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[4.14,52/52] drivers: video: fbcon: fix NULL dereference in fbcon_cursor()

Message ID 20210405085023.681659437@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg KH April 5, 2021, 8:54 a.m. UTC 
From: Du Cheng <ducheng2@gmail.com>

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

--- a/drivers/video/fbdev/core/fbcon.c
+++ b/drivers/video/fbdev/core/fbcon.c
@@ -1284,6 +1284,9 @@  static void fbcon_cursor(struct vc_data
 
 	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));
 }