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BUG: KASAN: use-after-free in soft_cursor+0x378/0x6bc drivers/video/fbdev/core/softcursor.c:70
Read of size 48 at addr ffff0000d02d9150 by task syz.3.481/5967

CPU: 0 UID: 0 PID: 5967 Comm: syz.3.481 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 print_address_description+0xb0/0x238 mm/kasan/report.c:378
 print_report+0x68/0x84 mm/kasan/report.c:482
 kasan_report+0x8c/0xc4 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x17c/0x1ac mm/kasan/generic.c:200
 __asan_memcpy+0x3c/0x84 mm/kasan/shadow.c:105
 soft_cursor+0x378/0x6bc drivers/video/fbdev/core/softcursor.c:70
 cw_cursor+0xb18/0x11e4 drivers/video/fbdev/core/fbcon_cw.c:324
 fbcon_cursor+0x344/0x498 drivers/video/fbdev/core/fbcon.c:1427
 hide_cursor+0xdc/0x2d0 drivers/tty/vt/vt.c:883
 redraw_screen+0x200/0x51c drivers/tty/vt/vt.c:985
 vc_do_resize+0x884/0xbbc drivers/tty/vt/vt.c:1309
 __vc_resize+0x60/0x74 drivers/tty/vt/vt.c:1331
 vc_resize include/linux/vt_kern.h:49 [inline]
 fbcon_do_set_font+0x3d8/0x734 drivers/video/fbdev/core/fbcon.c:2435
 fbcon_set_font+0x4f0/0x6ac drivers/video/fbdev/core/fbcon.c:2518
 con_font_set drivers/tty/vt/vt.c:4992 [inline]
 con_font_op+0x98c/0xc6c drivers/tty/vt/vt.c:5032
 vt_k_ioctl drivers/tty/vt/vt_ioctl.c:474 [inline]
 vt_ioctl+0x1664/0x1d4c drivers/tty/vt/vt_ioctl.c:747
 tty_ioctl+0x828/0xcb0 drivers/tty/tty_io.c:2765
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __arm64_sys_ioctl+0x154/0x1cc fs/ioctl.c:583
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758
 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffffffffffffffff pfn:0x1102d9
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 0000000000000000 00000000ffffffff 0000000000000000
raw: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000d02d9000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000d02d9080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff0000d02d9100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                 ^
 ffff0000d02d9180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000d02d9200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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