linux-kernel - [PATCH 3.18 039/121] block: fix an error code in add

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Date:   Wed, 11 Apr 2018 20:35:42 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Jens Axboe <axboe@...com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 3.18 039/121] block: fix an error code in add_partition()

3.18-stable review patch.  If anyone has any objections, please let me know.

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

From: Dan Carpenter <dan.carpenter@...cle.com>


[ Upstream commit 7bd897cfce1eb373892d35d7f73201b0f9b221c4 ]

We don't set an error code on this path.  It means that we return NULL
instead of an error pointer and the caller does a NULL dereference.

Fixes: 6d1d8050b4bc ("block, partition: add partition_meta_info to hd_struct")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Jens Axboe <axboe@...com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 block/partition-generic.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/block/partition-generic.c
+++ b/block/partition-generic.c
@@ -309,8 +309,10 @@ struct hd_struct *add_partition(struct g
 
 	if (info) {
 		struct partition_meta_info *pinfo = alloc_part_info(disk);
-		if (!pinfo)
+		if (!pinfo) {
+			err = -ENOMEM;
 			goto out_free_stats;
+		}
 		memcpy(pinfo, info, sizeof(*info));
 		p->info = pinfo;
 	}