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SubjectKASAN: use-after-free Read in service_outstanding_interrupt
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Hello,

syzbot found the following issue on:

HEAD commit: 7b4ea945 Revert "x86/mm/64: Do not sync vmalloc/ioremap ma..
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
console output: https://syzkaller.appspot.com/x/log.txt?x=108adf32900000
kernel config: https://syzkaller.appspot.com/x/.config?x=72a84c46d0c668c
dashboard link: https://syzkaller.appspot.com/bug?extid=9e04e2df4a32fb661daf
compiler: gcc (GCC) 10.1.0-syz 20200507

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9e04e2df4a32fb661daf@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: use-after-free in usb_submit_urb+0x10c4/0x13e0 drivers/usb/core/urb.c:368
Read of size 4 at addr ffff8881caa52018 by task syz-executor.3/13922

CPU: 1 PID: 13922 Comm: syz-executor.3 Not tainted 5.8.0-syzkaller #0
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+0xf6/0x16e lib/dump_stack.c:118
print_address_description.constprop.0+0x1a/0x210 mm/kasan/report.c:383
__kasan_report mm/kasan/report.c:513 [inline]
kasan_report.cold+0x37/0x7c mm/kasan/report.c:530
usb_submit_urb+0x10c4/0x13e0 drivers/usb/core/urb.c:368
service_outstanding_interrupt.part.0+0x5f/0xa0 drivers/usb/class/cdc-wdm.c:463
service_outstanding_interrupt drivers/usb/class/cdc-wdm.c:458 [inline]
wdm_read+0x9a0/0xbd0 drivers/usb/class/cdc-wdm.c:576
vfs_read+0x1df/0x520 fs/read_write.c:479
ksys_read+0x12d/0x250 fs/read_write.c:607
do_syscall_64+0x2d/0x40 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45ce79
Code: 2d b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 fb b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f8d2099fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00000000000252c0 RCX: 000000000045ce79
RDX: 00000000000000f2 RSI: 0000000020000100 RDI: 0000000000000003
RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007ffd66f595ff R14: 00007f8d209a09c0 R15: 000000000118bf2c

Allocated by task 4524:
save_stack+0x1b/0x40 mm/kasan/common.c:48
set_track mm/kasan/common.c:56 [inline]
__kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:494
kmalloc include/linux/slab.h:555 [inline]
kzalloc include/linux/slab.h:669 [inline]
usb_alloc_dev+0x51/0xf67 drivers/usb/core/usb.c:582
hub_port_connect drivers/usb/core/hub.c:5114 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5348 [inline]
port_event drivers/usb/core/hub.c:5494 [inline]
hub_event+0x1dff/0x4390 drivers/usb/core/hub.c:5576
process_one_work+0x94c/0x15f0 kernel/workqueue.c:2269
worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
kthread+0x392/0x470 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Freed by task 5477:
save_stack+0x1b/0x40 mm/kasan/common.c:48
set_track mm/kasan/common.c:56 [inline]
kasan_set_free_info mm/kasan/common.c:316 [inline]
__kasan_slab_free+0x116/0x160 mm/kasan/common.c:455
slab_free_hook mm/slub.c:1474 [inline]
slab_free_freelist_hook+0x53/0x140 mm/slub.c:1507
slab_free mm/slub.c:3072 [inline]
kfree+0xbc/0x2c0 mm/slub.c:4052
device_release+0x71/0x200 drivers/base/core.c:1800
kobject_cleanup lib/kobject.c:704 [inline]
kobject_release lib/kobject.c:735 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x1c8/0x540 lib/kobject.c:752
put_device+0x1b/0x30 drivers/base/core.c:3029
hub_port_connect drivers/usb/core/hub.c:5059 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5348 [inline]
port_event drivers/usb/core/hub.c:5494 [inline]
hub_event+0x1c93/0x4390 drivers/usb/core/hub.c:5576
process_one_work+0x94c/0x15f0 kernel/workqueue.c:2269
worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
kthread+0x392/0x470 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

The buggy address belongs to the object at ffff8881caa52000
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 24 bytes inside of
2048-byte region [ffff8881caa52000, ffff8881caa52800)
The buggy address belongs to the page:
page:ffffea00072a9400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 head:ffffea00072a9400 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x200000000010200(slab|head)
raw: 0200000000010200 0000000000000000 0000000100000001 ffff8881da00c000
raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
ffff8881caa51f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8881caa51f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8881caa52000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8881caa52080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8881caa52100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================


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