From: Xiyu Yang xiyuyang19@fudan.edu.cn
[ 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 --- fs/nfsd/nfs4callback.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c index 4fa3f0ba9ab3c..0a0b41071ed77 100644 --- a/fs/nfsd/nfs4callback.c +++ b/fs/nfsd/nfs4callback.c @@ -1096,6 +1096,8 @@ 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; } }