linux-kernel - [syzbot] KMSAN: uninit-value in ax88178

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Date:   Wed, 05 Jan 2022 04:04:20 -0800
From:   syzbot <syzbot+6ca9f7867b77c2d316ac@...kaller.appspotmail.com>
To:     andrew@...n.ch, davem@...emloft.net, glider@...gle.com,
        kuba@...nel.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, linux@...pel-privat.de,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] KMSAN: uninit-value in ax88178_reset

Hello,

syzbot found the following issue on:

HEAD commit:    b0a8b5053e8b kmsan: core: add dependency on DEBUG_KERNEL
git tree:       https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=159cf693b00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=46a956fc7a887c60
dashboard link: https://syzkaller.appspot.com/bug?extid=6ca9f7867b77c2d316ac
compiler:       clang version 14.0.0 (/usr/local/google/src/llvm-git-monorepo 2b554920f11c8b763cd9ed9003f4e19b919b8e1f), GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14413193b00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=127716a3b00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6ca9f7867b77c2d316ac@...kaller.appspotmail.com

asix 1-1:0.0 eth1: Failed to read reg index 0x0000: -32
asix 1-1:0.0 eth1: Failed to read reg index 0x0000: -32
=====================================================
BUG: KMSAN: uninit-value in ax88178_reset+0xfd2/0x1590 drivers/net/usb/asix_devices.c:946 drivers/net/usb/asix_devices.c:946
 ax88178_reset+0xfd2/0x1590 drivers/net/usb/asix_devices.c:946 drivers/net/usb/asix_devices.c:946
 usbnet_open+0x16d/0x1940 drivers/net/usb/usbnet.c:894 drivers/net/usb/usbnet.c:894
 __dev_open+0x920/0xb90 net/core/dev.c:1490 net/core/dev.c:1490
 __dev_change_flags+0x4da/0xd40 net/core/dev.c:8796 net/core/dev.c:8796
 dev_change_flags+0xf5/0x280 net/core/dev.c:8867 net/core/dev.c:8867
 devinet_ioctl+0xfc1/0x3060 net/ipv4/devinet.c:1144 net/ipv4/devinet.c:1144
 inet_ioctl+0x59f/0x820 net/ipv4/af_inet.c:969 net/ipv4/af_inet.c:969
 sock_do_ioctl net/socket.c:1118 [inline]
 sock_do_ioctl net/socket.c:1118 [inline] net/socket.c:1235
 sock_ioctl+0xa3f/0x13d0 net/socket.c:1235 net/socket.c:1235
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 vfs_ioctl fs/ioctl.c:51 [inline] fs/ioctl.c:860
 __do_sys_ioctl fs/ioctl.c:874 [inline] fs/ioctl.c:860
 __se_sys_ioctl+0x2df/0x4a0 fs/ioctl.c:860 fs/ioctl.c:860
 __x64_sys_ioctl+0xd8/0x110 fs/ioctl.c:860 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_x64 arch/x86/entry/common.c:51 [inline] arch/x86/entry/common.c:82
 do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Local variable status created at:
 ax88178_reset+0x69/0x1590
 usbnet_open+0x16d/0x1940 drivers/net/usb/usbnet.c:894 drivers/net/usb/usbnet.c:894

CPU: 1 PID: 3057 Comm: dhcpcd Not tainted 5.16.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
=====================================================


---
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