linux-kernel - [PATCH] x86: fix early_reserve

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Date:	Wed, 06 May 2009 13:02:19 +0100
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	<mingo@...e.hu>, <tglx@...utronix.de>, <hpa@...or.com>
Cc:	<linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: fix early_reserve_e820()

Impact: bug fix

If the first non-reserved (sub-)range doesn't fit the size requested,
an endless loop will be entered. If a range returned from
find_e820_area_size() turns out insufficient in size, the range must
be skipped before calling the function again.

Signed-off-by: Jan Beulich <jbeulich@...ell.com>

---
 arch/x86/kernel/e820.c |   11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

--- linux-2.6.30-rc4/arch/x86/kernel/e820.c	2009-04-30 09:42:42.000000000 +0200
+++ 2.6.30-rc4-x86-early-reserve-e820/arch/x86/kernel/e820.c	2009-05-06 11:25:44.000000000 +0200
@@ -1074,12 +1074,13 @@ u64 __init early_reserve_e820(u64 startt
 	u64 addr;
 	u64 start;
 
-	start = startt;
-	while (size < sizet && (start + 1))
+	for (start = startt; ; start += size) {
 		start = find_e820_area_size(start, &size, align);
-
-	if (size < sizet)
-		return 0;
+		if (!(start + 1))
+			return 0;
+		if (size >= sizet)
+			break;
+	}
 
 #ifdef CONFIG_X86_32
 	if (start >= MAXMEM)



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