linux-kernel - [PATCH v2 1/1] EDAC/skx: Fix overflows on the DRAM row address mapping arrays

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Date:   Sat, 11 Feb 2023 09:17:28 +0800
From:   Qiuxu Zhuo <qiuxu.zhuo@...el.com>
To:     Tony Luck <tony.luck@...el.com>
Cc:     Qiuxu Zhuo <qiuxu.zhuo@...el.com>, Borislav Petkov <bp@...en8.de>,
        Aristeu Rozanski <aris@...hat.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Feng Xu <feng.f.xu@...el.com>, linux-edac@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/1] EDAC/skx: Fix overflows on the DRAM row address mapping arrays

The current DRAM row address mapping arrays skx_{open,close}_row[]
only support ranks with sizes up to 16G. Decoding a rank address
to a DRAM row address for a 32G rank by using either one of the
above arrays by the skx_edac driver, will result in an overflow on
the array.

For a 32G rank, the most significant DRAM row address bit (the
bit17) is mapped from the bit34 of the rank address. Add this new
mapping item to both arrays to fix the overflow issue.

Fixes: 4ec656bdf43a ("EDAC, skx_edac: Add EDAC driver for Skylake")
Reported-by: Feng Xu <feng.f.xu@...el.com>
Tested-by: Feng Xu <feng.f.xu@...el.com>
Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@...el.com>
---
v1->v2:
    Fix the Fixes tag in the commit message.

 drivers/edac/skx_base.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/edac/skx_base.c b/drivers/edac/skx_base.c
index 9397abb42c49..0a862336a7ce 100644
--- a/drivers/edac/skx_base.c
+++ b/drivers/edac/skx_base.c
@@ -510,7 +510,7 @@ static bool skx_rir_decode(struct decoded_addr *res)
 }
 
 static u8 skx_close_row[] = {
-	15, 16, 17, 18, 20, 21, 22, 28, 10, 11, 12, 13, 29, 30, 31, 32, 33
+	15, 16, 17, 18, 20, 21, 22, 28, 10, 11, 12, 13, 29, 30, 31, 32, 33, 34
 };
 
 static u8 skx_close_column[] = {
@@ -518,7 +518,7 @@ static u8 skx_close_column[] = {
 };
 
 static u8 skx_open_row[] = {
-	14, 15, 16, 20, 28, 21, 22, 23, 24, 25, 26, 27, 29, 30, 31, 32, 33
+	14, 15, 16, 20, 28, 21, 22, 23, 24, 25, 26, 27, 29, 30, 31, 32, 33, 34
 };
 
 static u8 skx_open_column[] = {
-- 
2.17.1