linux-kernel - [PATCH] add return value checking of get_user() in set_vesa

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Date:	Tue, 21 Nov 2006 14:15:28 +0900
From:	Yoichi Yuasa <yoichi_yuasa@...peaks.co.jp>
To:	Andrew Morton <akpm@...l.org>
Cc:	yoichi_yuasa@...peaks.co.jp,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] add return value checking of get_user() in
 set_vesa_blanking()

Hi,

This patch has added return value checking of get_user() in set_vesa_blanking().

Yoichi

Signed-off-by: Yoichi Yuasa <yoichi_yuasa@...peaks.co.jp>
 
diff -pruN -X generic/Documentation/dontdiff generic-orig/drivers/char/vt.c generic/drivers/char/vt.c
--- generic-orig/drivers/char/vt.c	2006-11-21 10:23:39.409667250 +0900
+++ generic/drivers/char/vt.c	2006-11-21 10:11:48.037209250 +0900
@@ -3318,9 +3318,10 @@ postcore_initcall(vtconsole_class_init);
 
 static void set_vesa_blanking(char __user *p)
 {
-    unsigned int mode;
-    get_user(mode, p + 1);
-    vesa_blank_mode = (mode < 4) ? mode : 0;
+	unsigned int mode;
+
+	if (!get_user(mode, p + 1))
+		vesa_blank_mode = (mode < 4) ? mode : 0;
 }
 
 void do_blank_screen(int entering_gfx)
-
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