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bits=128/128); Sun, 30 Jun 2019 16:46:53 -0700 (PDT) From: Phong Tran To: syzbot+8a3fc6674bbc3978ed4e@syzkaller.appspotmail.com Cc: davem@davemloft.net, glider@google.com, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, lynxis@fe80.eu, marcel.ziswiler@toradex.com, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, yang.wei9@zte.com.cn, zhang.run@zte.com.cn, skhan@linuxfoundation.org, linux-kernel-mentees@lists.linuxfoundation.org, Phong Tran Subject: [PATCH] net: usb: asix: init MAC address buffers Date: Mon, 1 Jul 2019 06:45:33 +0700 Message-Id: <20190630234533.15089-1-tranmanphong@gmail.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <00000000000008f06d058a6e9783@google.com> References: <00000000000008f06d058a6e9783@google.com> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This is for fixing bug KMSAN: uninit-value in ax88772_bind Tested by https://groups.google.com/d/msg/syzkaller-bugs/aFQurGotng4/cFe9nxMCCwAJ Reported-by: syzbot+8a3fc6674bbc3978ed4e@syzkaller.appspotmail.com syzbot found the following crash on: HEAD commit: f75e4cfe kmsan: use kmsan_handle_urb() in urb.c git tree: kmsan console output: https://syzkaller.appspot.com/x/log.txt?x=136d720ea00000 kernel config: https://syzkaller.appspot.com/x/.config?x=602468164ccdc30a dashboard link: https://syzkaller.appspot.com/bug?extid=8a3fc6674bbc3978ed4e compiler: clang version 9.0.0 (/home/glider/llvm/clang 06d00afa61eef8f7f501ebdb4e8612ea43ec2d78) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12788316a00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=120359aaa00000 ================================================================== BUG: KMSAN: uninit-value in is_valid_ether_addr include/linux/etherdevice.h:200 [inline] BUG: KMSAN: uninit-value in asix_set_netdev_dev_addr drivers/net/usb/asix_devices.c:73 [inline] BUG: KMSAN: uninit-value in ax88772_bind+0x93d/0x11e0 drivers/net/usb/asix_devices.c:724 CPU: 0 PID: 3348 Comm: kworker/0:2 Not tainted 5.1.0+ #1 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: usb_hub_wq hub_event Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x191/0x1f0 lib/dump_stack.c:113 kmsan_report+0x130/0x2a0 mm/kmsan/kmsan.c:622 __msan_warning+0x75/0xe0 mm/kmsan/kmsan_instr.c:310 is_valid_ether_addr include/linux/etherdevice.h:200 [inline] asix_set_netdev_dev_addr drivers/net/usb/asix_devices.c:73 [inline] ax88772_bind+0x93d/0x11e0 drivers/net/usb/asix_devices.c:724 usbnet_probe+0x10f5/0x3940 drivers/net/usb/usbnet.c:1728 usb_probe_interface+0xd66/0x1320 drivers/usb/core/driver.c:361 really_probe+0xdae/0x1d80 drivers/base/dd.c:513 driver_probe_device+0x1b3/0x4f0 drivers/base/dd.c:671 __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:778 bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:454 __device_attach+0x454/0x730 drivers/base/dd.c:844 device_initial_probe+0x4a/0x60 drivers/base/dd.c:891 bus_probe_device+0x137/0x390 drivers/base/bus.c:514 device_add+0x288d/0x30e0 drivers/base/core.c:2106 usb_set_configuration+0x30dc/0x3750 drivers/usb/core/message.c:2027 generic_probe+0xe7/0x280 drivers/usb/core/generic.c:210 usb_probe_device+0x14c/0x200 drivers/usb/core/driver.c:266 really_probe+0xdae/0x1d80 drivers/base/dd.c:513 driver_probe_device+0x1b3/0x4f0 drivers/base/dd.c:671 __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:778 bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:454 __device_attach+0x454/0x730 drivers/base/dd.c:844 device_initial_probe+0x4a/0x60 drivers/base/dd.c:891 bus_probe_device+0x137/0x390 drivers/base/bus.c:514 device_add+0x288d/0x30e0 drivers/base/core.c:2106 usb_new_device+0x23e5/0x2ff0 drivers/usb/core/hub.c:2534 hub_port_connect drivers/usb/core/hub.c:5089 [inline] hub_port_connect_change drivers/usb/core/hub.c:5204 [inline] port_event drivers/usb/core/hub.c:5350 [inline] hub_event+0x48d1/0x7290 drivers/usb/core/hub.c:5432 process_one_work+0x1572/0x1f00 kernel/workqueue.c:2269 process_scheduled_works kernel/workqueue.c:2331 [inline] worker_thread+0x189c/0x2460 kernel/workqueue.c:2417 kthread+0x4b5/0x4f0 kernel/kthread.c:254 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355 Signed-off-by: Phong Tran --- drivers/net/usb/asix_devices.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/usb/asix_devices.c b/drivers/net/usb/asix_devices.c index c9bc96310ed4..f514d19316b1 100644 --- a/drivers/net/usb/asix_devices.c +++ b/drivers/net/usb/asix_devices.c @@ -230,6 +230,7 @@ static int ax88172_bind(struct usbnet *dev, struct usb_interface *intf) int i; unsigned long gpio_bits = dev->driver_info->data; + memset(buf, 0, sizeof(buf)); usbnet_get_endpoints(dev,intf); /* Toggle the GPIOs in a manufacturer/model specific way */ @@ -681,6 +682,7 @@ static int ax88772_bind(struct usbnet *dev, struct usb_interface *intf) u32 phyid; struct asix_common_private *priv; + memset(buf, 0, sizeof(buf)); usbnet_get_endpoints(dev, intf); /* Maybe the boot loader passed the MAC address via device tree */ @@ -1063,6 +1065,7 @@ static int ax88178_bind(struct usbnet *dev, struct usb_interface *intf) int ret; u8 buf[ETH_ALEN]; + memset(buf, 0, sizeof(buf)); usbnet_get_endpoints(dev,intf); /* Get the MAC address */ -- 2.11.0