linux-kernel - [PATCH 1/1] cxl/hdm: Fix potential infinite loop in __cxl_dpa

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Message-Id: <20260112120526.530232-1-ming.li@zohomail.com>
Date: Mon, 12 Jan 2026 20:05:26 +0800
From: Li Ming <ming.li@...omail.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,
	Li Ming <ming.li@...omail.com>
Subject: [PATCH 1/1] cxl/hdm: Fix potential infinite loop in __cxl_dpa_reserve()

In __cxl_dpa_reserve(), it will check if the new resource range is
included in one of paritions of the cxl memory device.
cxlds->nr_paritions is used to represent how many partitions information
the cxl memory device has. In the loop, if driver cannot find a
partition including the new resource range, it will be an infinite loop.

Fixes: be5cbd084027 ("cxl: Kill enum cxl_decoder_mode")
Signed-off-by: Li Ming <ming.li@...omail.com>
---
 drivers/cxl/core/hdm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/cxl/core/hdm.c b/drivers/cxl/core/hdm.c
index 1c5d2022c87a..a470099a69f1 100644
--- a/drivers/cxl/core/hdm.c
+++ b/drivers/cxl/core/hdm.c
@@ -403,7 +403,7 @@ static int __cxl_dpa_reserve(struct cxl_endpoint_decoder *cxled,
 	 * is not set.
 	 */
 	if (cxled->part < 0)
-		for (int i = 0; cxlds->nr_partitions; i++)
+		for (int i = 0; i < cxlds->nr_partitions; i++)
 			if (resource_contains(&cxlds->part[i].res, res)) {
 				cxled->part = i;
 				break;
-- 
2.34.1