binder: 15357:15372 unknown command 517942196
binder: 15357:15372 ioctl c0306201 20000300 returned -22
==================================================================
BUG: KASAN: slab-out-of-bounds in skb_headlen include/linux/skbuff.h:1898 [inline]
BUG: KASAN: slab-out-of-bounds in pskb_may_pull include/linux/skbuff.h:2112 [inline]
BUG: KASAN: slab-out-of-bounds in skb_ensure_writable+0x290/0x2e0 net/core/skbuff.c:5020
Read of size 4 at addr ffff8801d432f378 by task syz-executor5/15389

CPU: 0 PID: 15389 Comm: syz-executor5 Not tainted 4.14.81+ #6
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xb9/0x11b lib/dump_stack.c:53
 print_address_description+0x60/0x22b mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report.cold.6+0x11b/0x2dd mm/kasan/report.c:409
 skb_headlen include/linux/skbuff.h:1898 [inline]
 pskb_may_pull include/linux/skbuff.h:2112 [inline]
 skb_ensure_writable+0x290/0x2e0 net/core/skbuff.c:5020
 __bpf_try_make_writable net/core/filter.c:1403 [inline]
 bpf_try_make_writable net/core/filter.c:1409 [inline]
 ____bpf_l3_csum_replace net/core/filter.c:1530 [inline]
 bpf_l3_csum_replace+0x5f/0x340 net/core/filter.c:1521
 ___bpf_prog_run+0x248e/0x5c70 kernel/bpf/core.c:1012

Allocated by task 13699:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc.part.1+0x4f/0xd0 mm/kasan/kasan.c:551
 slab_post_alloc_hook mm/slab.h:442 [inline]
 slab_alloc_node mm/slub.c:2723 [inline]
 slab_alloc mm/slub.c:2731 [inline]
 kmem_cache_alloc+0xe4/0x2b0 mm/slub.c:2736
 kmem_cache_alloc_node include/linux/slab.h:361 [inline]
 __alloc_skb+0xd8/0x550 net/core/skbuff.c:193
 alloc_skb include/linux/skbuff.h:980 [inline]
 alloc_skb_with_frags+0xab/0x500 net/core/skbuff.c:5168
 sock_alloc_send_pskb+0x55e/0x6e0 net/core/sock.c:2075
 __ip6_append_data.isra.3+0x1698/0x2940 net/ipv6/ip6_output.c:1417
 ip6_make_skb+0x24d/0x420 net/ipv6/ip6_output.c:1766
 udpv6_sendmsg+0x1ecf/0x2510 net/ipv6/udp.c:1347
 inet_sendmsg+0x168/0x540 net/ipv4/af_inet.c:781
 sock_sendmsg_nosec net/socket.c:645 [inline]
 sock_sendmsg+0xb5/0x100 net/socket.c:655
 ___sys_sendmsg+0x41d/0x890 net/socket.c:2061
 __sys_sendmmsg+0x13d/0x360 net/socket.c:2151
 SYSC_sendmmsg net/socket.c:2182 [inline]
 SyS_sendmmsg+0x2f/0x50 net/socket.c:2177
 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

Freed by task 13753:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0xac/0x190 mm/kasan/kasan.c:524
 slab_free_hook mm/slub.c:1389 [inline]
 slab_free_freelist_hook mm/slub.c:1410 [inline]
 slab_free mm/slub.c:2966 [inline]
 kmem_cache_free+0x12d/0x350 mm/slub.c:2988
 kfree_skbmem+0x9e/0x100 net/core/skbuff.c:582
 __kfree_skb net/core/skbuff.c:642 [inline]
 consume_skb+0xc9/0x330 net/core/skbuff.c:701
 tun_do_read+0x507/0x12f0 drivers/net/tun.c:1765
 tun_chr_read_iter+0xd8/0x1c0 drivers/net/tun.c:1779
 call_read_iter include/linux/fs.h:1776 [inline]
 new_sync_read fs/read_write.c:401 [inline]
 __vfs_read+0x414/0x5b0 fs/read_write.c:413
 vfs_read+0x11e/0x330 fs/read_write.c:447
 SYSC_read fs/read_write.c:577 [inline]
 SyS_read+0xc2/0x1a0 fs/read_write.c:570
 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

The buggy address belongs to the object at ffff8801d432f280
 which belongs to the cache skbuff_head_cache of size 224
The buggy address is located 24 bytes to the right of
 224-byte region [ffff8801d432f280, ffff8801d432f360)
The buggy address belongs to the page:
page:ffffea000750cbc0 count:1 mapcount:0 mapping:          (null) index:0x0
flags: 0x4000000000000100(slab)
raw: 4000000000000100 0000000000000000 0000000000000000 00000001800c000c
raw: dead000000000100 dead000000000200 ffff8801dab70200 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801d432f200: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801d432f280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8801d432f300: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
                                                                ^
 ffff8801d432f380: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
 ffff8801d432f400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================