linux-kernel - [PATCH 5.4 423/434] x86/mce: Fix possibly incorrect severity calculation on AMD

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Message-Id: <20191229172731.249449127@linuxfoundation.org>
Date:   Sun, 29 Dec 2019 18:27:56 +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,
        "=?UTF-8?q?Jan=20H . =20Sch=C3=B6nherr?=" <jschoenh@...zon.de>,
        Borislav Petkov <bp@...e.de>, Tony Luck <tony.luck@...el.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
        linux-edac <linux-edac@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>, x86-ml <x86@...nel.org>,
        Yazen Ghannam <Yazen.Ghannam@....com>
Subject: [PATCH 5.4 423/434] x86/mce: Fix possibly incorrect severity calculation on AMD

From: Jan H. Schönherr <jschoenh@...zon.de>

commit a3a57ddad061acc90bef39635caf2b2330ce8f21 upstream.

The function mce_severity_amd_smca() requires m->bank to be initialized
for correct operation. Fix the one case, where mce_severity() is called
without doing so.

Fixes: 6bda529ec42e ("x86/mce: Grade uncorrected errors for SMCA-enabled systems")
Fixes: d28af26faa0b ("x86/MCE: Initialize mce.bank in the case of a fatal error in mce_no_way_out()")
Signed-off-by: Jan H. Schönherr <jschoenh@...zon.de>
Signed-off-by: Borislav Petkov <bp@...e.de>
Reviewed-by: Tony Luck <tony.luck@...el.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: linux-edac <linux-edac@...r.kernel.org>
Cc: <stable@...r.kernel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: x86-ml <x86@...nel.org>
Cc: Yazen Ghannam <Yazen.Ghannam@....com>
Link: https://lkml.kernel.org/r/20191210000733.17979-4-jschoenh@amazon.de
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/x86/kernel/cpu/mce/core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/kernel/cpu/mce/core.c
+++ b/arch/x86/kernel/cpu/mce/core.c
@@ -814,8 +814,8 @@ static int mce_no_way_out(struct mce *m,
 		if (quirk_no_way_out)
 			quirk_no_way_out(i, m, regs);

+		m->bank = i;
 		if (mce_severity(m, mca_cfg.tolerant, &tmp, true) >= MCE_PANIC_SEVERITY) {
-			m->bank = i;
 			mce_read_aux(m, i);
 			*msg = tmp;
 			return 1;