From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ej1-f51.google.com (mail-ej1-f51.google.com [209.85.218.51]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6D1E172 for ; Wed, 21 Jul 2021 19:34:32 +0000 (UTC) Received: by mail-ej1-f51.google.com with SMTP id gb6so4922590ejc.5 for ; Wed, 21 Jul 2021 12:34:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=xZ0ej/xlqgZRChvPE6flzxwaHipob78lAAQBtqKCFyk=; b=iGTLXypEwA0xgrrWmhC0QTc5++cVg7UBLLk18t7uJqEVSAWTDZk2sJtvMRo9LNzULz /CbbTRChxHkQOZfZFDRegnuAlTu7lCXhxvgQ2Y9OKYOMUCV0odQJQCZ+YjHis59np+qR goC79xS7n6BEIgLEBYtaA/Xc7Gmt4QjIjTa+0sTGr2jwSKdyMfoxs0/nTzlP7MYkLKHe MeZFkyzo63c/NTG47+alUDS+xKtdeacMskKamRsvY7Bpthpa55GkMhLYAvRryrOOeNH7 /fa+tiw1iXVGnXHI8ogVsuppOhmHLmU5n9adm/Mt0P7Bwn9rUJgvT/9ZkTbHPpO2mmjL i93A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=xZ0ej/xlqgZRChvPE6flzxwaHipob78lAAQBtqKCFyk=; b=hdngRJ5DU9rNz30XLGbaH91t8qAuSrXzAHXi149ENw3rNKcRJZ1cTv0MvY0nxB4zq6 Xy2GzZFJgrhgc8ECtFe7VCQgBBu2YzGr/9FNHO/lpCZlSH3lZqR9xGZEOYuOME0bUu+x a5WL1qfwzTJgjdb8jZ60ISKz5XvgSxwnXMzhbzdMppy/z7nVmTeKEc82xF/lod+GOctd JsrUU8fxnD9J7Kudm7VjSO6GTGnLZw0BVv4zS38k+BDsHLh7fR3skWEjef5YEa0VbSuj j7nUSyOq/TkcOC1NnJRJ+TxeDpfE4+m1GvZJf+NLcAT8tYlvs2mhOFbbXDYKs6F5+WGU vDnQ== X-Gm-Message-State: AOAM530H0+mk+4Wsw9knYMZHFvtiFto2oyj7CZ7PGzpDbEaha/hdiQ+r zQkPTZPxT4MI3u0ZqQlIE6s= X-Google-Smtp-Source: ABdhPJwOIBT3zOReL4o/86VvY8k3AZk1n6Bh6FKOn0tIYsBbMdHqNPYi329AFtZcpmALpY60Rbleog== X-Received: by 2002:a17:907:961b:: with SMTP id gb27mr3488399ejc.340.1626896070700; Wed, 21 Jul 2021 12:34:30 -0700 (PDT) Received: from localhost.localdomain ([176.30.239.20]) by smtp.gmail.com with ESMTPSA id e22sm11359084edu.35.2021.07.21.12.34.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Jul 2021 12:34:30 -0700 (PDT) From: Pavel Skripkin To: Larry.Finger@lwfinger.net, florian.c.schilhabel@googlemail.com, gregkh@linuxfoundation.org, zhansayabagdaulet@gmail.com, straube.linux@gmail.com Cc: linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org, Pavel Skripkin Subject: [PATCH 0/2] staging: rtl8712: fix error handling Date: Wed, 21 Jul 2021 22:34:20 +0300 Message-Id: X-Mailer: git-send-email 2.32.0 Precedence: bulk X-Mailing-List: linux-staging@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hi, rtl8712 developers and stanging maintainers! In this patch series I rewrote error handling approach in rtl8712 driver. Detailed description can be found in commit messages. In short: There was strage approach to handle fw load error. For some reason fw callback was doing clean up stuff which can lead to UAF bug. For example: CPU0 CPU1 r871xu_dev_remove() rtl871x_load_fw_cb() free_netdev(netdev) wait_for_completion(netdev_priv->compl) <- UAF, slab-out-of-bound or smth else I've added free_netdev() call in my previous patch to this driver: e02a3b945816 ("staging: rtl8712: fix memory leak in rtl871x_load_fw_cb") to avoid memory leak and I believed, that this approach won't trigger anything else, but, unfortunately, I was wrong. Syzbot found 2 bugs [1] [2] and I decided to complely rewrite error handling in case of fw load failure. This patch series was tested with both reproducers and did't trigger any bugs. [1] https://syzkaller.appspot.com/bug?id=7646834b55c71c45ed85f601032daa6c23db0513 [2] https://syzkaller.appspot.com/bug?id=89c3ddb9936d3552995130298f1d2633ab9d3541 With regards, Pavel Skripkin Pavel Skripkin (2): staging: rtl8712: get rid of flush_scheduled_work staging: rtl8712: error handling refactoring drivers/staging/rtl8712/hal_init.c | 30 ++++++++----- drivers/staging/rtl8712/rtl8712_led.c | 8 ++++ drivers/staging/rtl8712/rtl871x_led.h | 1 + drivers/staging/rtl8712/rtl871x_pwrctrl.c | 8 ++++ drivers/staging/rtl8712/rtl871x_pwrctrl.h | 1 + drivers/staging/rtl8712/usb_intf.c | 51 ++++++++++------------- 6 files changed, 61 insertions(+), 38 deletions(-) -- 2.32.0