================================================================== BUG: KASAN: vmalloc-out-of-bounds in fast_imageblit drivers/video/fbdev/core/sysimgblt.c:229 [inline] BUG: KASAN: vmalloc-out-of-bounds in sys_imageblit+0x117f/0x1290 drivers/video/fbdev/core/sysimgblt.c:275 Write of size 4 at addr ffffc9000b461000 by task syz-executor.1/14875 CPU: 3 PID: 14875 Comm: syz-executor.1 Not tainted 5.10.0-rc3-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:118 print_address_description.constprop.0.cold+0x5/0x497 mm/kasan/report.c:385 __kasan_report mm/kasan/report.c:545 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:562 fast_imageblit drivers/video/fbdev/core/sysimgblt.c:229 [inline] sys_imageblit+0x117f/0x1290 drivers/video/fbdev/core/sysimgblt.c:275 drm_fb_helper_sys_imageblit+0x1c/0x180 drivers/gpu/drm/drm_fb_helper.c:767 bit_putcs_unaligned drivers/video/fbdev/core/bitblit.c:139 [inline] bit_putcs+0x6e1/0xd20 drivers/video/fbdev/core/bitblit.c:188 fbcon_putcs+0x35a/0x450 drivers/video/fbdev/core/fbcon.c:1306 do_update_region+0x399/0x630 drivers/tty/vt/vt.c:676 redraw_screen+0x658/0x790 drivers/tty/vt/vt.c:1035 vc_do_resize+0xed8/0x1150 drivers/tty/vt/vt.c:1326 fbcon_do_set_font+0x48e/0x880 drivers/video/fbdev/core/fbcon.c:2442 fbcon_set_font+0x7c9/0x9b0 drivers/video/fbdev/core/fbcon.c:2537 con_font_set drivers/tty/vt/vt.c:4667 [inline] con_font_op+0x947/0xf20 drivers/tty/vt/vt.c:4711 vt_k_ioctl drivers/tty/vt/vt_ioctl.c:472 [inline] vt_ioctl+0x1db8/0x2950 drivers/tty/vt/vt_ioctl.c:813 tty_ioctl+0x1021/0x1600 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: 0033:0x45da59 Code: bd b1 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 8b b1 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f7407792c88 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000702ce0 RCX: 000000000045da59 RDX: 0000000020000440 RSI: 0000000000004b72 RDI: 0000000000000003 RBP: 00000000004aab8b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000075bf00 R13: 00007ffd3c4f1a2f R14: 00007f7407773000 R15: 0000000000000003 Memory state around the buggy address: ffffc9000b460f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc9000b460f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffc9000b461000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ^ ffffc9000b461080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffffc9000b461100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ==================================================================