linux-kernel - [PATCH 3.16 038/129] mtd: docg3: Fix kasprintf() usage

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Date:   Sun, 07 Jul 2019 17:54:17 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Richard Weinberger" <richard@....at>,
        "Brian Norris" <computersforpeace@...il.com>
Subject: [PATCH 3.16 038/129] mtd: docg3: Fix kasprintf() usage

3.16.70-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Richard Weinberger <richard@....at>

commit 0eb8618bd07533f423fed47399a0d6387bfe7cac upstream.

kasprintf() does a dynamic memory allocation and can fail.
We have to handle that case.

Signed-off-by: Richard Weinberger <richard@....at>
Signed-off-by: Brian Norris <computersforpeace@...il.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/mtd/devices/docg3.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

--- a/drivers/mtd/devices/docg3.c
+++ b/drivers/mtd/devices/docg3.c
@@ -1822,7 +1822,7 @@ static void __exit doc_dbg_unregister(st
  * @chip_id: The chip ID of the supported chip
  * @mtd: The structure to fill
  */
-static void __init doc_set_driver_info(int chip_id, struct mtd_info *mtd)
+static int __init doc_set_driver_info(int chip_id, struct mtd_info *mtd)
 {
 	struct docg3 *docg3 = mtd->priv;
 	int cfg;
@@ -1835,6 +1835,8 @@ static void __init doc_set_driver_info(i
 	case DOC_CHIPID_G3:
 		mtd->name = kasprintf(GFP_KERNEL, "docg3.%d",
 				      docg3->device_id);
+		if (!mtd->name)
+			return -ENOMEM;
 		docg3->max_block = 2047;
 		break;
 	}
@@ -1857,6 +1859,8 @@ static void __init doc_set_driver_info(i
 	mtd->_block_isbad = doc_block_isbad;
 	mtd->ecclayout = &docg3_oobinfo;
 	mtd->ecc_strength = DOC_ECC_BCH_T;
+
+	return 0;
 }
 
 /**
@@ -1920,7 +1924,9 @@ doc_probe_device(struct docg3_cascade *c
 		goto nomem4;
 	}
 
-	doc_set_driver_info(chip_id, mtd);
+	ret = doc_set_driver_info(chip_id, mtd);
+	if (ret)
+		goto nomem4;
 
 	doc_hamming_ecc_init(docg3, DOC_LAYOUT_OOB_PAGEINFO_SZ);
 	doc_reload_bbt(docg3);