linux-kernel - RE: [PATCH 1/1] cxl/edac: Fix potential memory leak issues

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Message-ID: <d44aac6a202d4e1695a52ddc0e33a735@huawei.com>
Date: Wed, 11 Jun 2025 10:44:01 +0000
From: Shiju Jose <shiju.jose@...wei.com>
To: Li Ming <ming.li@...omail.com>, "dave@...olabs.net" <dave@...olabs.net>,
	Jonathan Cameron <jonathan.cameron@...wei.com>, "dave.jiang@...el.com"
	<dave.jiang@...el.com>, "alison.schofield@...el.com"
	<alison.schofield@...el.com>, "vishal.l.verma@...el.com"
	<vishal.l.verma@...el.com>, "ira.weiny@...el.com" <ira.weiny@...el.com>,
	"dan.j.williams@...el.com" <dan.j.williams@...el.com>
CC: "linux-cxl@...r.kernel.org" <linux-cxl@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/1] cxl/edac: Fix potential memory leak issues

>-----Original Message-----
>From: Li Ming <ming.li@...omail.com>
>Sent: 11 June 2025 04:36
>To: dave@...olabs.net; Jonathan Cameron <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; Shiju Jose
><shiju.jose@...wei.com>
>Cc: linux-cxl@...r.kernel.org; linux-kernel@...r.kernel.org; Li Ming
><ming.li@...omail.com>
>Subject: [PATCH 1/1] cxl/edac: Fix potential memory leak issues
>
>In cxl_store_rec_gen_media() and cxl_store_rec_dram(), use kmemdup() to
>duplicate a cxl gen_media/dram event to store the event in a xarray by
>xa_store(). The cxl gen_media/dram event allocated by kmemdup() should be
>freed in the case that the xa_store() fails.
>
>Fixes: 0b5ccb0de1e2 ("cxl/edac: Support for finding memory operation
>attributes from the current boot")
>Signed-off-by: Li Ming <ming.li@...omail.com>

Thanks Ming for fixing. 

Tested-by: Shiju Jose <shiju.jose@...wei.com> 
Reviewed-by: Shiju Jose <shiju.jose@...wei.com>

>---
>base-commit: 87b42c114cdda76c8ad3002f2096699ad5146cb3 cxl/fixes
>---
> drivers/cxl/core/edac.c | 10 ++++++----
> 1 file changed, 6 insertions(+), 4 deletions(-)
>
>diff --git a/drivers/cxl/core/edac.c b/drivers/cxl/core/edac.c index
>2cbc664e5d62..b4c5c23a45d4 100644
>--- a/drivers/cxl/core/edac.c
>+++ b/drivers/cxl/core/edac.c
>@@ -1086,13 +1086,13 @@ static void cxl_del_overflow_old_recs(struct xarray
>*rec_xarray)  int cxl_store_rec_gen_media(struct cxl_memdev *cxlmd, union
>cxl_event *evt)  {
> 	struct cxl_mem_err_rec *array_rec = cxlmd->err_rec_array;
>-	struct cxl_event_gen_media *rec;
> 	void *old_rec;
>
> 	if (!IS_ENABLED(CONFIG_CXL_EDAC_MEM_REPAIR) || !array_rec)
> 		return 0;
>
>-	rec = kmemdup(&evt->gen_media, sizeof(*rec), GFP_KERNEL);
>+	struct cxl_event_gen_media *rec __free(kfree) =
>+		kmemdup(&evt->gen_media, sizeof(*rec), GFP_KERNEL);
> 	if (!rec)
> 		return -ENOMEM;
>
>@@ -1106,6 +1106,7 @@ int cxl_store_rec_gen_media(struct cxl_memdev
>*cxlmd, union cxl_event *evt)
>
> 	cxl_del_expired_gmedia_recs(&array_rec->rec_gen_media, rec);
> 	cxl_del_overflow_old_recs(&array_rec->rec_gen_media);
>+	retain_and_null_ptr(rec);
>
> 	return 0;
> }
>@@ -1114,13 +1115,13 @@
>EXPORT_SYMBOL_NS_GPL(cxl_store_rec_gen_media, "CXL");  int
>cxl_store_rec_dram(struct cxl_memdev *cxlmd, union cxl_event *evt)  {
> 	struct cxl_mem_err_rec *array_rec = cxlmd->err_rec_array;
>-	struct cxl_event_dram *rec;
> 	void *old_rec;
>
> 	if (!IS_ENABLED(CONFIG_CXL_EDAC_MEM_REPAIR) || !array_rec)
> 		return 0;
>
>-	rec = kmemdup(&evt->dram, sizeof(*rec), GFP_KERNEL);
>+	struct cxl_event_dram *rec __free(kfree) =
>+		kmemdup(&evt->dram, sizeof(*rec), GFP_KERNEL);
> 	if (!rec)
> 		return -ENOMEM;
>
>@@ -1134,6 +1135,7 @@ int cxl_store_rec_dram(struct cxl_memdev *cxlmd,
>union cxl_event *evt)
>
> 	cxl_del_expired_dram_recs(&array_rec->rec_dram, rec);
> 	cxl_del_overflow_old_recs(&array_rec->rec_dram);
>+	retain_and_null_ptr(rec);
>
> 	return 0;
> }
>--
>2.34.1