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From: Robert Richter <rrichter@marvell.com>
To: Borislav Petkov <bp@alien8.de>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	Tony Luck <tony.luck@intel.com>
Cc: James Morse <james.morse@arm.com>,
	Aristeu Rozanski <aris@redhat.com>,
	Robert Richter <rrichter@marvell.com>,
	"linux-edac@vger.kernel.org" <linux-edac@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: [PATCH v3 06/10] EDAC/mc: Report "unknown memory" on too many DIMM labels found
Date: Thu, 23 Jan 2020 09:03:00 +0000
Message-ID: <20200123090210.26933-7-rrichter@marvell.com> (raw)
In-Reply-To: <20200123090210.26933-1-rrichter@marvell.com>

There is a limitation to report only EDAC_MAX_LABELS in e->label of
the error descriptor. This is to prevent a possible string overflow.
Current implementation falls back to "any memory" in this case and
also stops all further processing to find a unique row and channel of
the possible error location. Reporting "any memory" is wrong as the
memory controller reported an error location for one of the layers.
Instead, report "unknown memory" and also do not break early in the
loop to further check row and channel for uniqueness.

Signed-off-by: Robert Richter <rrichter@marvell.com>
Acked-by: Aristeu Rozanski <aris@redhat.com>
---
 drivers/edac/edac_mc.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
index e75cb7a9c454..aa94152777fe 100644
--- a/drivers/edac/edac_mc.c
+++ b/drivers/edac/edac_mc.c
@@ -1245,20 +1245,21 @@ void edac_mc_handle_error(const enum hw_event_mc_err_type type,
 		 * channel/memory controller/...  may be affected.
 		 * Also, don't show errors for empty DIMM slots.
 		 */
-		if (!e->enable_per_layer_report || !dimm->nr_pages)
+		if (!dimm->nr_pages)
 			continue;
 
-		if (n_labels >= EDAC_MAX_LABELS) {
-			e->enable_per_layer_report = false;
-			break;
-		}
 		n_labels++;
-		if (p != e->label) {
-			strcpy(p, OTHER_LABEL);
-			p += strlen(OTHER_LABEL);
+		if (n_labels > EDAC_MAX_LABELS) {
+			p = e->label;
+			*p = '\0';
+		} else {
+			if (p != e->label) {
+				strcpy(p, OTHER_LABEL);
+				p += strlen(OTHER_LABEL);
+			}
+			strcpy(p, dimm->label);
+			p += strlen(p);
 		}
-		strcpy(p, dimm->label);
-		p += strlen(p);
 
 		/*
 		 * get csrow/channel of the DIMM, in order to allow
-- 
2.20.1


  parent reply index

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-23  9:02 [PATCH v3 00/10] EDAC: Rework core and ghes drivers, part two Robert Richter
2020-01-23  9:02 ` [PATCH v3 01/10] EDAC/mc: Split edac_mc_alloc() into smaller functions Robert Richter
2020-01-23  9:02 ` [PATCH v3 02/10] EDAC/mc: Reorder functions edac_mc_alloc*() Robert Richter
2020-01-23 19:02   ` Matthias Brugger
2020-01-30 18:49     ` Robert Richter
2020-01-23  9:02 ` [PATCH v3 03/10] EDAC: Store error type in struct edac_raw_error_desc Robert Richter
2020-01-23  9:02 ` [PATCH v3 04/10] EDAC/mc: Determine mci pointer from the error descriptor Robert Richter
2020-01-23  9:02 ` [PATCH v3 05/10] EDAC/mc: Create new function edac_inc_csrow() Robert Richter
2020-02-13 12:47   ` Borislav Petkov
2020-02-14 12:40     ` Robert Richter
2020-02-14 14:17   ` [PATCH v2] " Robert Richter
2020-01-23  9:03 ` Robert Richter [this message]
2020-01-23  9:03 ` [PATCH v3 07/10] EDAC/mc: Remove enable_per_layer_report function arguments Robert Richter
2020-01-23  9:03 ` [PATCH v3 08/10] EDAC/mc: Pass the error descriptor to error reporting functions Robert Richter
2020-01-23  9:03 ` [PATCH v3 09/10] EDAC/mc: Remove detail[] string and cleanup error string generation Robert Richter
2020-01-23  9:03 ` [PATCH v3 10/10] EDAC/mc: Remove per layer counters Robert Richter
2020-02-17 15:49 ` [PATCH v3 00/10] EDAC: Rework core and ghes drivers, part two Borislav Petkov

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