================================================================== BUG: KASAN: global-out-of-bounds in fbcon_resize+0x781/0x810 drivers/video/fbdev/core/fbcon.c:2021 Read of size 4 at addr ffffffff8896c258 by task syz-executor.2/1373 CPU: 1 PID: 1373 Comm: syz-executor.2 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+0x781/0x810 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_resizex drivers/tty/vt/vt_ioctl.c:818 [inline] vt_ioctl+0xef0/0x2cc0 drivers/tty/vt/vt_ioctl.c:1036 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:00007f33b48b3c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000019340 RCX: 000000000045d5f9 RDX: 0000000020000100 RSI: 000000000000560a RDI: 0000000000000003 RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007fff01b0fdcf R14: 00007f33b48b49c0 R15: 000000000118cf4c The buggy address belongs to the variable: font_vga_8x16+0x58/0x60 Memory state around the buggy address: ffffffff8896c100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffffff8896c180: 00 00 00 00 f9 f9 f9 f9 00 f9 f9 f9 f9 f9 f9 f9 >ffffffff8896c200: 00 00 00 00 00 f9 f9 f9 f9 f9 f9 f9 00 00 00 00 ^ ffffffff8896c280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffffff8896c300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================