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BUG: KASAN: use-after-free in usb_udc_uevent+0x11f/0x130 drivers/usb/gadget/udc/core.c:1592
Read of size 8 at addr ffff88809424c050 by task systemd-udevd/21752

CPU: 1 PID: 21752 Comm: systemd-udevd Not tainted 5.7.0-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+0x188/0x20d lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xd3/0x413 mm/kasan/report.c:382
 __kasan_report.cold+0x20/0x38 mm/kasan/report.c:511
 kasan_report+0x35/0x50 mm/kasan/common.c:625
 usb_udc_uevent+0x11f/0x130 drivers/usb/gadget/udc/core.c:1592
 dev_uevent+0x26a/0x540 drivers/base/core.c:1501
 uevent_show+0x1bb/0x360 drivers/base/core.c:1557
 dev_attr_show+0x4b/0x90 drivers/base/core.c:1261
 sysfs_kf_seq_show+0x1f8/0x410 fs/sysfs/file.c:60
 seq_read+0x432/0xfd0 fs/seq_file.c:206
 kernfs_fop_read+0xe9/0x590 fs/kernfs/file.c:251
 __vfs_read+0x76/0x100 fs/read_write.c:426
 vfs_read+0x1f0/0x420 fs/read_write.c:462
 ksys_read+0x12d/0x250 fs/read_write.c:588
 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x7f2a80dd3910
Code: b6 fe ff ff 48 8d 3d 0f be 08 00 48 83 ec 08 e8 06 db 01 00 66 0f 1f 44 00 00 83 3d f9 2d 2c 00 00 75 10 b8 00 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 de 9b 01 00 48 89 04 24
RSP: 002b:00007ffff0d983c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00005605860cdbf0 RCX: 00007f2a80dd3910
RDX: 0000000000001000 RSI: 00005605860e7050 RDI: 0000000000000007
RBP: 00007f2a8108e440 R08: 00007f2a810921d8 R09: 0000000000001010
R10: 00005605860cdbf0 R11: 0000000000000246 R12: 0000000000001000
R13: 0000000000000d68 R14: 00005605860e7050 R15: 00007f2a8108d900

Allocated by task 21718:
 save_stack+0x1b/0x40 mm/kasan/common.c:49
 set_track mm/kasan/common.c:57 [inline]
 __kasan_kmalloc mm/kasan/common.c:495 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:468
 kmem_cache_alloc_trace+0x153/0x7d0 mm/slab.c:3551
 kmalloc include/linux/slab.h:555 [inline]
 kzalloc include/linux/slab.h:669 [inline]
 dev_new drivers/usb/gadget/legacy/raw_gadget.c:182 [inline]
 raw_open+0x8d/0x4d0 drivers/usb/gadget/legacy/raw_gadget.c:372
 misc_open+0x372/0x4a0 drivers/char/misc.c:141
 chrdev_open+0x219/0x5c0 fs/char_dev.c:414
 do_dentry_open+0x4ba/0x1290 fs/open.c:829
 do_open fs/namei.c:3229 [inline]
 path_openat+0x1e59/0x27d0 fs/namei.c:3346
 do_filp_open+0x192/0x260 fs/namei.c:3373
 do_sys_openat2+0x585/0x7d0 fs/open.c:1180
 do_sys_open+0xc3/0x140 fs/open.c:1196
 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3

Freed by task 21717:
 save_stack+0x1b/0x40 mm/kasan/common.c:49
 set_track mm/kasan/common.c:57 [inline]
 kasan_set_free_info mm/kasan/common.c:317 [inline]
 __kasan_slab_free+0xf7/0x140 mm/kasan/common.c:456
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x109/0x2b0 mm/slab.c:3757
 kref_put include/linux/kref.h:65 [inline]
 raw_release+0x218/0x290 drivers/usb/gadget/legacy/raw_gadget.c:411
 __fput+0x33e/0x880 fs/file_table.c:280
 task_work_run+0xf4/0x1b0 kernel/task_work.c:123
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x2fa/0x360 arch/x86/entry/common.c:165
 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:279 [inline]
 do_syscall_64+0x6b1/0x7d0 arch/x86/entry/common.c:305
 entry_SYSCALL_64_after_hwframe+0x49/0xb3

The buggy address belongs to the object at ffff88809424c000
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 80 bytes inside of
 4096-byte region [ffff88809424c000, ffff88809424d000)
The buggy address belongs to the page:
page:ffffea0002509300 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 head:ffffea0002509300 order:1 compound_mapcount:0
flags: 0xfffe0000010200(slab|head)
raw: 00fffe0000010200 ffffea000243ef88 ffffea0002a2f608 ffff8880aa002000
raw: 0000000000000000 ffff88809424c000 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809424bf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88809424bf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88809424c000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                 ^
 ffff88809424c080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88809424c100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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