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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 448 at addr ffff8880a6a9fc00 by task syz-executor.5/10559

CPU: 1 PID: 10559 Comm: syz-executor.5 Not tainted 5.4.0-next-20191206-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:639
 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:125
 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+0x12f7/0x2750 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: 0033:0x45a6f9
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:00007f37a3f32c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a6f9
RDX: 0000000020000100 RSI: 0000000040107447 RDI: 0000000000000004
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f37a3f336d4
R13: 00000000004c484e R14: 00000000004da010 R15: 00000000ffffffff

Allocated by task 10559:
 save_stack+0x23/0x90 mm/kasan/common.c:72
 set_track mm/kasan/common.c:80 [inline]
 __kasan_kmalloc mm/kasan/common.c:513 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:486
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:527
 __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+0x12f7/0x2750 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 9:
 save_stack+0x23/0x90 mm/kasan/common.c:72
 set_track mm/kasan/common.c:80 [inline]
 kasan_set_free_info mm/kasan/common.c:335 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:474
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:483
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x10a/0x2c0 mm/slab.c:3757
 security_task_free+0x90/0xf0 security/security.c:1520
 __put_task_struct+0xf8/0x530 kernel/fork.c:745
 put_task_struct include/linux/sched/task.h:122 [inline]
 delayed_put_task_struct+0x253/0x3c0 kernel/exit.c:182
 __rcu_reclaim kernel/rcu/rcu.h:222 [inline]
 rcu_do_batch kernel/rcu/tree.c:2183 [inline]
 rcu_core+0x570/0x1540 kernel/rcu/tree.c:2408
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2417
 __do_softirq+0x262/0x98c kernel/softirq.c:292

The buggy address belongs to the object at ffff8880a6a9fc00
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 0 bytes inside of
 64-byte region [ffff8880a6a9fc00, ffff8880a6a9fc40)
The buggy address belongs to the page:
page:ffffea00029aa7c0 refcount:1 mapcount:0 mapping:ffff8880aa400380 index:0x0
raw: 00fffe0000000200 ffffea00026b7388 ffffea000269a208 ffff8880aa400380
raw: 0000000000000000 ffff8880a6a9f000 0000000100000020 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a6a9fb00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8880a6a9fb80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
>ffff8880a6a9fc00: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc
                                        ^
 ffff8880a6a9fc80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
 ffff8880a6a9fd00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
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