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

[Martin Kelly]

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@xxxxxxxxxx>
---
 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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/