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 14:47:44 +0200 |
| commit | cde4e338c2b2dda998dd480ecf9df55a1624820d (patch) | |
| tree | 67035df852f666de6f0597f5c432cd2b2fc6d887 | |
| parent | 0ca13611d33fe3bd442973e5250b0d665d832d9e (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 4cf71ee0965a..0a9202176ffc 100644 --- a/drivers/video/fbdev/core/fbcon.c +++ b/drivers/video/fbdev/core/fbcon.c @@ -1339,6 +1339,9 @@ 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)); } |