From: Dan Carpenter <dan.carpenter@oracle.com> 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=... -------------------------------- commit b535917c51acc97fb0761b1edec85f1f3d02bda4 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: 66898177e7e5 ("staging: rtl8192e: Fix unload/reload problem") Cc: stable <stable@vger.kernel.org> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Link: https://lore.kernel.org/r/20211117072016.GA5237@kili Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Kaixiong Yu <yukaixiong@huawei.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 7cdced0b0581..da73998bc5f7 100644 --- a/drivers/staging/rtl8192e/rtl8192e/rtl_core.c +++ b/drivers/staging/rtl8192e/rtl8192e/rtl_core.c @@ -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); } -- 2.25.1