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nfsd: Fix svc_xprt refcnt leak when setup callback client failed 

nfsd4_process_cb_update() invokes svc_xprt_get(), which increases the
refcount of the "c->cn_xprt".

The reference counting issue happens in one exception handling path of
nfsd4_process_cb_update(). When setup callback client failed, the
function forgets to decrease the refcnt increased by svc_xprt_get(),
causing a refcnt leak.

Fix this issue by calling svc_xprt_put() when setup callback client
failed.

Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Signed-off-by: Xin Tan <tanxin.ctf@gmail.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Xiyu Yang 2020-05-25 22:15:41 +08:00 committed by J. Bruce Fields
parent 24c5efe41c
commit a4abc6b12e
1 changed files with 2 additions and 0 deletions
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2
fs/nfsd/nfs4callback.c
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@ -1306,6 +1306,8 @@ static void nfsd4_process_cb_update(struct nfsd4_callback *cb)
err = setup_callback_client(clp, &conn, ses);
if (err) {
nfsd4_mark_cb_down(clp, err);
if (c)
svc_xprt_put(c->cn_xprt);
return;
}
}