linux-kernel - [PATCH] block: nbd: fix a missing check for nla_nest

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Date:   Fri, 15 Mar 2019 01:31:38 -0500
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Josef Bacik <josef@...icpanda.com>,
        Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        nbd@...er.debian.org, linux-kernel@...r.kernel.org
Subject: [PATCH] block: nbd: fix a missing check for nla_nest_start

nla_nest_start may fail and thus deserves a check.

The fix inserts such a check and exits gracefully in case it
fails.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/block/nbd.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 7c9a949e876b..810c8c20b142 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -2099,6 +2099,10 @@ static int nbd_genl_status(struct sk_buff *skb, struct genl_info *info)
 	}
 
 	dev_list = nla_nest_start(reply, NBD_ATTR_DEVICE_LIST);
+	if (!dev_list) {
+		nlmsg_free(reply);
+		goto out;
+	}
 	if (index == -1) {
 		ret = idr_for_each(&nbd_index_idr, &status_cb, reply);
 		if (ret) {
-- 
2.17.1