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authorJ. Bruce Fields <bfields@redhat.com>2016-03-02 16:36:21 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-04-12 09:09:03 -0700
commit56fb92d684cc51baf3a421a3ac19af441a52f413 (patch)
treeb427f6ac37fe735c3b3595ec395b14c61fc48701 /fs/nfsd
parent9ef1ecc409b1e1113bf5e4b6bdd47137e5f9cebb (diff)
nfsd: fix deadlock secinfo+readdir compound
commit 2f6fc056e899bd0144a08da5cacaecbe8997cd74 upstream. nfsd_lookup_dentry exits with the parent filehandle locked. fh_put also unlocks if necessary (nfsd filehandle locking is probably too lenient), so it gets unlocked eventually, but if the following op in the compound needs to lock it again, we can deadlock. A fuzzer ran into this; normal clients don't send a secinfo followed by a readdir in the same compound. Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/nfsd')
-rw-r--r--fs/nfsd/nfs4proc.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index a9f096c7e99f..7d5351cd67fb 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -877,6 +877,7 @@ nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
&exp, &dentry);
if (err)
return err;
+ fh_unlock(&cstate->current_fh);
if (d_really_is_negative(dentry)) {
exp_put(exp);
err = nfserr_noent;