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Sat, 03 Oct 2020 13:58:21 -0700 (PDT) Received: from [192.168.0.104] ([49.207.217.69]) by smtp.gmail.com with ESMTPSA id i17sm6640460pfa.29.2020.10.03.13.58.17 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 03 Oct 2020 13:58:21 -0700 (PDT) To: Joe Perches References: <20201001073221.239618-1-anant.thazhemadam@gmail.com> From: Anant Thazhemadam Message-ID: <81a5d8b6-5258-1f2e-15da-4324579799df@gmail.com> Date: Sun, 4 Oct 2020 02:28:14 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US Cc: Petko Manolov , syzbot+abbc768b560c84d92fd3@syzkaller.appspotmail.com, netdev@vger.kernel.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Jakub Kicinski , linux-kernel-mentees@lists.linuxfoundation.org, "David S. Miller" Subject: Re: [Linux-kernel-mentees] [PATCH v2] net: usb: rtl8150: prevent set_ethernet_addr from setting uninit address X-BeenThere: linux-kernel-mentees@lists.linuxfoundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-kernel-mentees-bounces@lists.linuxfoundation.org Sender: "Linux-kernel-mentees" On 04/10/20 1:08 am, Joe Perches wrote: > On Thu, 2020-10-01 at 13:02 +0530, Anant Thazhemadam wrote: >> When get_registers() fails (which happens when usb_control_msg() fails) >> in set_ethernet_addr(), the uninitialized value of node_id gets copied >> as the address. > unrelated trivia: > >> diff --git a/drivers/net/usb/rtl8150.c b/drivers/net/usb/rtl8150.c > [] >> @@ -274,12 +274,17 @@ static int write_mii_word(rtl8150_t * dev, u8 phy, __u8 indx, u16 reg) >> return 1; >> } >> >> -static inline void set_ethernet_addr(rtl8150_t * dev) >> +static bool set_ethernet_addr(rtl8150_t *dev) >> { >> u8 node_id[6]; > This might be better as: > > u8 node_id[ETH_ALEN]; > >> + int ret; >> >> - get_registers(dev, IDR, sizeof(node_id), node_id); >> - memcpy(dev->netdev->dev_addr, node_id, sizeof(node_id)); >> + ret = get_registers(dev, IDR, sizeof(node_id), node_id); >> + if (ret == sizeof(node_id)) { >> + memcpy(dev->netdev->dev_addr, node_id, sizeof(node_id)); > and > ether_addr_copy(dev->netdev->dev_addr, node_id); > > I will include this change as well, in the v3. Thank you for pointing that out. Thanks, Anant _______________________________________________ Linux-kernel-mentees mailing list Linux-kernel-mentees@lists.linuxfoundation.org https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees