================================================================== BUG: KASAN: global-out-of-bounds in memcpy include/linux/string.h:348 [inline] BUG: KASAN: global-out-of-bounds in soft_cursor+0x439/0xa30 drivers/video/fbdev/core/softcursor.c:70 Read of size 29 at addr ffffffff87ed5df6 by task syz-executor.1/17118 CPU: 0 PID: 17118 Comm: syz-executor.1 Not tainted 4.19.104-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.cold+0x5/0x20d 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+0x8c/0x2ba mm/kasan/report.c:396 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x123/0x190 mm/kasan/kasan.c:267 memcpy+0x24/0x50 mm/kasan/kasan.c:302 memcpy include/linux/string.h:348 [inline] soft_cursor+0x439/0xa30 drivers/video/fbdev/core/softcursor.c:70 bit_cursor+0x12fc/0x1a60 drivers/video/fbdev/core/bitblit.c:386 fbcon_cursor+0x58a/0x7b0 drivers/video/fbdev/core/fbcon.c:1369 hide_cursor+0x9e/0x300 drivers/tty/vt/vt.c:895 redraw_screen+0x2ee/0x8e0 drivers/tty/vt/vt.c:988 fbcon_do_set_font+0x73a/0xa40 drivers/video/fbdev/core/fbcon.c:2583 fbcon_copy_font+0x12c/0x190 drivers/video/fbdev/core/fbcon.c:2598 con_font_copy drivers/tty/vt/vt.c:4548 [inline] con_font_op+0x69a/0x1250 drivers/tty/vt/vt.c:4563 vt_ioctl+0x1784/0x2530 drivers/tty/vt/vt_ioctl.c:965 tty_ioctl+0x7f3/0x1510 drivers/tty/tty_io.c:2669 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xd5f/0x1380 fs/ioctl.c:688 ksys_ioctl+0xab/0xd0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:710 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c6c9 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:00007f429881ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f429881f6d4 RCX: 000000000045c6c9 RDX: 0000000020000000 RSI: 0000000000004b72 RDI: 0000000000000003 RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000036a R14: 00000000004c5c43 R15: 000000000076bf2c The buggy address belongs to the variable: fontdata_8x16+0x1016/0x1120 Memory state around the buggy address: ffffffff87ed5c80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffffff87ed5d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffffff87ed5d80: 00 00 00 00 00 00 00 00 00 00 00 00 fa fa fa fa ^ ffffffff87ed5e00: 06 fa fa fa fa fa fa fa 05 fa fa fa fa fa fa fa ffffffff87ed5e80: 06 fa fa fa fa fa fa fa 00 00 03 fa fa fa fa fa ==================================================================