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Date: Thu, 9 Sep 2021 12:32:38 +0800
From: Xiyu Yang <xiyuyang19@...an.edu.cn>
To: Trond Myklebust <trond.myklebust@...merspace.com>,
Anna Schumaker <anna.schumaker@...app.com>,
"J. Bruce Fields" <bfields@...ldses.org>,
Chuck Lever <chuck.lever@...cle.com>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>, linux-nfs@...r.kernel.org,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: yuanxzhang@...an.edu.cn, Xiyu Yang <xiyuyang19@...an.edu.cn>,
Xin Xiong <xiongx18@...an.edu.cn>,
Xin Tan <tanxin.ctf@...il.com>
Subject: [PATCH] net/sunrpc: fix reference count leaks in rpc_sysfs_xprt_state_change
The refcount leak issues take place in an error handling path. When the
3rd argument buf doesn't match with "offline", "online" or "remove", the
function simply returns -EINVAL and forgets to decrease the reference
count of a rpc_xprt object and a rpc_xprt_switch object increased by
rpc_sysfs_xprt_kobj_get_xprt() and
rpc_sysfs_xprt_kobj_get_xprt_switch(), causing reference count leaks of
both unused objects.
Fix this issue by jumping to the error handling path labelled with
out_put when buf matches none of "offline", "online" or "remove".
Signed-off-by: Xiyu Yang <xiyuyang19@...an.edu.cn>
Signed-off-by: Xin Xiong <xiongx18@...an.edu.cn>
Signed-off-by: Xin Tan <tanxin.ctf@...il.com>
---
net/sunrpc/sysfs.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/net/sunrpc/sysfs.c b/net/sunrpc/sysfs.c
index 64da3bfd28e6..0cce0375107f 100644
--- a/net/sunrpc/sysfs.c
+++ b/net/sunrpc/sysfs.c
@@ -265,8 +265,10 @@ static ssize_t rpc_sysfs_xprt_state_change(struct kobject *kobj,
online = 1;
else if (!strncmp(buf, "remove", 6))
remove = 1;
- else
- return -EINVAL;
+ else {
+ count = -EINVAL;
+ goto out_put;
+ }
if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE)) {
count = -EINTR;
--
2.7.4
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