blob: 5dfdaf26413abd8cf4f9639d71cbf4728b623013 [file] [log] [blame]
From 954032d2527f2fce7355ba70709b5e143d6b686f Mon Sep 17 00:00:00 2001
From: J. Bruce Fields <>
Date: Thu, 24 Mar 2011 22:51:14 -0400
Subject: nfsd: fix auth_domain reference leak on nlm operations
From: J. Bruce Fields <>
commit 954032d2527f2fce7355ba70709b5e143d6b686f upstream.
This was noticed by users who performed more than 2^32 lock operations
and hence made this counter overflow (eventually leading to
use-after-free's). Setting rq_client to NULL here means that it won't
later get auth_domain_put() when it should be.
Appears to have been introduced in 2.5.42 by "[PATCH] kNFSd: Move auth
domain lookup into svcauth" which moved most of the rq_client handling
to common svcauth code, but left behind this one line.
Cc: Neil Brown <>
Signed-off-by: J. Bruce Fields <>
Signed-off-by: Greg Kroah-Hartman <>
fs/nfsd/lockd.c | 1 -
1 file changed, 1 deletion(-)
--- a/fs/nfsd/lockd.c
+++ b/fs/nfsd/lockd.c
@@ -38,7 +38,6 @@ nlm_fopen(struct svc_rqst *rqstp, struct
nfserr = nfsd_open(rqstp, &fh, S_IFREG, NFSD_MAY_LOCK, filp);
- rqstp->rq_client = NULL;
/* We return nlm error codes as nlm doesn't know
* about nfsd, but nfsd does know about nlm..