================================================================== BUG: KASAN: global-out-of-bounds in __fb_pad_aligned_buffer include/linux/fb.h:663 [inline] BUG: KASAN: global-out-of-bounds in fb_pad_aligned_buffer+0xf1/0x110 drivers/video/fbdev/core/fbmem.c:122 Read of size 1 at addr ffffffff86e6aa9a by task syz-executor.1/529 CPU: 1 PID: 529 Comm: syz-executor.1 Not tainted 4.14.196-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x283 lib/dump_stack.c:58 print_address_description.cold+0x5/0x1d3 mm/kasan/report.c:252 kasan_report_error.cold+0x8a/0x194 mm/kasan/report.c:351 kasan_report mm/kasan/report.c:409 [inline] __asan_report_load1_noabort+0x68/0x70 mm/kasan/report.c:427 __fb_pad_aligned_buffer include/linux/fb.h:663 [inline] fb_pad_aligned_buffer+0xf1/0x110 drivers/video/fbdev/core/fbmem.c:122 bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:99 [inline] bit_putcs+0x933/0xc30 drivers/video/fbdev/core/bitblit.c:185 fbcon_putcs+0x2fe/0x480 drivers/video/fbdev/core/fbcon.c:1301 do_update_region+0x34b/0x5b0 drivers/tty/vt/vt.c:373 redraw_screen+0x56e/0x790 drivers/tty/vt/vt.c:705 fbcon_do_set_font+0x6c3/0x9a0 drivers/video/fbdev/core/fbcon.c:2585 fbcon_copy_font+0x125/0x190 drivers/video/fbdev/core/fbcon.c:2600 con_font_copy drivers/tty/vt/vt.c:4246 [inline] con_font_op+0x58b/0xf60 drivers/tty/vt/vt.c:4261 vt_ioctl+0x127b/0x1f50 drivers/tty/vt/vt_ioctl.c:990 tty_ioctl+0x50f/0x13c0 drivers/tty/tty_io.c:2661 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45d5b9 RSP: 002b:00007f0b9de5cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000010380 RCX: 000000000045d5b9 RDX: 0000000020000b40 RSI: 0000000000004b72 RDI: 0000000000000003 RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007ffdaa72e68f R14: 00007f0b9de5d9c0 R15: 000000000118cf4c The buggy address belongs to the variable: oid_index+0x49a/0x9a0 Memory state around the buggy address: ffffffff86e6a980: fa fa fa fa 00 07 fa fa fa fa fa fa 00 07 fa fa ffffffff86e6aa00: fa fa fa fa 06 fa fa fa fa fa fa fa 00 00 00 04 >ffffffff86e6aa80: fa fa fa fa 00 00 fa fa fa fa fa fa 00 00 01 fa ^ ffffffff86e6ab00: fa fa fa fa 00 00 00 00 fa fa fa fa 00 00 00 fa ffffffff86e6ab80: fa fa fa fa 00 00 00 00 fa fa fa fa 04 fa fa fa ==================================================================