[Xen-devel] [PATCH v2] xen/arm: add lower-bound check in mfn_valid

[Jaeyong Yoo <jaeyong.yoo@xxxxxxxxxxx>]

mfn_valid only checks the upper-bound of mfn (max_page).
Add the lower-bound check of mfn (frametable_base_mfn).

Signed-off-by: Jaeyong Yoo <jaeyong.yoo@xxxxxxxxxxx>
---
 xen/include/asm-arm/mm.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/include/asm-arm/mm.h b/xen/include/asm-arm/mm.h
index 27284d0..97c2ee0 100644
--- a/xen/include/asm-arm/mm.h
+++ b/xen/include/asm-arm/mm.h
@@ -190,7 +190,7 @@ static inline void __iomem *ioremap_wc(paddr_t start, 
size_t len)
 
 #define mfn_valid(mfn)        ({                                              \
     unsigned long __m_f_n = (mfn);                                            \
-    likely(__m_f_n < max_page);                                               \
+    likely(__m_f_n >= frametable_base_mfn && __m_f_n < max_page);             \
 })
 
 #define max_pdx                 max_page
-- 
1.8.1.2


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