================================================================== BUG: KASAN: global-out-of-bounds in fbcon_resize+0x7a0/0x870 drivers/video/fbdev/core/fbcon.c:2021 Read of size 4 at addr ffffffff88b76e18 by task syz-executor.5/19225 CPU: 0 PID: 19225 Comm: syz-executor.5 Not tainted 5.9.0-rc5-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+0x198/0x1fd lib/dump_stack.c:118 print_address_description.constprop.0.cold+0x5/0x497 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530 fbcon_resize+0x7a0/0x870 drivers/video/fbdev/core/fbcon.c:2021 resize_screen drivers/tty/vt/vt.c:1175 [inline] vc_do_resize+0x535/0x1150 drivers/tty/vt/vt.c:1246 vt_ioctl+0x10c6/0x2e90 drivers/tty/vt/vt_ioctl.c:1025 tty_ioctl+0x1019/0x15f0 drivers/tty/tty_io.c:2656 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d5f9 Code: 5d b4 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 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f59db7cec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000001d140 RCX: 000000000045d5f9 RDX: 0000000020000300 RSI: 0000000000005609 RDI: 0000000000000003 RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007ffc2ad3573f R14: 00007f59db7cf9c0 R15: 000000000118cf4c The buggy address belongs to the variable: font_vga_8x16+0x58/0x60 Memory state around the buggy address: ffffffff88b76d00: 00 00 00 00 00 00 00 00 00 00 00 00 f9 f9 f9 f9 ffffffff88b76d80: 00 f9 f9 f9 f9 f9 f9 f9 00 00 00 00 00 f9 f9 f9 >ffffffff88b76e00: f9 f9 f9 f9 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffffffff88b76e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffffff88b76f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================