[xen stable-4.16] xen/arm: Avoid overflow using MIDR_IMPLEMENTOR_MASK

[patchbot@xxxxxxx]

commit 048185188fbae9d0e7d25992d8318be2a4a5a2cc
Author:     Michal Orzel <michal.orzel@xxxxxxx>
AuthorDate: Thu May 5 13:59:06 2022 +0200
Commit:     Stefano Stabellini <stefano.stabellini@xxxxxxx>
CommitDate: Wed Aug 3 14:57:43 2022 -0700

    xen/arm: Avoid overflow using MIDR_IMPLEMENTOR_MASK
    
    Value of macro MIDR_IMPLEMENTOR_MASK exceeds the range of integer
    and can lead to overflow. Currently there is no issue as it is used
    in an expression implicitly casted to u32 in MIDR_IS_CPU_MODEL_RANGE.
    To avoid possible problems, fix the macro.
    
    Signed-off-by: Michal Orzel <michal.orzel@xxxxxxx>
    Link: https://lore.kernel.org/r/20220426070603.56031-1-michal.orzel@xxxxxxx
    Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx>
    Acked-by: Julien Grall <jgrall@xxxxxxxxxx>
    (cherry picked from commit aa1cba100bff84b211f27639bd6efeaf7e701bcc)
---
 xen/include/asm-arm/processor.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/include/asm-arm/processor.h b/xen/include/asm-arm/processor.h
index 852b5f3c24..7a1c4c4410 100644
--- a/xen/include/asm-arm/processor.h
+++ b/xen/include/asm-arm/processor.h
@@ -39,7 +39,7 @@
 #define MIDR_VARIANT(midr) \
     (((midr) & MIDR_VARIANT_MASK) >> MIDR_VARIANT_SHIFT)
 #define MIDR_IMPLEMENTOR_SHIFT  24
-#define MIDR_IMPLEMENTOR_MASK   (0xff << MIDR_IMPLEMENTOR_SHIFT)
+#define MIDR_IMPLEMENTOR_MASK   (0xffU << MIDR_IMPLEMENTOR_SHIFT)
 #define MIDR_IMPLEMENTOR(midr) \
     (((midr) & MIDR_IMPLEMENTOR_MASK) >> MIDR_IMPLEMENTOR_SHIFT)
 
--
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