[syzbot] [usb?] UBSAN: shift-out-of-bounds in ax88772_bind

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: d7ee5bdce789 Merge tag 'firewire-fixes-6.17-rc1' of git://..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11835af0580000
kernel config: https://syzkaller.appspot.com/x/.config?x=412ee2f8b704a5e6
dashboard link: https://syzkaller.appspot.com/bug?extid=20537064367a0f98d597
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11d253a2580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/62d2c52c687a/disk-d7ee5bdc.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f827f7b0a929/vmlinux-d7ee5bdc.xz
kernel image: https://storage.googleapis.com/syzbot-assets/0babf789124a/bzImage-d7ee5bdc.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+205370...@syzkaller.appspotmail.com

asix 1-1:0.0 (unnamed net_device) (uninitialized): Failed to read reg index 0x0000: -71
asix 1-1:0.0 (unnamed net_device) (uninitialized): Error reading Medium Status register: ffffffb9
------------[ cut here ]------------
UBSAN: shift-out-of-bounds in drivers/net/usb/asix_devices.c:679:27
shift exponent 240 is too large for 64-bit type 'unsigned long'
CPU: 1 UID: 0 PID: 6020 Comm: kworker/1:4 Not tainted 6.17.0-rc1-syzkaller-00116-gd7ee5bdce789 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: usb_hub_wq hub_event
Call Trace:
<TASK>
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
ubsan_epilogue+0xa/0x40 lib/ubsan.c:233
__ubsan_handle_shift_out_of_bounds+0x386/0x410 lib/ubsan.c:494
ax88772_init_mdio drivers/net/usb/asix_devices.c:679 [inline]
ax88772_bind+0xdcf/0xfa0 drivers/net/usb/asix_devices.c:910
usbnet_probe+0xa93/0x2870 drivers/net/usb/usbnet.c:1781
usb_probe_interface+0x665/0xc30 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x26a/0x9e0 drivers/base/dd.c:659
__driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:801
driver_probe_device+0x4f/0x430 drivers/base/dd.c:831
__device_attach_driver+0x2ce/0x530 drivers/base/dd.c:959
bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:462
__device_attach+0x2b8/0x400 drivers/base/dd.c:1031
bus_probe_device+0x185/0x260 drivers/base/bus.c:537
device_add+0x7b6/0xb50 drivers/base/core.c:3689
usb_set_configuration+0x1a87/0x20e0 drivers/usb/core/message.c:2210
usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250
usb_probe_device+0x1c4/0x390 drivers/usb/core/driver.c:291
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x26a/0x9e0 drivers/base/dd.c:659
__driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:801
driver_probe_device+0x4f/0x430 drivers/base/dd.c:831
__device_attach_driver+0x2ce/0x530 drivers/base/dd.c:959
bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:462
__device_attach+0x2b8/0x400 drivers/base/dd.c:1031
bus_probe_device+0x185/0x260 drivers/base/bus.c:537
device_add+0x7b6/0xb50 drivers/base/core.c:3689
usb_new_device+0xa39/0x16f0 drivers/usb/core/hub.c:2694
hub_port_connect drivers/usb/core/hub.c:5566 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5706 [inline]
port_event drivers/usb/core/hub.c:5870 [inline]
hub_event+0x2958/0x4a20 drivers/usb/core/hub.c:5952
process_one_work kernel/workqueue.c:3236 [inline]
process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x70e/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
---[ end trace ]---


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

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If the report is already addressed, let syzbot know by replying with:
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If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
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If the report is a duplicate of another one, reply with:
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#syz undup

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: 99bade344cfa Merge tag 'rust-fixes-6.17' of git://git.kern..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=13ea1234580000
kernel config: https://syzkaller.appspot.com/x/.config?x=ce98061fb8ee27bc

dashboard link: https://syzkaller.appspot.com/bug?extid=20537064367a0f98d597
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=126d13a2580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1754faf0580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e140d0491611/disk-99bade34.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f581d5a99c83/vmlinux-99bade34.xz
kernel image: https://storage.googleapis.com/syzbot-assets/feceb1caceef/bzImage-99bade34.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+205370...@syzkaller.appspotmail.com

------------[ cut here ]------------
UBSAN: shift-out-of-bounds in drivers/net/usb/asix_devices.c:679:27

shift exponent 208 is too large for 64-bit type 'unsigned long'
CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Not tainted 6.17.0-rc1-syzkaller-00214-g99bade344cfa #0 PREEMPT(full)

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: usb_hub_wq hub_event
Call Trace:
<TASK>
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
ubsan_epilogue+0xa/0x40 lib/ubsan.c:233
__ubsan_handle_shift_out_of_bounds+0x386/0x410 lib/ubsan.c:494
ax88772_init_mdio drivers/net/usb/asix_devices.c:679 [inline]
ax88772_bind+0xdcf/0xfa0 drivers/net/usb/asix_devices.c:910

usbnet_probe+0xa96/0x2870 drivers/net/usb/usbnet.c:1781
usb_probe_interface+0x668/0xc30 drivers/usb/core/driver.c:396

call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x26a/0x9e0 drivers/base/dd.c:659
__driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:801
driver_probe_device+0x4f/0x430 drivers/base/dd.c:831
__device_attach_driver+0x2ce/0x530 drivers/base/dd.c:959
bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:462
__device_attach+0x2b8/0x400 drivers/base/dd.c:1031
bus_probe_device+0x185/0x260 drivers/base/bus.c:537
device_add+0x7b6/0xb50 drivers/base/core.c:3689
usb_set_configuration+0x1a87/0x20e0 drivers/usb/core/message.c:2210
usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250

