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From: Li Ming <ming.li@zohomail.com>
To: dave@stgolabs.net, jonathan.cameron@huawei.com,
	dave.jiang@intel.com, alison.schofield@intel.com,
	vishal.l.verma@intel.com, ira.weiny@intel.com,
	dan.j.williams@intel.com
Cc: linux-cxl@vger.kernel.org, linux-kernel@vger.kernel.org,
	Li Ming <ming.li@zohomail.com>
Subject: [PATCH 1/1] cxl/hdm: Fix potential infinite loop in __cxl_dpa_reserve()
Date: Mon, 12 Jan 2026 20:05:26 +0800	[thread overview]
Message-ID: <20260112120526.530232-1-ming.li@zohomail.com> (raw)

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@zohomail.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


             reply	other threads:[~2026-01-12 12:05 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-01-12 12:05 Li Ming [this message]
2026-01-12 15:35 ` Dave Jiang
2026-01-12 15:55 ` Ira Weiny
2026-01-12 16:03 ` Dave Jiang
2026-01-12 18:02   ` [PATCH] " Markus Elfring

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