================================================================== BUG: KASAN: vmalloc-out-of-bounds in fast_imageblit drivers/video/fbdev/core/sysimgblt.c:257 [inline] BUG: KASAN: vmalloc-out-of-bounds in sys_imageblit+0x1e04/0x2740 drivers/video/fbdev/core/sysimgblt.c:323 Write of size 4 at addr ffffc90004261000 by task syz-executor.2/5463 CPU: 0 PID: 5463 Comm: syz-executor.2 Not tainted 5.19.0-syzkaller-13930-g7ebfc85e2cd7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description+0x65/0x4b0 mm/kasan/report.c:317 print_report+0x108/0x220 mm/kasan/report.c:433 kasan_report+0xfb/0x130 mm/kasan/report.c:495 fast_imageblit drivers/video/fbdev/core/sysimgblt.c:257 [inline] sys_imageblit+0x1e04/0x2740 drivers/video/fbdev/core/sysimgblt.c:323 drm_fb_helper_sys_imageblit drivers/gpu/drm/drm_fb_helper.c:837 [inline] drm_fbdev_fb_imageblit+0x163/0x300 drivers/gpu/drm/drm_fb_helper.c:2340 bit_putcs+0x19b9/0x1ed0 fbcon_putcs+0x347/0x520 drivers/video/fbdev/core/fbcon.c:1287 do_update_region+0x530/0x740 drivers/tty/vt/vt.c:676 invert_screen+0x48e/0xef0 drivers/tty/vt/vt.c:800 highlight drivers/tty/vt/selection.c:57 [inline] clear_selection+0x55/0x70 drivers/tty/vt/selection.c:85 vc_do_resize+0x724/0x18c0 drivers/tty/vt/vt.c:1257 fbcon_do_set_font+0xac5/0x1330 drivers/video/fbdev/core/fbcon.c:2428 fbcon_set_font+0xc29/0xf70 drivers/video/fbdev/core/fbcon.c:2519 con_font_set drivers/tty/vt/vt.c:4666 [inline] con_font_op+0xbe8/0x1070 drivers/tty/vt/vt.c:4710 vt_k_ioctl drivers/tty/vt/vt_ioctl.c:474 [inline] vt_ioctl+0x172e/0x1d00 drivers/tty/vt/vt_ioctl.c:752 tty_ioctl+0x874/0xc60 drivers/tty/tty_io.c:2778 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fa2f8489279 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa2f955d168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fa2f859c120 RCX: 00007fa2f8489279 RDX: 0000000020000440 RSI: 0000000000004b72 RDI: 0000000000000005 RBP: 00007fa2f84e3189 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc43e2c48f R14: 00007fa2f955d300 R15: 0000000000022000 The buggy address belongs to the virtual mapping at [ffffc90003f61000, ffffc90004262000) created by: drm_gem_shmem_vmap_locked drivers/gpu/drm/drm_gem_shmem_helper.c:319 [inline] drm_gem_shmem_vmap+0x391/0x4d0 drivers/gpu/drm/drm_gem_shmem_helper.c:366 Memory state around the buggy address: ffffc90004260f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc90004260f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffc90004261000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ^ ffffc90004261080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffffc90004261100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ==================================================================