usb_probe_device+0x1c1/0x390 drivers/usb/core/driver.c:291

call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x26a/0x9e0 drivers/base/dd.c:659
__driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:801
driver_probe_device+0x4f/0x430 drivers/base/dd.c:831
__device_attach_driver+0x2ce/0x530 drivers/base/dd.c:959
bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:462
__device_attach+0x2b8/0x400 drivers/base/dd.c:1031
bus_probe_device+0x185/0x260 drivers/base/bus.c:537
device_add+0x7b6/0xb50 drivers/base/core.c:3689
usb_new_device+0xa39/0x16f0 drivers/usb/core/hub.c:2694
hub_port_connect drivers/usb/core/hub.c:5566 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5706 [inline]
port_event drivers/usb/core/hub.c:5870 [inline]
hub_event+0x2958/0x4a20 drivers/usb/core/hub.c:5952
process_one_work kernel/workqueue.c:3236 [inline]
process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x70e/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
---[ end trace ]---


---

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-...@vger.kernel.org, syzkall...@googlegroups.com.

***

Subject:
Author: abinashsi...@gmail.com

#syz test

--- a/drivers/net/usb/asix_devices.c
+++ b/drivers/net/usb/asix_devices.c
@@ -872,6 +872,11 @@ static int ax88772_bind(struct usbnet *dev, struct
usb_interface *intf)
if (ret < 0)
return ret;

+ if (ret >= 32) {
+ netdev_warn(dev->net, "Invalid PHY address %d, clamping\n", ret);
+ return -EINVAL;
+ }
+
priv->phy_addr = ret;
priv->embd_phy = ((priv->phy_addr & 0x1f) == AX_EMBD_PHY_ADDR);


--

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

failed to apply patch:
checking file drivers/net/usb/asix_devices.c
patch: **** unexpected end of file in patch



Tested on:

commit: 8d561baa Merge tag 'x86_urgent_for_v6.17_rc2' of git:/..
git tree: upstream

kernel config: https://syzkaller.appspot.com/x/.config?x=ce98061fb8ee27bc
dashboard link: https://syzkaller.appspot.com/bug?extid=20537064367a0f98d597
compiler:

patch: https://syzkaller.appspot.com/x/patch.diff?x=1272aba2580000

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

failed to apply patch:
checking file drivers/net/usb/asix_devices.c

patch: **** malformed patch at line 13: dev->udev->bus->busnum, dev->udev->devnum);




Tested on:

commit: c17b750b Linux 6.17-rc2

git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=ce98061fb8ee27bc
dashboard link: https://syzkaller.appspot.com/bug?extid=20537064367a0f98d597
compiler:

patch: https://syzkaller.appspot.com/x/patch.diff?x=15f61ba2580000

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

failed to apply patch:
checking file drivers/net/usb/asix_devices.c

patch: **** malformed patch at line 12:

Tested on:

commit: c17b750b Linux 6.17-rc2
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=ce98061fb8ee27bc
dashboard link: https://syzkaller.appspot.com/bug?extid=20537064367a0f98d597
compiler:

patch: https://syzkaller.appspot.com/x/patch.diff?x=117aa442580000

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+205370...@syzkaller.appspotmail.com
Tested-by: syzbot+205370...@syzkaller.appspotmail.com

Tested on:

commit: c17b750b Linux 6.17-rc2
git tree: upstream

console output: https://syzkaller.appspot.com/x/log.txt?x=13d8eba2580000
kernel config: https://syzkaller.appspot.com/x/.config?x=fe8fc1adb24b215
dashboard link: https://syzkaller.appspot.com/bug?extid=20537064367a0f98d597

compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7

patch: https://syzkaller.appspot.com/x/patch.diff?x=13d99234580000

Note: testing is done by a robot and is best-effort only.

[Yuichiro Tsuji]

#syz test

diff --git a/drivers/net/usb/asix_devices.c b/drivers/net/usb/asix_devices.c index d9f5942ccc44..792ddda1ad49 100644
--- a/drivers/net/usb/asix_devices.c
+++ b/drivers/net/usb/asix_devices.c
@@ -676,7 +676,7 @@ static int ax88772_init_mdio(struct usbnet *dev)
priv->mdio->read = &asix_mdio_bus_read;
priv->mdio->write = &asix_mdio_bus_write;
priv->mdio->name = "Asix MDIO Bus";
- priv->mdio->phy_mask = ~(BIT(priv->phy_addr) | BIT(AX_EMBD_PHY_ADDR));
+ priv->mdio->phy_mask = ~(BIT(priv->phy_addr & 0x1f) |
+BIT(AX_EMBD_PHY_ADDR));
/* mii bus name is usb-<usb bus number>-<usb device number> */
snprintf(priv->mdio->id, MII_BUS_ID_SIZE, "usb-%03d:%03d", dev->udev->bus->busnum, dev->udev->devnum);

[Yuichiro Tsuji]

[Yuichiro Tsuji]

#syz test

diff --git a/drivers/net/usb/asix_devices.c b/drivers/net/usb/asix_devices.c
index d9f5942ccc44..792ddda1ad49 100644
--- a/drivers/net/usb/asix_devices.c
+++ b/drivers/net/usb/asix_devices.c
@@ -676,7 +676,7 @@ static int ax88772_init_mdio(struct usbnet *dev)
priv->mdio->read = &asix_mdio_bus_read;
priv->mdio->write = &asix_mdio_bus_write;
priv->mdio->name = "Asix MDIO Bus";
- priv->mdio->phy_mask = ~(BIT(priv->phy_addr) | BIT(AX_EMBD_PHY_ADDR));

+ priv->mdio->phy_mask = ~(BIT(priv->phy_addr & 0x1f) | BIT(AX_EMBD_PHY_ADDR));