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drivers: video: fbcon: fix NULL dereference in fbcon_cursor()

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add null-check on function pointer before dereference on ops->cursor

Reported-by: syzbot+b67aaae8d3a927f68d20@syzkaller.appspotmail.com
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Du Cheng <ducheng2@gmail.com>
Link: https://lore.kernel.org/r/20210312081421.452405-1-ducheng2@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Du Cheng 2021-03-12 16:14:21 +08:00 committed by Greg Kroah-Hartman
parent ce068bc7da
commit 01faae5193
1 changed files with 3 additions and 0 deletions
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3
drivers/video/fbdev/core/fbcon.c
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@ -1333,6 +1333,9 @@ static void fbcon_cursor(struct vc_data *vc, int mode)
ops->cursor_flash = (mode == CM_ERASE) ? 0 : 1;
if (!ops->cursor)
return;
ops->cursor(vc, info, mode, get_color(vc, info, c, 1),
get_color(vc, info, c, 0));
}