linux-kernel - [PATCH 2/3] nfsd: fix refcount leak when file is unhashed after being found

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Message-Id: <20240710-nfsd-next-v1-2-21fca616ac53@kernel.org>
Date: Wed, 10 Jul 2024 09:05:32 -0400
From: Jeff Layton <jlayton@...nel.org>
To: Chuck Lever <chuck.lever@...cle.com>, Neil Brown <neilb@...e.de>, 
 Olga Kornievskaia <kolga@...app.com>, Dai Ngo <Dai.Ngo@...cle.com>, 
 Tom Talpey <tom@...pey.com>
Cc: Youzhong Yang <youzhong@...il.com>, linux-nfs@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Jeff Layton <jlayton@...nel.org>
Subject: [PATCH 2/3] nfsd: fix refcount leak when file is unhashed after
 being found

If we wait_for_construction and find that the file is no longer hashed,
and we're going to retry the open, the old nfsd_file reference is
currently leaked. Put the reference before retrying.

Fixes: c6593366c0bf ("nfsd: don't kill nfsd_files because of lease break error")
Signed-off-by: Jeff Layton <jlayton@...nel.org>
---
 fs/nfsd/filecache.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c
index 4fb5e8546831..52063f2cf0df 100644
--- a/fs/nfsd/filecache.c
+++ b/fs/nfsd/filecache.c
@@ -1056,6 +1056,7 @@ nfsd_file_do_acquire(struct svc_rqst *rqstp, struct svc_fh *fhp,
 			status = nfserr_jukebox;
 			goto construction_err;
 		}
+		nfsd_file_put(nf);
 		open_retry = false;
 		fh_put(fhp);
 		goto retry;

-- 
2.45.2