From: Jiasheng Jiang <jiashengjiangcool@gmail.com>
Date: Wed, 5 Feb 2025 02:31:41 +0000 (+0000)
Subject: mtd: Add check for devm_kcalloc()
X-Git-Tag: v6.6.88~241
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=7a083ad29fd452fbbffb6d765a7aa5ddc0c79c06;p=thirdparty%2Fkernel%2Fstable.git

mtd: Add check for devm_kcalloc()

commit 2aee30bb10d7bad0a60255059c9ce1b84cf0130e upstream.

Add a check for devm_kcalloc() to ensure successful allocation.

Fixes: 78c08247b9d3 ("mtd: Support kmsg dumper based on pstore/blk")
Cc: stable@vger.kernel.org # v5.10+
Signed-off-by: Jiasheng Jiang <jiashengjiangcool@gmail.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/mtd/mtdpstore.c b/drivers/mtd/mtdpstore.c
index 7ac8ac9013068..b3e2ea4dd40ed 100644
--- a/drivers/mtd/mtdpstore.c
+++ b/drivers/mtd/mtdpstore.c
@@ -423,6 +423,9 @@ static void mtdpstore_notify_add(struct mtd_info *mtd)
 	longcnt = BITS_TO_LONGS(div_u64(mtd->size, mtd->erasesize));
 	cxt->badmap = kcalloc(longcnt, sizeof(long), GFP_KERNEL);
 
+	if (!cxt->rmmap || !cxt->usedmap || !cxt->badmap)
+		return;
+
 	/* just support dmesg right now */
 	cxt->dev.flags = PSTORE_FLAGS_DMESG;
 	cxt->dev.zone.read = mtdpstore_read;