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| author | Xiyu Yang <xiyuyang19@fudan.edu.cn> | 2020-05-25 17:15:41 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-06-24 18:50:17 +0300 |
| commit | e8cac2e3067e8587f8271c2177cc5ca924a61b54 (patch) | |
| tree | 24fb444944f400928f8d84a45441bda096b8fb5a /fs/nfsd | |
| parent | db686568ae52f9c17f48a1a7d4d5c5d4a18c9d71 (diff) | |
| download | linux-e8cac2e3067e8587f8271c2177cc5ca924a61b54.tar.xz | |
nfsd: Fix svc_xprt refcnt leak when setup callback client failed
[ Upstream commit a4abc6b12eb1f7a533c2e7484cfa555454ff0977 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'fs/nfsd')
| -rw-r--r-- | fs/nfsd/nfs4callback.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c index afca3287184b..efe55d101b0e 100644 --- a/fs/nfsd/nfs4callback.c +++ b/fs/nfsd/nfs4callback.c @@ -1230,6 +1230,8 @@ 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; } } |