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Message-Id: <20210405085039.029929021@linuxfoundation.org>
Date: Mon, 5 Apr 2021 10:54:57 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org,
syzbot+b67aaae8d3a927f68d20@...kaller.appspotmail.com,
Du Cheng <ducheng2@...il.com>
Subject: [PATCH 5.11 148/152] drivers: video: fbcon: fix NULL dereference in fbcon_cursor()
From: Du Cheng <ducheng2@...il.com>
commit 01faae5193d6190b7b3aa93dae43f514e866d652 upstream.
add null-check on function pointer before dereference on ops->cursor
Reported-by: syzbot+b67aaae8d3a927f68d20@...kaller.appspotmail.com
Cc: stable <stable@...r.kernel.org>
Signed-off-by: Du Cheng <ducheng2@...il.com>
Link: https://lore.kernel.org/r/20210312081421.452405-1-ducheng2@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/video/fbdev/core/fbcon.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/video/fbdev/core/fbcon.c
+++ b/drivers/video/fbdev/core/fbcon.c
@@ -1341,6 +1341,9 @@ 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));
}
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