From: Navid Emamdoost <navid.emamdoost@gmail.com>
Date: Mon, 23 Sep 2019 20:09:58 +0000 (-0500)
Subject: nbd: prevent memory leak
X-Git-Tag: v5.3.14~46
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0f7f699019ddc3bee6d180c0de839ee6e89945bf;p=thirdparty%2Fkernel%2Fstable.git

nbd: prevent memory leak

commit 03bf73c315edca28f47451913177e14cd040a216 upstream.

In nbd_add_socket when krealloc succeeds, if nsock's allocation fail the
reallocted memory is leak. The correct behaviour should be assigning the
reallocted memory to config->socks right after success.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 1406331896303..f4140f0773246 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -995,14 +995,15 @@ static int nbd_add_socket(struct nbd_device *nbd, unsigned long arg,
 		sockfd_put(sock);
 		return -ENOMEM;
 	}
+
+	config->socks = socks;
+
 	nsock = kzalloc(sizeof(struct nbd_sock), GFP_KERNEL);
 	if (!nsock) {
 		sockfd_put(sock);
 		return -ENOMEM;
 	}
 
-	config->socks = socks;
-
 	nsock->fallback_index = -1;
 	nsock->dead = false;
 	mutex_init(&nsock->tx_lock);