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| author | Xiyu Yang <xiyuyang19@fudan.edu.cn> | 2020-05-25 22:15:41 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-06-25 15:32:51 +0200 |
| commit | 22c721560ef24003bcb9c3d9c358841dcfa4e212 (patch) | |
| tree | 0cd35cccd02952a2a2c3efb102c8678eee50b1d2 | |
| parent | 4b2f2a38ede683b1d19a352639776238a907d920 (diff) | |
| download | linux-stable-22c721560ef24003bcb9c3d9c358841dcfa4e212.tar.gz linux-stable-22c721560ef24003bcb9c3d9c358841dcfa4e212.tar.bz2 linux-stable-22c721560ef24003bcb9c3d9c358841dcfa4e212.zip | |
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>
| -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 ebbb0285addb..7ee417b685e9 100644 --- a/fs/nfsd/nfs4callback.c +++ b/fs/nfsd/nfs4callback.c @@ -1149,6 +1149,8 @@ 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; } } |