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SubjectKASAN: slab-out-of-bounds Read in vhci_hub_control
From
Hello,

syzbot found the following crash on:

HEAD commit: 420f51f4ab6b Merge tag 'arm64-fixes' of git://git.kernel.o..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=126a6f0e400000
kernel config: https://syzkaller.appspot.com/x/.config?x=531a917630d2a492
dashboard link: https://syzkaller.appspot.com/bug?extid=bccc1fe10b70fadc78d0
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=121caa46400000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14ed8ab6400000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+bccc1fe10b70fadc78d0@syzkaller.appspotmail.com

random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
vhci_hcd: invalid port number 132
==================================================================
BUG: KASAN: slab-out-of-bounds in vhci_hub_control+0x1b88/0x1bf0
drivers/usb/usbip/vhci_hcd.c:441
Read of size 4 at addr ffff8801ce615ebc by task syz-executor741/4647

CPU: 1 PID: 4647 Comm: syz-executor741 Not tainted 4.19.0-rc1+ #217
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
print_address_description+0x6c/0x20b mm/kasan/report.c:256
kasan_report_error mm/kasan/report.c:354 [inline]
kasan_report.cold.7+0x242/0x30d mm/kasan/report.c:412
__asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432
vhci_hub_control+0x1b88/0x1bf0 drivers/usb/usbip/vhci_hcd.c:441
rh_call_control drivers/usb/core/hcd.c:679 [inline]
rh_urb_enqueue drivers/usb/core/hcd.c:838 [inline]
usb_hcd_submit_urb+0x184a/0x2160 drivers/usb/core/hcd.c:1651
usb_submit_urb+0x895/0x14d0 drivers/usb/core/urb.c:570
usb_start_wait_urb+0x140/0x360 drivers/usb/core/message.c:57
usb_internal_control_msg drivers/usb/core/message.c:101 [inline]
usb_control_msg+0x332/0x4e0 drivers/usb/core/message.c:152
proc_control+0x99b/0xef0 drivers/usb/core/devio.c:1106
usbdev_do_ioctl+0x1eb4/0x3b30 drivers/usb/core/devio.c:2394
usbdev_ioctl+0x25/0x30 drivers/usb/core/devio.c:2551
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:501 [inline]
do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685
ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702
__do_sys_ioctl fs/ioctl.c:709 [inline]
__se_sys_ioctl fs/ioctl.c:707 [inline]
__x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x449329
Code: e8 ac b7 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff
ff 0f 83 ab d6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f8653ff9da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000006dac28 RCX: 0000000000449329
RDX: 0000000020000100 RSI: 00000000c0185500 RDI: 0000000000000003
RBP: 00000000006dac20 R08: 00000000006dac2c R09: 0000000000000000
R10: 00007f8653ffa700 R11: 0000000000000246 R12: 00000000006dac2c
R13: 2330302f6273752f R14: 7375622f7665642f R15: 00000000006dad2c

Allocated by task 1:
save_stack+0x43/0xd0 mm/kasan/kasan.c:448
set_track mm/kasan/kasan.c:460 [inline]
kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
kmem_cache_alloc_trace+0x152/0x730 mm/slab.c:3620
kmalloc include/linux/slab.h:513 [inline]
kzalloc include/linux/slab.h:707 [inline]
usb_set_configuration+0x10e9/0x19f0 drivers/usb/core/message.c:1834
generic_probe+0xb6/0x110 drivers/usb/core/generic.c:174
usb_probe_device+0xaf/0x110 drivers/usb/core/driver.c:266
really_probe+0x5be/0x850 drivers/base/dd.c:500
driver_probe_device+0x108/0x210 drivers/base/dd.c:662
__device_attach_driver+0x25a/0x2d0 drivers/base/dd.c:758
bus_for_each_drv+0x16b/0x1f0 drivers/base/bus.c:461
__device_attach+0x2a1/0x430 drivers/base/dd.c:815
device_initial_probe+0x1a/0x20 drivers/base/dd.c:862
bus_probe_device+0x1fb/0x2a0 drivers/base/bus.c:521
device_add+0x93e/0x17b0 drivers/base/core.c:1927
usb_new_device+0x8ac/0x12b0 drivers/usb/core/hub.c:2485
register_root_hub drivers/usb/core/hcd.c:1105 [inline]
usb_add_hcd+0xb1f/0x1910 drivers/usb/core/hcd.c:2882
vhci_hcd_probe+0xfb/0x240 drivers/usb/usbip/vhci_hcd.c:1316
platform_drv_probe+0x96/0x160 drivers/base/platform.c:579
really_probe+0x5be/0x850 drivers/base/dd.c:500
driver_probe_device+0x108/0x210 drivers/base/dd.c:662
__device_attach_driver+0x25a/0x2d0 drivers/base/dd.c:758
bus_for_each_drv+0x16b/0x1f0 drivers/base/bus.c:461
__device_attach+0x2a1/0x430 drivers/base/dd.c:815
device_initial_probe+0x1a/0x20 drivers/base/dd.c:862
bus_probe_device+0x1fb/0x2a0 drivers/base/bus.c:521
device_add+0x93e/0x17b0 drivers/base/core.c:1927
platform_device_add+0x36e/0x6f0 drivers/base/platform.c:417
vhci_hcd_init+0x386/0x4e0 drivers/usb/usbip/vhci_hcd.c:1500
do_one_initcall+0x127/0x838 init/main.c:885
do_initcall_level init/main.c:953 [inline]
do_initcalls init/main.c:961 [inline]
do_basic_setup init/main.c:979 [inline]
kernel_init_freeable+0x4bb/0x5ae init/main.c:1144
kernel_init+0x11/0x1b3 init/main.c:1063
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff8801ce615300
which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 956 bytes to the right of
2048-byte region [ffff8801ce615300, ffff8801ce615b00)
The buggy address belongs to the page:
page:ffffea0007398500 count:1 mapcount:0 mapping:ffff8801dac00c40 index:0x0
compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffffea0007397988 ffffea0007398788 ffff8801dac00c40
raw: 0000000000000000 ffff8801ce614200 0000000100000003 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
ffff8801ce615d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8801ce615e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> ffff8801ce615e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff8801ce615f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8801ce615f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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syzbot.
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