Commit 04ffdbcd authored by Dan Carpenter's avatar Dan Carpenter Committed by Kaixiong Yu
Browse files

staging: rtl8192e: Fix use after free in _rtl92e_pci_disconnect() 

stable inclusion
from stable-v4.19.219
commit bca19bb2dc2d89ce60c4a4a6e59609d4cf2e13ef
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9S27V
CVE: CVE-2021-47571

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=bca19bb2dc2d89ce60c4a4a6e59609d4cf2e13ef



--------------------------------

commit b535917c upstream.

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: 66898177 ("staging: rtl8192e: Fix unload/reload problem")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20211117072016.GA5237@kili


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarKaixiong Yu <yukaixiong@huawei.com>
parent a0395933

drivers/staging/rtl8192e/rtl8192e/rtl_core.c

+2 −1
Original line number Diff line number Diff line
@@ -2579,13 +2579,14 @@ 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);

	} else {

		priv = rtllib_priv(dev);

	}