linux-kernel - [syzbot] KMSAN: uninit-value in kalmia_send_init

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Date:   Tue, 31 Jan 2023 00:04:42 -0800
From:   syzbot <syzbot+cd80c5ef5121bfe85b55@...kaller.appspotmail.com>
To:     davem@...emloft.net, edumazet@...gle.com, glider@...gle.com,
        kuba@...nel.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, netdev@...r.kernel.org,
        pabeni@...hat.com, syzkaller-bugs@...glegroups.com
Subject: [syzbot] KMSAN: uninit-value in kalmia_send_init_packet

Hello,

syzbot found the following issue on:

HEAD commit:    41c66f470616 kmsan: silence -Wmissing-prototypes warnings
git tree:       https://github.com/google/kmsan.git master
console+strace: https://syzkaller.appspot.com/x/log.txt?x=122f123e480000
kernel config:  https://syzkaller.appspot.com/x/.config?x=a9a22da1efde3af6
dashboard link: https://syzkaller.appspot.com/bug?extid=cd80c5ef5121bfe85b55
compiler:       clang version 15.0.0 (https://github.com/llvm/llvm-project.git 610139d2d9ce6746b3c617fb3e2f7886272d26ff), GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=148c93e1480000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=133524d1480000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/69d5eef879e6/disk-41c66f47.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e91a447c44a2/vmlinux-41c66f47.xz
kernel image: https://storage.googleapis.com/syzbot-assets/c549edb9c410/bzImage-41c66f47.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+cd80c5ef5121bfe85b55@...kaller.appspotmail.com

usb 1-1: Product: syz
usb 1-1: Manufacturer: syz
usb 1-1: SerialNumber: syz
usb 1-1: config 0 descriptor??
=====================================================
BUG: KMSAN: uninit-value in kalmia_send_init_packet+0x56f/0x5f0 drivers/net/usb/kalmia.c:67
 kalmia_send_init_packet+0x56f/0x5f0 drivers/net/usb/kalmia.c:67
 kalmia_init_and_get_ethernet_addr drivers/net/usb/kalmia.c:113 [inline]
 kalmia_bind+0x2fd/0x5a0 drivers/net/usb/kalmia.c:148
 usbnet_probe+0xf8e/0x3de0 drivers/net/usb/usbnet.c:1745
 usb_probe_interface+0xc4b/0x11f0 drivers/usb/core/driver.c:396
 really_probe+0x506/0x1000 drivers/base/dd.c:639
 __driver_probe_device+0x2fa/0x3d0 drivers/base/dd.c:778
 driver_probe_device+0x72/0x7a0 drivers/base/dd.c:808
 __device_attach_driver+0x548/0x8e0 drivers/base/dd.c:936
 bus_for_each_drv+0x1fc/0x360 drivers/base/bus.c:427
 __device_attach+0x42a/0x720 drivers/base/dd.c:1008
 device_initial_probe+0x2e/0x40 drivers/base/dd.c:1057
 bus_probe_device+0x13c/0x3b0 drivers/base/bus.c:487
 device_add+0x1d4b/0x26c0 drivers/base/core.c:3479
 usb_set_configuration+0x3157/0x3860 drivers/usb/core/message.c:2171
 usb_generic_driver_probe+0x105/0x290 drivers/usb/core/generic.c:238
 usb_probe_device+0x288/0x490 drivers/usb/core/driver.c:293
 really_probe+0x506/0x1000 drivers/base/dd.c:639
 __driver_probe_device+0x2fa/0x3d0 drivers/base/dd.c:778
 driver_probe_device+0x72/0x7a0 drivers/base/dd.c:808
 __device_attach_driver+0x548/0x8e0 drivers/base/dd.c:936
 bus_for_each_drv+0x1fc/0x360 drivers/base/bus.c:427
 __device_attach+0x42a/0x720 drivers/base/dd.c:1008
 device_initial_probe+0x2e/0x40 drivers/base/dd.c:1057
 bus_probe_device+0x13c/0x3b0 drivers/base/bus.c:487
 device_add+0x1d4b/0x26c0 drivers/base/core.c:3479
 usb_new_device+0x17ac/0x2370 drivers/usb/core/hub.c:2576
 hub_port_connect drivers/usb/core/hub.c:5408 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5552 [inline]
 port_event drivers/usb/core/hub.c:5712 [inline]
 hub_event+0x56f3/0x7660 drivers/usb/core/hub.c:5794
 process_one_work+0xb27/0x13e0 kernel/workqueue.c:2289
 worker_thread+0x1076/0x1d60 kernel/workqueue.c:2436
 kthread+0x31b/0x430 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

Local variable act_len created at:
 kalmia_send_init_packet+0x4e/0x5f0 drivers/net/usb/kalmia.c:64
 kalmia_init_and_get_ethernet_addr drivers/net/usb/kalmia.c:113 [inline]
 kalmia_bind+0x2fd/0x5a0 drivers/net/usb/kalmia.c:148

CPU: 1 PID: 4675 Comm: kworker/1:3 Not tainted 6.2.0-rc5-syzkaller-80200-g41c66f470616 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
Workqueue: usb_hub_wq hub_event
=====================================================

---
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