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From: Dan Carpenter <dan.carpenter@oracle.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: William Durand <will+git@drnd.me>,
	Aditya Srivastava <yashsri421@gmail.com>,
	Saurav Girepunje <saurav.girepunje@gmail.com>,
	Tuo Li <islituo@gmail.com>,
	Larry Finger <Larry.Finger@lwfinger.net>,
	linux-staging@lists.linux.dev, kernel-janitors@vger.kernel.org
Subject: [PATCH] staging: rtl8192e: Fix use after free in _rtl92e_pci_disconnect()
Date: Wed, 17 Nov 2021 10:20:16 +0300	[thread overview]
Message-ID: <20211117072016.GA5237@kili> (raw)

The free_rtllib() function frees the "dev" pointer so there is use
after free on the next line.  Re-arrange things to avoid that.

Fixes: 66898177e7e5 ("staging: rtl8192e: Fix unload/reload problem")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
 drivers/staging/rtl8192e/rtl8192e/rtl_core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/rtl8192e/rtl8192e/rtl_core.c b/drivers/staging/rtl8192e/rtl8192e/rtl_core.c
index d2e9df60e9ba..b9ce71848023 100644
--- a/drivers/staging/rtl8192e/rtl8192e/rtl_core.c
+++ b/drivers/staging/rtl8192e/rtl8192e/rtl_core.c
@@ -2549,13 +2549,14 @@ static void _rtl92e_pci_disconnect(struct pci_dev *pdev)
 			free_irq(dev->irq, dev);
 			priv->irq = 0;
 		}
-		free_rtllib(dev);
 
 		if (dev->mem_start != 0) {
 			iounmap((void __iomem *)dev->mem_start);
 			release_mem_region(pci_resource_start(pdev, 1),
 					pci_resource_len(pdev, 1));
 		}
+
+		free_rtllib(dev);
 	}
 
 	pci_disable_device(pdev);
-- 
2.20.1


                 reply	other threads:[~2021-11-17  7:20 UTC|newest]

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