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Sender: Anna Schumaker <schumakeranna@gmail.com>
From:   schumaker.anna@gmail.com
To:     Trond.Myklebust@hammerspace.com, linux-nfs@vger.kernel.org
Cc:     Anna.Schumaker@Netapp.com
Subject: [PATCH v2] SUNRPC: Check if the xprt is connected before handling sysfs reads
Date:   Thu, 28 Oct 2021 15:17:41 -0400
Message-Id: <20211028191741.167215-1-Anna.Schumaker@Netapp.com>
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From: Anna Schumaker <Anna.Schumaker@Netapp.com>

xprts don't immediately reconnect when changing the "dstaddr" property,
instead this gets handled the next time an operation uses the transport.
This could lead to NULL pointer dereferences when trying to read sysfs
files between the disconnect and reconnect operations. Fix this by
returning an error if the xprt is not connected.

Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
---
v2: Call xprt_put() on the xprt before returning
---
 net/sunrpc/sysfs.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/net/sunrpc/sysfs.c b/net/sunrpc/sysfs.c
index 9a6f17e18f73..2766dd21935b 100644
--- a/net/sunrpc/sysfs.c
+++ b/net/sunrpc/sysfs.c
@@ -109,8 +109,10 @@ static ssize_t rpc_sysfs_xprt_srcaddr_show(struct kobject *kobj,
 	struct sock_xprt *sock;
 	ssize_t ret = -1;
 
-	if (!xprt)
-		return 0;
+	if (!xprt || !xprt_connected(xprt)) {
+		xprt_put(xprt);
+		return -ENOTCONN;
+	}
 
 	sock = container_of(xprt, struct sock_xprt, xprt);
 	if (kernel_getsockname(sock->sock, (struct sockaddr *)&saddr) < 0)
@@ -129,8 +131,10 @@ static ssize_t rpc_sysfs_xprt_info_show(struct kobject *kobj,
 	struct rpc_xprt *xprt = rpc_sysfs_xprt_kobj_get_xprt(kobj);
 	ssize_t ret;
 
-	if (!xprt)
-		return 0;
+	if (!xprt || !xprt_connected(xprt)) {
+		xprt_put(xprt);
+		return -ENOTCONN;
+	}
 
 	ret = sprintf(buf, "last_used=%lu\ncur_cong=%lu\ncong_win=%lu\n"
 		       "max_num_slots=%u\nmin_num_slots=%u\nnum_reqs=%u\n"
-- 
2.33.1