[PATCH 1/1] EDAC, sb_edac: Fix out of bound write during DIMM configuration on KNL
From: Anna Karbownik
Date: Thu Feb 22 2018 - 10:18:42 EST
From: akarbown <anna.karbownik@xxxxxxxxx>
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@xxxxxxxxxx>
Signed-off-by: Anna Karbownik <anna.karbownik@xxxxxxxxx>
---
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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