nfsd4: fix nfs4 stateid leak
commit cf9182e90b2af04245ac4fae497fe73fc71285b4 upstream.
Processes that open and close multiple files may end up setting this
oo_last_closed_stid without freeing what was previously pointed to.
This can result in a major leak, visible for example by watching the
nfsd4_stateids line of /proc/slabinfo.
Reported-by: Cyril B. <cbay@excellency.fr>
Tested-by: Cyril B. <cbay@excellency.fr>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index e79c24e..a2f99d1 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -3783,6 +3783,7 @@
memcpy(&close->cl_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
nfsd4_close_open_stateid(stp);
+ release_last_closed_stateid(oo);
oo->oo_last_closed_stid = stp;
/* place unused nfs4_stateowners on so_close_lru list to be