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BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:425 [inline]
BUG: KASAN: slab-out-of-bounds in bpf_prog_create+0xe9/0x250 net/core/filter.c:1351
Read of size 64 at addr ffff88809c615480 by task syz-executor.2/24576

CPU: 1 PID: 24576 Comm: syz-executor.2 Not tainted 5.4.0-rc8-next-20191122-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+0x197/0x210 lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374
 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506
 kasan_report+0x12/0x20 mm/kasan/common.c:638
 check_memory_region_inline mm/kasan/generic.c:185 [inline]
 check_memory_region+0x134/0x1a0 mm/kasan/generic.c:192
 memcpy+0x24/0x50 mm/kasan/common.c:124
 memcpy include/linux/string.h:425 [inline]
 bpf_prog_create+0xe9/0x250 net/core/filter.c:1351
 get_filter.isra.0+0x108/0x1a0 drivers/net/ppp/ppp_generic.c:572
 ppp_get_filter drivers/net/ppp/ppp_generic.c:584 [inline]
 ppp_ioctl+0x1293/0x2580 drivers/net/ppp/ppp_generic.c:801
 vfs_ioctl fs/ioctl.c:47 [inline]
 file_ioctl fs/ioctl.c:545 [inline]
 do_vfs_ioctl+0x977/0x14e0 fs/ioctl.c:732
 ksys_ioctl+0xab/0xd0 fs/ioctl.c:749
 __do_sys_ioctl fs/ioctl.c:756 [inline]
 __se_sys_ioctl fs/ioctl.c:754 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:754
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a639
Code: ad 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f74a3a62c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a639
RDX: 0000000020000100 RSI: 0000000040107446 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f74a3a636d4
R13: 00000000004c459c R14: 00000000004d8cb0 R15: 00000000ffffffff

Allocated by task 24576:
 save_stack+0x23/0x90 mm/kasan/common.c:71
 set_track mm/kasan/common.c:79 [inline]
 __kasan_kmalloc mm/kasan/common.c:512 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:485
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:526
 __do_kmalloc mm/slab.c:3656 [inline]
 __kmalloc_track_caller+0x15f/0x760 mm/slab.c:3671
 memdup_user+0x26/0xd0 mm/util.c:172
 get_filter.isra.0+0xd7/0x1a0 drivers/net/ppp/ppp_generic.c:568
 ppp_get_filter drivers/net/ppp/ppp_generic.c:584 [inline]
 ppp_ioctl+0x1293/0x2580 drivers/net/ppp/ppp_generic.c:801
 vfs_ioctl fs/ioctl.c:47 [inline]
 file_ioctl fs/ioctl.c:545 [inline]
 do_vfs_ioctl+0x977/0x14e0 fs/ioctl.c:732
 ksys_ioctl+0xab/0xd0 fs/ioctl.c:749
 __do_sys_ioctl fs/ioctl.c:756 [inline]
 __se_sys_ioctl fs/ioctl.c:754 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:754
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 20140:
 save_stack+0x23/0x90 mm/kasan/common.c:71
 set_track mm/kasan/common.c:79 [inline]
 kasan_set_free_info mm/kasan/common.c:334 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:473
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:482
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x10a/0x2c0 mm/slab.c:3757
 kfree_const+0x59/0x70 mm/util.c:40
 kernfs_put fs/kernfs/dir.c:528 [inline]
 kernfs_put+0x1a0/0x590 fs/kernfs/dir.c:506
 sysfs_put include/linux/sysfs.h:564 [inline]
 kobject_del+0xb1/0x170 lib/kobject.c:624
 device_del+0x8bb/0xda0 drivers/base/core.c:2676
 netdev_unregister_kobject+0x19a/0x1f0 net/core/net-sysfs.c:1715
 rollback_registered_many+0xafe/0x10d0 net/core/dev.c:8770
 rollback_registered+0x109/0x1d0 net/core/dev.c:8788
 unregister_netdevice_queue net/core/dev.c:9887 [inline]
 unregister_netdevice_queue+0x1ee/0x2c0 net/core/dev.c:9880
 unregister_netdevice include/linux/netdevice.h:2665 [inline]
 ppp_release+0x1ca/0x1f0 drivers/net/ppp/ppp_generic.c:405
 __fput+0x2ff/0x890 fs/file_table.c:280
 ____fput+0x16/0x20 fs/file_table.c:313
 task_work_run+0x145/0x1c0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x8e7/0x2e00 kernel/exit.c:797
 do_group_exit+0x135/0x360 kernel/exit.c:895
 __do_sys_exit_group kernel/exit.c:906 [inline]
 __se_sys_exit_group kernel/exit.c:904 [inline]
 __x64_sys_exit_group+0x44/0x50 kernel/exit.c:904
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff88809c615480
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes inside of
 32-byte region [ffff88809c615480, ffff88809c6154a0)
The buggy address belongs to the page:
page:ffffea0002718540 refcount:1 mapcount:0 mapping:ffff8880aa4001c0 index:0xffff88809c615fc1
raw: 01fffc0000000200 ffffea0002862848 ffffea0002a5de08 ffff8880aa4001c0
raw: ffff88809c615fc1 ffff88809c615000 0000000100000032 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809c615380: 00 00 03 fc fc fc fc fc 05 fc fc fc fc fc fc fc
 ffff88809c615400: 00 00 fc fc fc fc fc fc 00 00 fc fc fc fc fc fc
>ffff88809c615480: 00 fc fc fc fc fc fc fc 00 00 06 fc fc fc fc fc
                      ^
 ffff88809c615500: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff88809c615580: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
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