linux-kernel - [PATCH 2/2] cxl/core: Fix incorrect array index in cxl_clear_event

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Date: Mon,  1 Apr 2024 18:10:56 +0900
From: Kwangjin Ko <kwangjin.ko@...com>
To: dave@...olabs.net,
	jonathan.cameron@...wei.com,
	dave.jiang@...el.com,
	alison.schofield@...el.com,
	vishal.l.verma@...el.com,
	ira.weiny@...el.com,
	dan.j.williams@...el.com
Cc: linux-cxl@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	kernel_team@...ynix.com
Subject: [PATCH 2/2] cxl/core: Fix incorrect array index in cxl_clear_event_record()

The variable 'i' should be incremented after dev_dbg(), or print
gen->hdr.handle instead. Otherwise, the handle value of the next loop
will be printed. Furthermore, in the final loop, accessing 'handles[i]'
will cause a buffer overflow.

Signed-off-by: Kwangjin Ko <kwangjin.ko@...com>
---
 drivers/cxl/core/mbox.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c
index a38531a055c8..84014aa01c95 100644
--- a/drivers/cxl/core/mbox.c
+++ b/drivers/cxl/core/mbox.c
@@ -913,9 +913,9 @@ static int cxl_clear_event_record(struct cxl_memdev_state *mds,
 		struct cxl_event_record_raw *raw = &get_pl->records[cnt];
 		struct cxl_event_generic *gen = &raw->event.generic;
 
-		payload->handles[i++] = gen->hdr.handle;
 		dev_dbg(mds->cxlds.dev, "Event log '%d': Clearing %u\n", log,
-			le16_to_cpu(payload->handles[i]));
+			le16_to_cpu(gen->hdr.handle));
+		payload->handles[i++] = gen->hdr.handle;
 
 		if (i == max_handles) {
 			payload->nr_recs = i;
-- 
2.34.1