[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen stable-4.16] xen/arm: Avoid overflow using MIDR_IMPLEMENTOR_MASK
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) -- generated by git-patchbot for /home/xen/git/xen.git#stable-4.16
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