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BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:348 [inline]
BUG: KASAN: slab-out-of-bounds in soft_cursor+0x448/0xa20 drivers/video/fbdev/core/softcursor.c:70
Read of size 9 at addr ffff88803ae4ff7e by task syz-executor.5/25351

CPU: 1 PID: 25351 Comm: syz-executor.5 Not tainted 4.19.113-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+0x188/0x20d lib/dump_stack.c:118
 print_address_description.cold+0x7c/0x212 mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report mm/kasan/report.c:412 [inline]
 kasan_report.cold+0x88/0x2b9 mm/kasan/report.c:396
 memcpy+0x20/0x50 mm/kasan/kasan.c:302
 memcpy include/linux/string.h:348 [inline]
 soft_cursor+0x448/0xa20 drivers/video/fbdev/core/softcursor.c:70
 bit_cursor+0x1230/0x1900 drivers/video/fbdev/core/bitblit.c:386
 fbcon_cursor+0x572/0x760 drivers/video/fbdev/core/fbcon.c:1369
 hide_cursor+0x99/0x2f0 drivers/tty/vt/vt.c:895
 redraw_screen+0x2ed/0x870 drivers/tty/vt/vt.c:999
 vc_do_resize+0x109e/0x13a0 drivers/tty/vt/vt.c:1298
 vt_ioctl+0x1dff/0x2310 drivers/tty/vt/vt_ioctl.c:891
 tty_ioctl+0x7a1/0x1420 drivers/tty/tty_io.c:2669
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xcda/0x12e0 fs/ioctl.c:688
 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c849
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:00007fab22658c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fab226596d4 RCX: 000000000045c849
RDX: 0000000020000040 RSI: 000000000000560a RDI: 0000000000000004
RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000066a R14: 00000000004c93e6 R15: 000000000076bf0c

Allocated by task 24362:
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc mm/kasan/kasan.c:553 [inline]
 kasan_kmalloc+0xbf/0xe0 mm/kasan/kasan.c:531
 __do_kmalloc mm/slab.c:3727 [inline]
 __kmalloc+0x15b/0x770 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 fbcon_set_font+0x331/0x870 drivers/video/fbdev/core/fbcon.c:2641
 con_font_set drivers/tty/vt/vt.c:4501 [inline]
 con_font_op+0xd3e/0x1130 drivers/tty/vt/vt.c:4566
 do_fontx_ioctl drivers/tty/vt/vt_ioctl.c:244 [inline]
 vt_ioctl+0x341/0x2310 drivers/tty/vt/vt_ioctl.c:935
 tty_ioctl+0x7a1/0x1420 drivers/tty/tty_io.c:2669
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xcda/0x12e0 fs/ioctl.c:688
 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 8107:
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0xf7/0x140 mm/kasan/kasan.c:521
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xce/0x220 mm/slab.c:3822
 skb_free_head+0x91/0xb0 net/core/skbuff.c:554
 skb_release_data+0x600/0x8c0 net/core/skbuff.c:574
 skb_release_all+0x46/0x60 net/core/skbuff.c:631
 __kfree_skb net/core/skbuff.c:645 [inline]
 consume_skb net/core/skbuff.c:705 [inline]
 consume_skb+0xda/0x380 net/core/skbuff.c:699
 __dev_kfree_skb_any+0x9c/0xc0 net/core/dev.c:2800
 dev_consume_skb_any include/linux/netdevice.h:3538 [inline]
 napi_consume_skb+0x3e1/0x550 net/core/skbuff.c:769
 free_old_xmit_skbs+0xdc/0x240 drivers/net/virtio_net.c:1377
 start_xmit+0x14a/0x1690 drivers/net/virtio_net.c:1573
 __netdev_start_xmit include/linux/netdevice.h:4314 [inline]
 netdev_start_xmit include/linux/netdevice.h:4323 [inline]
 xmit_one net/core/dev.c:3258 [inline]
 dev_hard_start_xmit+0x1a4/0x950 net/core/dev.c:3274
 sch_direct_xmit+0x345/0xfc0 net/sched/sch_generic.c:332
 qdisc_restart net/sched/sch_generic.c:395 [inline]
 __qdisc_run+0x4df/0x1720 net/sched/sch_generic.c:403
 qdisc_run include/net/pkt_sched.h:120 [inline]
 qdisc_run include/net/pkt_sched.h:117 [inline]
 __dev_xmit_skb net/core/dev.c:3453 [inline]
 __dev_queue_xmit+0x229a/0x3040 net/core/dev.c:3812
 neigh_hh_output include/net/neighbour.h:491 [inline]
 neigh_output include/net/neighbour.h:499 [inline]
 ip_finish_output2+0x104d/0x1740 net/ipv4/ip_output.c:229
 ip_finish_output+0x721/0xcd0 net/ipv4/ip_output.c:317
 NF_HOOK_COND include/linux/netfilter.h:278 [inline]
 ip_output+0x1fb/0x5f0 net/ipv4/ip_output.c:405
 dst_output include/net/dst.h:447 [inline]
 ip_local_out+0xaf/0x170 net/ipv4/ip_output.c:124
 __ip_queue_xmit+0x85a/0x1bc0 net/ipv4/ip_output.c:505
 __tcp_transmit_skb+0x19d5/0x3750 net/ipv4/tcp_output.c:1146
 tcp_transmit_skb net/ipv4/tcp_output.c:1162 [inline]
 tcp_write_xmit+0x1409/0x5230 net/ipv4/tcp_output.c:2387
 __tcp_push_pending_frames+0xaa/0x260 net/ipv4/tcp_output.c:2563
 tcp_push+0x4c2/0x6c0 net/ipv4/tcp.c:735
 tcp_sendmsg_locked+0x271b/0x2ff0 net/ipv4/tcp.c:1422
 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1452
 inet_sendmsg+0x12e/0x590 net/ipv4/af_inet.c:798
 sock_sendmsg_nosec net/socket.c:622 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:632
 sock_write_iter+0x283/0x3c0 net/socket.c:901
 call_write_iter include/linux/fs.h:1821 [inline]
 new_sync_write fs/read_write.c:474 [inline]
 __vfs_write+0x512/0x760 fs/read_write.c:487
 vfs_write+0x206/0x550 fs/read_write.c:549
 ksys_write+0x12b/0x2a0 fs/read_write.c:599
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff88803ae4f680
 which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 254 bytes to the right of
 2048-byte region [ffff88803ae4f680, ffff88803ae4fe80)
The buggy address belongs to the page:
page:ffffea0000eb9380 count:1 mapcount:0 mapping:ffff88812c3dcc40 index:0xffff88803ae4ee00 compound_mapcount: 0
flags: 0xfffe0000008100(slab|head)
raw: 00fffe0000008100 ffffea00011ffa08 ffffea0002743808 ffff88812c3dcc40
raw: ffff88803ae4ee00 ffff88803ae4e580 0000000100000002 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88803ae4fe00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88803ae4fe80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88803ae4ff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                                                ^
 ffff88803ae4ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88803ae50000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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