diff options
| author | Du Cheng <ducheng2@gmail.com> | 2021-03-12 16:14:21 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-04-07 12:48:51 +0200 |
| commit | 5369cc42ab21a93cbc9a8f3f8c7a004bbe023178 (patch) | |
| tree | 167655d2805c0634b5e8b376f9d00df469a82cbc | |
| parent | 7eb9eb82fc0287810ea23f5f84c40e7e4701b11f (diff) | |
drivers: video: fbcon: fix NULL dereference in fbcon_cursor()
commit 01faae5193d6190b7b3aa93dae43f514e866d652 upstream.
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>
| -rw-r--r-- | drivers/video/fbdev/core/fbcon.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c index 5742a0dc774e..cf0e025416e5 100644 --- a/drivers/video/fbdev/core/fbcon.c +++ b/drivers/video/fbdev/core/fbcon.c @@ -1306,6 +1306,9 @@ 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)); } |