This is a note to let you know that I've just added the patch titled

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

to my char-misc git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git in the char-misc-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From 01faae5193d6190b7b3aa93dae43f514e866d652 Mon Sep 17 00:00:00 2001

From: Du Cheng ducheng2@gmail.com Date: Fri, 12 Mar 2021 16:14:21 +0800 Subject: drivers: video: fbcon: fix NULL dereference in fbcon_cursor()

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 --- drivers/video/fbdev/core/fbcon.c | 3 +++ 1 file changed, 3 insertions(+)

diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c index 44a5cd2f54cc..3406067985b1 100644 --- a/drivers/video/fbdev/core/fbcon.c +++ b/drivers/video/fbdev/core/fbcon.c @@ -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)); }