Commit 01faae51 authored by Du Cheng's avatar Du Cheng Committed by Greg Kroah-Hartman
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drivers: video: fbcon: fix NULL dereference in fbcon_cursor() 



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

Reported-by: default avatar <syzbot+b67aaae8d3a927f68d20@syzkaller.appspotmail.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: default avatarDu Cheng <ducheng2@gmail.com>
Link: https://lore.kernel.org/r/20210312081421.452405-1-ducheng2@gmail.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent ce068bc7

drivers/video/fbdev/core/fbcon.c

+3 −0
Original line number Diff line number Diff line
@@ -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));

}