/rtl_core.c
+++ b/drivers/staging/rtl8192e/rtl8192e/rtl_core.c
@@ -2557,8 +2557,6 @@ static void _rtl92e_pci_disconnect(struct pci_dev *pdev)
 			release_mem_region(pci_resource_start(pdev, 1),
 					pci_resource_len(pdev, 1));
 		}
-	} else {
-		priv = rtllib_priv(dev);
 	}
 
 	pci_disable_device(pdev);
-- 
2.25.1