linux-kernel - [PATCH] x86: change size if e820_update/remove

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Date:	Tue, 24 Jun 2008 14:58:38 -0700
From:	Yinghai Lu <yhlu.kernel@...il.com>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: change size if e820_update/remove_range


in case someone using crazy parameter while calling them.

Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>

diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index 512f779..6445220 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -405,6 +405,9 @@ u64 __init e820_update_range(u64 start, u64 size, unsigned old_type,
 
 	BUG_ON(old_type == new_type);
 
+	if (size > (ULLONG_MAX - start))
+		size = ULLONG_MAX - start;
+
 	for (i = 0; i < e820.nr_map; i++) {
 		struct e820entry *ei = &e820.map[i];
 		u64 final_start, final_end;
@@ -436,6 +439,9 @@ u64 __init e820_remove_range(u64 start, u64 size, unsigned old_type,
 	int i;
 	u64 real_removed_size = 0;
 
+	if (size > (ULLONG_MAX - start))
+		size = ULLONG_MAX - start;
+
 	for (i = 0; i < e820.nr_map; i++) {
 		struct e820entry *ei = &e820.map[i];
 		u64 final_start, final_end;
--
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