================================================================== BUG: KASAN: global-out-of-bounds in __fb_pad_aligned_buffer include/linux/fb.h:654 [inline] BUG: KASAN: global-out-of-bounds in bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline] BUG: KASAN: global-out-of-bounds in bit_putcs+0xbb6/0xd20 drivers/video/fbdev/core/bitblit.c:185 Read of size 1 at addr ffffffff8896e2a4 by task syz-executor.0/31883 CPU: 0 PID: 31883 Comm: syz-executor.0 Not tainted 5.9.0-rc4-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 __fb_pad_aligned_buffer include/linux/fb.h:654 [inline] bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline] bit_putcs+0xbb6/0xd20 drivers/video/fbdev/core/bitblit.c:185 fbcon_putcs+0x33c/0x3f0 drivers/video/fbdev/core/fbcon.c:1362 do_update_region+0x399/0x630 drivers/tty/vt/vt.c:675 redraw_screen+0x64e/0x770 drivers/tty/vt/vt.c:1034 fbcon_do_set_font+0x7ec/0x950 drivers/video/fbdev/core/fbcon.c:2636 fbcon_copy_font+0x125/0x190 drivers/video/fbdev/core/fbcon.c:2651 con_font_copy drivers/tty/vt/vt.c:4719 [inline] con_font_op+0x65a/0x1110 drivers/tty/vt/vt.c:4734 vt_k_ioctl drivers/tty/vt/vt_ioctl.c:473 [inline] vt_ioctl+0x2141/0x2cc0 drivers/tty/vt/vt_ioctl.c:852 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: 0033:0x45d5b9 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:00007ffa3637cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000010380 RCX: 000000000045d5b9 RDX: 00000000200001c0 RSI: 0000000000004b72 RDI: 0000000000000004 RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007fff599c1a5f R14: 00007ffa3637d9c0 R15: 000000000118cf4c The buggy address belongs to the variable: __func__.0+0x104/0x1c0 Memory state around the buggy address: ffffffff8896e180: f9 f9 f9 f9 00 03 f9 f9 f9 f9 f9 f9 00 01 f9 f9 ffffffff8896e200: f9 f9 f9 f9 04 f9 f9 f9 f9 f9 f9 f9 04 f9 f9 f9 >ffffffff8896e280: f9 f9 f9 f9 04 f9 f9 f9 f9 f9 f9 f9 04 f9 f9 f9 ^ ffffffff8896e300: f9 f9 f9 f9 07 f9 f9 f9 f9 f9 f9 f9 04 f9 f9 f9 ffffffff8896e380: f9 f9 f9 f9 00 04 f9 f9 f9 f9 f9 f9 00 02 f9 f9 ==================================================================