linux-kernel - [PATCH 5.10 063/717] x86/mce: Correct the detection of invalid notifier priorities

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Date:   Mon, 28 Dec 2020 13:41:01 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Zhen Lei <thunder.leizhen@...wei.com>,
        Borislav Petkov <bp@...e.de>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 063/717] x86/mce: Correct the detection of invalid notifier priorities

From: Zhen Lei <thunder.leizhen@...wei.com>

[ Upstream commit 15af36596ae305aefc8c502c2d3e8c58221709eb ]

Commit

  c9c6d216ed28 ("x86/mce: Rename "first" function as "early"")

changed the enumeration of MCE notifier priorities. Correct the check
for notifier priorities to cover the new range.

 [ bp: Rewrite commit message, remove superfluous brackets in
   conditional. ]

Fixes: c9c6d216ed28 ("x86/mce: Rename "first" function as "early"")
Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Link: https://lkml.kernel.org/r/20201106141216.2062-2-thunder.leizhen@huawei.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/x86/include/asm/mce.h     | 3 ++-
 arch/x86/kernel/cpu/mce/core.c | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
index a0f147893a041..fc25c88c7ff29 100644
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -177,7 +177,8 @@ enum mce_notifier_prios {
 	MCE_PRIO_EXTLOG,
 	MCE_PRIO_UC,
 	MCE_PRIO_EARLY,
-	MCE_PRIO_CEC
+	MCE_PRIO_CEC,
+	MCE_PRIO_HIGHEST = MCE_PRIO_CEC
 };
 
 struct notifier_block;
diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c
index 32b7099e35111..311688202ea51 100644
--- a/arch/x86/kernel/cpu/mce/core.c
+++ b/arch/x86/kernel/cpu/mce/core.c
@@ -162,7 +162,8 @@ EXPORT_SYMBOL_GPL(mce_log);
 
 void mce_register_decode_chain(struct notifier_block *nb)
 {
-	if (WARN_ON(nb->priority > MCE_PRIO_MCELOG && nb->priority < MCE_PRIO_EDAC))
+	if (WARN_ON(nb->priority < MCE_PRIO_LOWEST ||
+		    nb->priority > MCE_PRIO_HIGHEST))
 		return;
 
 	blocking_notifier_chain_register(&x86_mce_decoder_chain, nb);
-- 
2.27.0