syzbot

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BUG: KASAN: double-free or invalid-free in fuzzer_ioctl_ep0_write drivers/usb/gadget/fuzzer/fuzzer.c:710 [inline]
BUG: KASAN: double-free or invalid-free in fuzzer_ioctl+0x123b/0x3100 drivers/usb/gadget/fuzzer/fuzzer.c:1209

CPU: 1 PID: 13541 Comm: syz-executor.2 Not tainted 5.3.0-rc2+ #23
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+0xca/0x13e lib/dump_stack.c:113
 print_address_description+0x6a/0x32c mm/kasan/report.c:351
 kasan_report_invalid_free+0x61/0xa0 mm/kasan/report.c:444
 __kasan_slab_free+0x162/0x180 mm/kasan/common.c:428
 slab_free_hook mm/slub.c:1423 [inline]
 slab_free_freelist_hook mm/slub.c:1470 [inline]
 slab_free mm/slub.c:3012 [inline]
 kfree+0xe4/0x2f0 mm/slub.c:3953
 fuzzer_ioctl_ep0_write drivers/usb/gadget/fuzzer/fuzzer.c:710 [inline]
 fuzzer_ioctl+0x123b/0x3100 drivers/usb/gadget/fuzzer/fuzzer.c:1209
 full_proxy_unlocked_ioctl+0x111/0x170 fs/debugfs/file.c:205
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0xd2d/0x1330 fs/ioctl.c:696
 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:718
 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459697
Code: 48 83 c4 08 48 89 d8 5b 5d c3 66 0f 1f 84 00 00 00 00 00 48 89 e8 48 f7 d8 48 39 c3 0f 92 c0 eb 92 66 90 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 5d b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f929ac16238 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000459697
RDX: 00007f929ac163f0 RSI: 0000000040085503 RDI: 0000000000000006
RBP: 0000000000000009 R08: 0000000000000301 R09: 0000000000000409
R10: 0000000000000075 R11: 0000000000000246 R12: 00000000004be802
R13: 00000000004bee76 R14: 00000000004dfd98 R15: 00000000ffffffff

Allocated by task 13541:
 save_stack+0x1b/0x80 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77 [inline]
 __kasan_kmalloc mm/kasan/common.c:487 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:460
 slab_post_alloc_hook mm/slab.h:520 [inline]
 slab_alloc_node mm/slub.c:2766 [inline]
 slab_alloc mm/slub.c:2774 [inline]
 __kmalloc_track_caller+0xc8/0x2a0 mm/slub.c:4331
 memdup_user+0x22/0xb0 mm/util.c:165
 fuzzer_ioctl_ep0_write drivers/usb/gadget/fuzzer/fuzzer.c:646 [inline]
 fuzzer_ioctl+0xe2e/0x3100 drivers/usb/gadget/fuzzer/fuzzer.c:1209
 full_proxy_unlocked_ioctl+0x111/0x170 fs/debugfs/file.c:205
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0xd2d/0x1330 fs/ioctl.c:696
 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:718
 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 13541:
 save_stack+0x1b/0x80 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77 [inline]
 __kasan_slab_free+0x130/0x180 mm/kasan/common.c:449
 slab_free_hook mm/slub.c:1423 [inline]
 slab_free_freelist_hook mm/slub.c:1470 [inline]
 slab_free mm/slub.c:3012 [inline]
 kfree+0xe4/0x2f0 mm/slub.c:3953
 fuzzer_ioctl_ep0_write drivers/usb/gadget/fuzzer/fuzzer.c:675 [inline]
 fuzzer_ioctl+0x23db/0x3100 drivers/usb/gadget/fuzzer/fuzzer.c:1209
 full_proxy_unlocked_ioctl+0x111/0x170 fs/debugfs/file.c:205
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0xd2d/0x1330 fs/ioctl.c:696
 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:718
 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8881d4e82fe0
 which belongs to the cache kmalloc-16 of size 16
The buggy address is located 0 bytes inside of
 16-byte region [ffff8881d4e82fe0, ffff8881d4e82ff0)
The buggy address belongs to the page:
page:ffffea000753a080 refcount:1 mapcount:0 mapping:ffff8881da003680 index:0x0
flags: 0x200000000000200(slab)
raw: 0200000000000200 ffffea00073b2200 0000001200000012 ffff8881da003680
raw: 0000000000000000 0000000080800080 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881d4e82e80: 00 00 fc fc 00 00 fc fc fb fb fc fc 00 00 fc fc
 ffff8881d4e82f00: 00 00 fc fc 00 00 fc fc 00 00 fc fc 00 00 fc fc
>ffff8881d4e82f80: 00 00 fc fc 00 00 fc fc fb fb fc fc fb fb fc fc
                                                       ^
 ffff8881d4e83000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881d4e83080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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