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| author | J. Bruce Fields <bfields@redhat.com> | 2011-03-24 22:51:14 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-04-14 13:02:40 -0700 |
| commit | 39932bd2baf36a8521b89795ac21efbec7e0d976 (patch) | |
| tree | 1860906c3d78d6fd6ae577aade1fe9298fb094a9 /fs | |
| parent | 6fc45e2d18e042ac3d7677fcec64e2f0308f8b5f (diff) | |
| download | lwn-39932bd2baf36a8521b89795ac21efbec7e0d976.tar.gz lwn-39932bd2baf36a8521b89795ac21efbec7e0d976.zip | |
nfsd: fix auth_domain reference leak on nlm operations
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 <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/nfsd/lockd.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/fs/nfsd/lockd.c b/fs/nfsd/lockd.c index 0c6d81670137..7c831a2731fa 100644 --- a/fs/nfsd/lockd.c +++ b/fs/nfsd/lockd.c @@ -38,7 +38,6 @@ nlm_fopen(struct svc_rqst *rqstp, struct nfs_fh *f, struct file **filp) exp_readlock(); nfserr = nfsd_open(rqstp, &fh, S_IFREG, NFSD_MAY_LOCK, filp); fh_put(&fh); - rqstp->rq_client = NULL; exp_readunlock(); /* We return nlm error codes as nlm doesn't know * about nfsd, but nfsd does know about nlm.. |