BUG: unable to handle kernel paging request in cfb_imageblit

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: c37da90e Linux 4.19.143
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=16f7bd3e900000
kernel config: https://syzkaller.appspot.com/x/.config?x=d162ec57805c4e4d
dashboard link: https://syzkaller.appspot.com/bug?extid=d2aff3a642e5b1a163c2
compiler: gcc (GCC) 10.1.0-syz 20200507
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=154910f1900000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14e2bbcd900000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d2aff3...@syzkaller.appspotmail.com

BUG: unable to handle kernel paging request at 0000000000137408
PGD 100067 P4D 100067 PUD 101067 PMD 0
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 9875 Comm: syz-executor373 Not tainted 4.19.143-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__writel arch/x86/include/asm/io.h:71 [inline]
RIP: 0010:slow_imageblit drivers/video/fbdev/core/cfbimgblt.c:178 [inline]
RIP: 0010:cfb_imageblit+0x99b/0x1040 drivers/video/fbdev/core/cfbimgblt.c:302
Code: e0 09 44 24 04 e8 35 a4 e7 fd 45 39 e7 0f 87 44 ff ff ff e8 37 a3 e7 fd 48 8b 44 24 08 8b 4c 24 04 48 8d 78 04 48 89 7c 24 08 <89> 08 44 89 e6 44 89 ff e8 08 a4 e7 fd 45 39 e7 0f 85 04 ff ff ff
RSP: 0018:ffff888000137160 EFLAGS: 00010293
RAX: 0000000000137408 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff83820e99 RDI: 000000000013740c
RBP: 0000000000000000 R08: ffff8880a5748f7f R09: 000000000000001c
R10: 0000000000000004 R11: 0000000000000000 R12: 000000000000001c
R13: 0000000000000000 R14: ffff8880a5748f72 R15: 000000000000001c
FS: 00007f48dc3f7700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000137408 CR3: 000000000005f000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
vga_imageblit_expand drivers/video/fbdev/vga16fb.c:1207 [inline]
vga16fb_imageblit+0x6b4/0x2260 drivers/video/fbdev/vga16fb.c:1260
soft_cursor+0x514/0xa30 drivers/video/fbdev/core/softcursor.c:74
bit_cursor+0x1239/0x1820 drivers/video/fbdev/core/bitblit.c:386
fbcon_cursor+0x555/0x760 drivers/video/fbdev/core/fbcon.c:1372
set_cursor drivers/tty/vt/vt.c:915 [inline]
set_cursor+0x1dd/0x230 drivers/tty/vt/vt.c:906
con_flush_chars drivers/tty/vt/vt.c:3225 [inline]
con_flush_chars drivers/tty/vt/vt.c:3214 [inline]
con_write+0x8f/0xb0 drivers/tty/vt/vt.c:3146
do_output_char+0x5de/0x850 drivers/tty/n_tty.c:445
process_output drivers/tty/n_tty.c:512 [inline]
n_tty_write+0x46e/0xff0 drivers/tty/n_tty.c:2343
do_tty_write drivers/tty/tty_io.c:960 [inline]
tty_write+0x496/0x810 drivers/tty/tty_io.c:1044
__vfs_write+0xf7/0x770 fs/read_write.c:485
__kernel_write+0x109/0x370 fs/read_write.c:506
write_pipe_buf+0x153/0x1f0 fs/splice.c:798
splice_from_pipe_feed fs/splice.c:503 [inline]
__splice_from_pipe+0x389/0x800 fs/splice.c:627
splice_from_pipe fs/splice.c:662 [inline]
default_file_splice_write+0xd8/0x180 fs/splice.c:810
do_splice_from fs/splice.c:852 [inline]
direct_splice_actor+0x115/0x160 fs/splice.c:1025
splice_direct_to_actor+0x33f/0x8d0 fs/splice.c:980
do_splice_direct+0x1a7/0x270 fs/splice.c:1068
do_sendfile+0x550/0xc30 fs/read_write.c:1447
__do_sys_sendfile64 fs/read_write.c:1508 [inline]
__se_sys_sendfile64+0x147/0x160 fs/read_write.c:1494
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x446ad9
Code: e8 9c b4 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 8b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f48dc3f6d18 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00000000006dbc58 RCX: 0000000000446ad9
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004
RBP: 00000000006dbc50 R08: 65732f636f72702f R09: 65732f636f72702f
R10: 0800000080004103 R11: 0000000000000246 R12: 00000000006dbc5c
R13: 00007f48dc3f6d20 R14: 00007f48dc3f6d20 R15: 20c49ba5e353f7cf
Modules linked in:
CR2: 0000000000137408
---[ end trace 722a8ad8a5d4be3b ]---
RIP: 0010:__writel arch/x86/include/asm/io.h:71 [inline]
RIP: 0010:slow_imageblit drivers/video/fbdev/core/cfbimgblt.c:178 [inline]
RIP: 0010:cfb_imageblit+0x99b/0x1040 drivers/video/fbdev/core/cfbimgblt.c:302
Code: e0 09 44 24 04 e8 35 a4 e7 fd 45 39 e7 0f 87 44 ff ff ff e8 37 a3 e7 fd 48 8b 44 24 08 8b 4c 24 04 48 8d 78 04 48 89 7c 24 08 <89> 08 44 89 e6 44 89 ff e8 08 a4 e7 fd 45 39 e7 0f 85 04 ff ff ff
RSP: 0018:ffff888000137160 EFLAGS: 00010293
RAX: 0000000000137408 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff83820e99 RDI: 000000000013740c
RBP: 0000000000000000 R08: ffff8880a5748f7f R09: 000000000000001c
R10: 0000000000000004 R11: 0000000000000000 R12: 000000000000001c
R13: 0000000000000000 R14: ffff8880a5748f72 R15: 000000000000001c
FS: 00007f48dc3f7700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000137408 CR3: 000000000005f000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


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