[PATCH v4] nbd: Fix memory leak in nbd_add_socket

* [PATCH v4] nbd: Fix memory leak in nbd_add_socket
@ 2020-06-29  1:23 Zheng Bin
  2020-07-08 20:32 ` Eric Biggers
  2020-07-08 21:42 ` Jens Axboe
  0 siblings, 2 replies; 3+ messages in thread
From: Zheng Bin @ 2020-06-29  1:23 UTC (permalink / raw)
  To: mchristi, ebiggers, josef, axboe, navid.emamdoost, linux-block,
	nbd, linux-kernel
  Cc: yi.zhang, zhengbin13

When adding first socket to nbd, if nsock's allocation failed, the data
structure member "config->socks" was reallocated, but the data structure
member "config->num_connections" was not updated. A memory leak will occur
then because the function "nbd_config_put" will free "config->socks" only
when "config->num_connections" is not zero.

Fixes: 03bf73c315ed ("nbd: prevent memory leak")
Reported-by: syzbot+934037347002901b8d2a@syzkaller.appspotmail.com
Signed-off-by: Zheng Bin <zhengbin13@huawei.com>
---

v1->v2: improve change description
v2->v3: fix some code style issues, improve change description
v3->v4: add "Reported-by" tag

 drivers/block/nbd.c | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 01794cd2b6ca..3ff4054d6834 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -1036,25 +1036,26 @@ static int nbd_add_socket(struct nbd_device *nbd, unsigned long arg,
 	     test_bit(NBD_RT_BOUND, &config->runtime_flags))) {
 		dev_err(disk_to_dev(nbd->disk),
 			"Device being setup by another task");
-		sockfd_put(sock);
-		return -EBUSY;
+		err = -EBUSY;
+		goto put_socket;
+	}
+
+	nsock = kzalloc(sizeof(*nsock), GFP_KERNEL);
+	if (!nsock) {
+		err = -ENOMEM;
+		goto put_socket;
 	}

 	socks = krealloc(config->socks, (config->num_connections + 1) *
 			 sizeof(struct nbd_sock *), GFP_KERNEL);
 	if (!socks) {
-		sockfd_put(sock);
-		return -ENOMEM;
+		kfree(nsock);
+		err = -ENOMEM;
+		goto put_socket;
 	}

 	config->socks = socks;

-	nsock = kzalloc(sizeof(struct nbd_sock), GFP_KERNEL);
-	if (!nsock) {
-		sockfd_put(sock);
-		return -ENOMEM;
-	}
-
 	nsock->fallback_index = -1;
 	nsock->dead = false;
 	mutex_init(&nsock->tx_lock);
@@ -1066,6 +1067,10 @@ static int nbd_add_socket(struct nbd_device *nbd, unsigned long arg,
 	atomic_inc(&config->live_connections);

 	return 0;
+
+put_socket:
+	sockfd_put(sock);
+	return err;
 }

 static int nbd_reconnect_socket(struct nbd_device *nbd, unsigned long arg)
--
2.26.0.106.g9fadedd


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