linux-kernel - [PATCH 1/1] EDAC, sb_edac: Fix out of bound write during DIMM configuration on KNL

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Date:   Thu, 22 Feb 2018 16:18:13 +0100
From:   Anna Karbownik <anna.karbownik@...el.com>
To:     mchehab@...nel.org, bp@...en8.de, linux-edac@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     dan.carpenter@...cle.com, tony.luck@...el.com,
        jim.m.snow@...el.com, qiuxu.zhuo@...el.com,
        lukasz.odzioba@...el.com, krzysztof.paliswiat@...el.com,
        anna.karbownik@...el.com
Subject: [PATCH 1/1] EDAC, sb_edac: Fix out of bound write during DIMM configuration on KNL

From: akarbown <anna.karbownik@...el.com>

In one of the previous patches we decreased NUM_CHANNELS from 8 to 4, but
it is not enough for Knights Landing which supports up to 6 channels.

This caused unattended writes to pvt->mirror_mode and pvt->tolm variables
which don't pay critical role on KNL code path, so driver was somehow functional.

The easiest way of fixing it is to change NUM_CHANNELS to 6.
An alternative solution would be to restructure KNL part of the driver to
2MC/3channel representation.

Fixes: 3286d3eb906c ("EDAC, sb_edac: Drop NUM_CHANNELS from 8 back to 4")
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Anna Karbownik <anna.karbownik@...el.com>
---
 drivers/edac/sb_edac.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/edac/sb_edac.c b/drivers/edac/sb_edac.c
index f34430f..8721002 100644
--- a/drivers/edac/sb_edac.c
+++ b/drivers/edac/sb_edac.c
@@ -279,7 +279,7 @@ static inline int sad_pkg(const struct interleave_pkg *table, u32 reg,
  * sbridge structs
  */

-#define NUM_CHANNELS		4	/* Max channels per MC */
+#define NUM_CHANNELS		6	/* Max channels per MC */
 #define MAX_DIMMS		3	/* Max DIMMS per channel */
 #define KNL_MAX_CHAS		38	/* KNL max num. of Cache Home Agents */
 #define KNL_MAX_CHANNELS	6	/* KNL max num. of PCI channels */
-- 
1.8.3.1

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