[Xen-devel] [PATCH] fix potential pa_range_info out of bound access

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

pa_range_info has only 8 elements and is accessed using pa_range as
index. pa_range is initialized to 16, potentially causing out of bound
access errors. Fix the issue by initializing pa_range to the effective
number of pa_range_info elements.

CID 1381865

Signed-off-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>

diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
index e4991df..245fcd1 100644
--- a/xen/arch/arm/p2m.c
+++ b/xen/arch/arm/p2m.c
@@ -1629,7 +1629,7 @@ void __init setup_virt_paging(void)
     };
 
     unsigned int cpu;
-    unsigned int pa_range = 0x10; /* Larger than any possible value */
+    unsigned int pa_range = sizeof(pa_range_info) / sizeof(pa_range_info[0]);
 
     for_each_online_cpu ( cpu )
     {

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