linux-kernel - [PATCH v3 1/2] mtd: Replace kcalloc() with devm

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Message-Id: <20250205023141.26195-1-jiashengjiangcool@gmail.com>
Date: Wed,  5 Feb 2025 02:31:40 +0000
From: Jiasheng Jiang <jiashengjiangcool@...il.com>
To: christophe.jaillet@...adoo.fr
Cc: gmpy.liaowx@...il.com,
	jiashengjiangcool@...il.com,
	jirislaby@...nel.org,
	kees@...nel.org,
	linux-kernel@...r.kernel.org,
	linux-mtd@...ts.infradead.org,
	miquel.raynal@...tlin.com,
	richard@....at,
	stable@...r.kernel.org,
	vigneshr@...com
Subject: [PATCH v3 1/2] mtd: Replace kcalloc() with devm_kcalloc()

Replace kcalloc() with devm_kcalloc() to prevent memory leaks in case of
errors.

Fixes: 78c08247b9d3 ("mtd: Support kmsg dumper based on pstore/blk")
Cc: <stable@...r.kernel.org> # v5.10+
Signed-off-by: Jiasheng Jiang <jiashengjiangcool@...il.com>
---
Changelog:

v2 -> v3:

1. Replace kcalloc() with devm_kcalloc().
2. Remove kfree().
3. Remove checks.

v1 -> v2:

1. Remove redundant logging.
2. Add kfree() in the error-handling path.
---
 drivers/mtd/mtdpstore.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/mtd/mtdpstore.c b/drivers/mtd/mtdpstore.c
index 7ac8ac901306..2d004d41cf75 100644
--- a/drivers/mtd/mtdpstore.c
+++ b/drivers/mtd/mtdpstore.c
@@ -417,11 +417,11 @@ static void mtdpstore_notify_add(struct mtd_info *mtd)
 	}
 
 	longcnt = BITS_TO_LONGS(div_u64(mtd->size, info->kmsg_size));
-	cxt->rmmap = kcalloc(longcnt, sizeof(long), GFP_KERNEL);
-	cxt->usedmap = kcalloc(longcnt, sizeof(long), GFP_KERNEL);
+	cxt->rmmap = devm_kcalloc(&mtd->dev, longcnt, sizeof(long), GFP_KERNEL);
+	cxt->usedmap = devm_kcalloc(&mtd->dev, longcnt, sizeof(long), GFP_KERNEL);
 
 	longcnt = BITS_TO_LONGS(div_u64(mtd->size, mtd->erasesize));
-	cxt->badmap = kcalloc(longcnt, sizeof(long), GFP_KERNEL);
+	cxt->badmap = devm_kcalloc(&mtd->dev, longcnt, sizeof(long), GFP_KERNEL);
 
 	/* just support dmesg right now */
 	cxt->dev.flags = PSTORE_FLAGS_DMESG;
@@ -527,9 +527,6 @@ static void mtdpstore_notify_remove(struct mtd_info *mtd)
 	mtdpstore_flush_removed(cxt);
 
 	unregister_pstore_device(&cxt->dev);
-	kfree(cxt->badmap);
-	kfree(cxt->usedmap);
-	kfree(cxt->rmmap);
 	cxt->mtd = NULL;
 	cxt->index = -1;
 }
-- 
2.25.1