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From: Yinghai Lu <yhlu.kernel@gmail.com>
To: Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
	"H. Peter Anvin" <hpa@zytor.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: [PATCH] x86: change size if e820_update/remove_range
Date: Tue, 24 Jun 2008 14:58:38 -0700	[thread overview]
Message-ID: <200806241458.38624.yhlu.kernel@gmail.com> (raw)
In-Reply-To: <200806241457.29607.yhlu.kernel@gmail.com>


in case someone using crazy parameter while calling them.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.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;

      reply	other threads:[~2008-06-24 21:59 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-06-24 21:55 [PATCH] x86: fix e820_update_range size when overlapping Yinghai Lu
2008-06-24 21:56 ` [PATCH] x86: get max_pfn_mapped in init_memory_mapping Yinghai Lu
2008-06-24 21:57   ` [PATCH] x86: add table_top check for alloc_low_page in 64 bit Yinghai Lu
2008-06-24 21:58     ` Yinghai Lu [this message]

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