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BUG: KASAN: vmalloc-out-of-bounds in fb_write_offset drivers/video/fbdev/core/sysmem.h:30 [inline]
BUG: KASAN: vmalloc-out-of-bounds in fb_bitmap_2ppw drivers/video/fbdev/core/fb_imageblit.h:364 [inline]
BUG: KASAN: vmalloc-out-of-bounds in fb_bitmap_imageblit drivers/video/fbdev/core/fb_imageblit.h:462 [inline]
BUG: KASAN: vmalloc-out-of-bounds in fb_imageblit drivers/video/fbdev/core/fb_imageblit.h:492 [inline]
BUG: KASAN: vmalloc-out-of-bounds in sys_imageblit+0xfe2/0x1e50 drivers/video/fbdev/core/sysimgblt.c:22
Write of size 8 at addr ffffc90001d51000 by task syz.0.0/5325

CPU: 0 UID: 0 PID: 5325 Comm: syz.0.0 Not tainted 6.16.0-rc3-syzkaller-00044-g7595b66ae9de #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:408 [inline]
 print_report+0xd2/0x2b0 mm/kasan/report.c:521
 kasan_report+0x118/0x150 mm/kasan/report.c:634
 fb_write_offset drivers/video/fbdev/core/sysmem.h:30 [inline]
 fb_bitmap_2ppw drivers/video/fbdev/core/fb_imageblit.h:364 [inline]
 fb_bitmap_imageblit drivers/video/fbdev/core/fb_imageblit.h:462 [inline]
 fb_imageblit drivers/video/fbdev/core/fb_imageblit.h:492 [inline]
 sys_imageblit+0xfe2/0x1e50 drivers/video/fbdev/core/sysimgblt.c:22
 drm_fbdev_shmem_defio_imageblit+0x2c/0x110 drivers/gpu/drm/drm_fbdev_shmem.c:37
 bit_putcs+0x1760/0x1a50 drivers/video/fbdev/core/bitblit.c:-1
 fbcon_putcs+0x3e5/0x5f0 drivers/video/fbdev/core/fbcon.c:1314
 do_update_region+0x38b/0x440 drivers/tty/vt/vt.c:627
 invert_screen+0x860/0x9f0 drivers/tty/vt/vt.c:748
 highlight drivers/tty/vt/selection.c:57 [inline]
 clear_selection+0x59/0x80 drivers/tty/vt/selection.c:87
 vc_do_resize+0x471/0x1770 drivers/tty/vt/vt.c:1195
 vc_resize include/linux/vt_kern.h:49 [inline]
 fbcon_set_disp+0x9ec/0xf80 drivers/video/fbdev/core/fbcon.c:1415
 con2fb_init_display drivers/video/fbdev/core/fbcon.c:816 [inline]
 set_con2fb_map+0xb53/0x13c0 drivers/video/fbdev/core/fbcon.c:889
 fbcon_set_con2fb_map_ioctl+0x18a/0x1f0 drivers/video/fbdev/core/fbcon.c:3118
 do_fb_ioctl+0x3df/0x750 drivers/video/fbdev/core/fb_chrdev.c:138
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6cba78e929
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6cbb58d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f6cba9b6080 RCX: 00007f6cba78e929
RDX: 00002000000000c0 RSI: 0000000000004610 RDI: 0000000000000005
RBP: 00007f6cba810b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f6cba9b6080 R15: 00007ffc03c025a8
 </TASK>

The buggy address belongs to the virtual mapping at
 [ffffc90001a51000, ffffc90001d52000) created by:
 drm_gem_shmem_vmap_locked+0x488/0x670 drivers/gpu/drm/drm_gem_shmem_helper.c:369

Memory state around the buggy address:
 ffffc90001d50f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc90001d50f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc90001d51000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
                   ^
 ffffc90001d51080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
 ffffc90001d51100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
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