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BUG: KASAN: slab-out-of-bounds in scr_memcpyw include/linux/vt_buffer.h:49 [inline]
BUG: KASAN: slab-out-of-bounds in vc_do_resize+0xe3e/0x1ce0 drivers/tty/vt/vt.c:1280
Read of size 4 at addr ffff8880a70d49c2 by task syz-executor.2/11049

CPU: 1 PID: 11049 Comm: syz-executor.2 Not tainted 5.8.0-rc3-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+0x1f0/0x31e lib/dump_stack.c:118
 print_address_description+0x66/0x5a0 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report+0x132/0x1d0 mm/kasan/report.c:530
 check_memory_region_inline mm/kasan/generic.c:183 [inline]
 check_memory_region+0x2b5/0x2f0 mm/kasan/generic.c:192
 memcpy+0x25/0x60 mm/kasan/common.c:105
 scr_memcpyw include/linux/vt_buffer.h:49 [inline]
 vc_do_resize+0xe3e/0x1ce0 drivers/tty/vt/vt.c:1280
 fbcon_modechanged+0x710/0xd90 drivers/video/fbdev/core/fbcon.c:2990
 fb_set_var+0x825/0xcc0 drivers/video/fbdev/core/fbmem.c:1056
 do_fb_ioctl+0x502/0x6f0 drivers/video/fbdev/core/fbmem.c:1109
 vfs_ioctl fs/ioctl.c:48 [inline]
 ksys_ioctl fs/ioctl.c:753 [inline]
 __do_sys_ioctl fs/ioctl.c:762 [inline]
 __se_sys_ioctl+0xf9/0x160 fs/ioctl.c:760
 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cb29
Code: Bad RIP value.
RSP: 002b:00007ff637d7dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e55a0 RCX: 000000000045cb29
RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000003
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000002fd R14: 00000000004c58a5 R15: 00007ff637d7e6d4

Allocated by task 11049:
 save_stack mm/kasan/common.c:48 [inline]
 set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc+0x103/0x140 mm/kasan/common.c:494
 __do_kmalloc mm/slab.c:3656 [inline]
 __kmalloc+0x24b/0x330 mm/slab.c:3665
 kmalloc include/linux/slab.h:560 [inline]
 kzalloc+0x1d/0x40 include/linux/slab.h:669
 vc_do_resize+0x2a0/0x1ce0 drivers/tty/vt/vt.c:1217
 fbcon_modechanged+0x710/0xd90 drivers/video/fbdev/core/fbcon.c:2990
 fb_set_var+0x825/0xcc0 drivers/video/fbdev/core/fbmem.c:1056
 fbcon_resize+0x7bb/0xff0 drivers/video/fbdev/core/fbcon.c:2231
 resize_screen drivers/tty/vt/vt.c:1156 [inline]
 vc_do_resize+0x70a/0x1ce0 drivers/tty/vt/vt.c:1235
 fbcon_modechanged+0x710/0xd90 drivers/video/fbdev/core/fbcon.c:2990
 fb_set_var+0x825/0xcc0 drivers/video/fbdev/core/fbmem.c:1056
 do_fb_ioctl+0x502/0x6f0 drivers/video/fbdev/core/fbmem.c:1109
 vfs_ioctl fs/ioctl.c:48 [inline]
 ksys_ioctl fs/ioctl.c:753 [inline]
 __do_sys_ioctl fs/ioctl.c:762 [inline]
 __se_sys_ioctl+0xf9/0x160 fs/ioctl.c:760
 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 10366:
 save_stack mm/kasan/common.c:48 [inline]
 set_track mm/kasan/common.c:56 [inline]
 kasan_set_free_info mm/kasan/common.c:316 [inline]
 __kasan_slab_free+0x114/0x170 mm/kasan/common.c:455
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x10a/0x220 mm/slab.c:3757
 skb_release_all net/core/skbuff.c:664 [inline]
 __kfree_skb+0x56/0x1c0 net/core/skbuff.c:678
 skb_queue_purge+0x131/0x1c0 net/core/skbuff.c:3077
 packet_release+0xa6c/0xbd0 net/packet/af_packet.c:3075
 __sock_release net/socket.c:605 [inline]
 sock_close+0xd8/0x260 net/socket.c:1278
 __fput+0x2f0/0x750 fs/file_table.c:281
 task_work_run+0x137/0x1c0 kernel/task_work.c:123
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop arch/x86/entry/common.c:216 [inline]
 __prepare_exit_to_usermode+0x14c/0x1e0 arch/x86/entry/common.c:246
 do_syscall_64+0x7f/0xe0 arch/x86/entry/common.c:368
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff8880a70d4800
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 450 bytes inside of
 512-byte region [ffff8880a70d4800, ffff8880a70d4a00)
The buggy address belongs to the page:
page:ffffea00029c3500 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880a70d4c00
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea00028b0e88 ffffea000243d2c8 ffff8880aa400a80
raw: ffff8880a70d4c00 ffff8880a70d4000 0000000100000003 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a70d4880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880a70d4900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880a70d4980: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
                                           ^
 ffff8880a70d4a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880a70d4a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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