linux-kernel - [PATCH 5.4 023/183] nbd: null check for nla_nest

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Message-ID: <20240324234638.1355609-24-sashal@kernel.org>
Date: Sun, 24 Mar 2024 19:43:56 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Navid Emamdoost <navid.emamdoost@...il.com>,
	Michal Kubecek <mkubecek@...e.cz>,
	Kees Cook <keescook@...omium.org>,
	Jens Axboe <axboe@...nel.dk>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 023/183] nbd: null check for nla_nest_start

From: Navid Emamdoost <navid.emamdoost@...il.com>

[ Upstream commit 31edf4bbe0ba27fd03ac7d87eb2ee3d2a231af6d ]

nla_nest_start() may fail and return NULL. Insert a check and set errno
based on other call sites within the same source code.

Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
Reviewed-by: Michal Kubecek <mkubecek@...e.cz>
Fixes: 47d902b90a32 ("nbd: add a status netlink command")
Signed-off-by: Kees Cook <keescook@...omium.org>
Link: https://lore.kernel.org/r/20240218042534.it.206-kees@kernel.org
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/block/nbd.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 37994a7a1b6f4..f2d847ffcbc75 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -2313,6 +2313,12 @@ static int nbd_genl_status(struct sk_buff *skb, struct genl_info *info)
 	}
 
 	dev_list = nla_nest_start_noflag(reply, NBD_ATTR_DEVICE_LIST);
+	if (!dev_list) {
+		nlmsg_free(reply);
+		ret = -EMSGSIZE;
+		goto out;
+	}
+
 	if (index == -1) {
 		ret = idr_for_each(&nbd_index_idr, &status_cb, reply);
 		if (ret) {
-- 
2.43.0