device syz4 entered promiscuous mode
==================================================================
BUG: KASAN: use-after-free in __tcp_hdrlen include/linux/tcp.h:35 [inline]
BUG: KASAN: use-after-free in tcp_hdrlen include/linux/tcp.h:40 [inline]
BUG: KASAN: use-after-free in qdisc_pkt_len_init net/core/dev.c:3171 [inline]
BUG: KASAN: use-after-free in __dev_queue_xmit+0x297c/0x2b50 net/core/dev.c:3477
Read of size 2 at addr ffff8801c50cdcf8 by task syz-executor4/5848

CPU: 1 PID: 5848 Comm: syz-executor4 Not tainted 4.15.0-rc6-mm1+ #52
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 print_address_description+0x73/0x250 mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report+0x23b/0x360 mm/kasan/report.c:412
 __asan_report_load2_noabort+0x14/0x20 mm/kasan/report.c:431
 __tcp_hdrlen include/linux/tcp.h:35 [inline]
 tcp_hdrlen include/linux/tcp.h:40 [inline]
 qdisc_pkt_len_init net/core/dev.c:3171 [inline]
 __dev_queue_xmit+0x297c/0x2b50 net/core/dev.c:3477
 dev_queue_xmit+0x17/0x20 net/core/dev.c:3566
 packet_snd net/packet/af_packet.c:2944 [inline]
 packet_sendmsg+0x3aed/0x60b0 net/packet/af_packet.c:2969
 sock_sendmsg_nosec net/socket.c:628 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:638
 sock_write_iter+0x31a/0x5d0 net/socket.c:907
 call_write_iter include/linux/fs.h:1775 [inline]
 new_sync_write fs/read_write.c:469 [inline]
 __vfs_write+0x684/0x970 fs/read_write.c:482
 vfs_write+0x189/0x510 fs/read_write.c:544
 SYSC_write fs/read_write.c:589 [inline]
 SyS_write+0xef/0x220 fs/read_write.c:581
 entry_SYSCALL_64_fastpath+0x23/0x9a
RIP: 0033:0x452ac9
RSP: 002b:00007f205e8b1c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452ac9
RDX: 000000000000008e RSI: 0000000020da2f72 RDI: 0000000000000015
RBP: 000000000000005f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006ee988
R13: 00000000ffffffff R14: 00007f205e8b26d4 R15: 0000000000000000

Allocated by task 5815:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:552
 __do_kmalloc mm/slab.c:3705 [inline]
 __kmalloc+0x162/0x760 mm/slab.c:3714
 kmalloc include/linux/slab.h:520 [inline]
 load_elf_phdrs+0x146/0x200 fs/binfmt_elf.c:441
 load_elf_binary+0x1409/0x4c10 fs/binfmt_elf.c:838
 search_binary_handler+0x142/0x6b0 fs/exec.c:1639
 exec_binprm fs/exec.c:1681 [inline]
 do_execveat_common.isra.30+0x1711/0x22a0 fs/exec.c:1803
 do_execve fs/exec.c:1848 [inline]
 SYSC_execve fs/exec.c:1929 [inline]
 SyS_execve+0x39/0x50 fs/exec.c:1924
 do_syscall_64+0x273/0x920 arch/x86/entry/common.c:285
 return_from_SYSCALL_64+0x0/0x75

Freed by task 5815:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:520
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:527
 __cache_free mm/slab.c:3485 [inline]
 kfree+0xd9/0x260 mm/slab.c:3800
 load_elf_binary+0x24b9/0x4c10 fs/binfmt_elf.c:1110
 search_binary_handler+0x142/0x6b0 fs/exec.c:1639
 exec_binprm fs/exec.c:1681 [inline]
 do_execveat_common.isra.30+0x1711/0x22a0 fs/exec.c:1803
 do_execve fs/exec.c:1848 [inline]
 SYSC_execve fs/exec.c:1929 [inline]
 SyS_execve+0x39/0x50 fs/exec.c:1924
 do_syscall_64+0x273/0x920 arch/x86/entry/common.c:285
 return_from_SYSCALL_64+0x0/0x75

The buggy address belongs to the object at ffff8801c50cdcc0
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 56 bytes inside of
 512-byte region [ffff8801c50cdcc0, ffff8801c50cdec0)
The buggy address belongs to the page:
page:ffffea0007143340 count:1 mapcount:0 mapping:ffff8801c50cd040 index:0xffff8801c50cda40
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801c50cd040 ffff8801c50cda40 0000000100000005
raw: ffffea000713c260 ffffea000715c260 ffff8801dac00940 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c50cdb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801c50cdc00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff8801c50cdc80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
                                                                ^
 ffff8801c50cdd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801c50cdd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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