linux-kernel - [PATCH] x86/xen: panic on bad Xen-provided memory map

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Date:	Thu, 16 Oct 2014 20:48:11 -0700
From:	Martin Kelly <martin@...tingkelly.com>
To:	david.vrabel@...rix.com, xen-devel@...ts.xenproject.org,
	x86@...nel.org, linux-kernel@...r.kernel.org
Cc:	konrad.wilk@...cle.com, boris.ostrovsky@...cle.com,
	tglx@...utronix.de, mingo@...hat.com,
	Martin Kelly <martin@...tingkelly.com>,
	Martin Kelly <martkell@...zon.com>
Subject: [PATCH] x86/xen: panic on bad Xen-provided memory map

Panic if Xen provides a memory map with 0 entries. Although this is
unlikely, it is better to catch the error at the point of seeing the map
than later on as a symptom of some other crash.

Signed-off-by: Martin Kelly <martkell@...zon.com>
---
 arch/x86/xen/setup.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index af72161..29834b3 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -595,6 +595,7 @@ char * __init xen_memory_setup(void)
 		rc = 0;
 	}
 	BUG_ON(rc);
+	BUG_ON(memmap.nr_entries == 0);
 
 	/*
 	 * Xen won't allow a 1:1 mapping to be created to UNUSABLE
-- 
2.1.1

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