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NFS4: Fix use-after-free in trace_event_raw_event_nfs4_set_lock 

commit 3d1a90ab0e upstream.

It is only safe to call the tracepoint before rpc_put_task() because
'data' is freed inside nfs4_lock_release (rpc_release).

Fixes: 48c9579a1a ("Adding stateid information to tracepoints")
Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Dave Wysochanski 2020-12-11 05:12:51 -05:00 committed by Greg Kroah-Hartman
parent c70f6e0ac9
commit 69d121ca89
1 changed files with 1 additions and 1 deletions
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2
fs/nfs/nfs4proc.c
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@ -6959,9 +6959,9 @@ static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *f
data->arg.new_lock_owner, ret);
} else
data->cancelled = true;
trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
rpc_put_task(task);
dprintk("%s: done, ret = %d!\n", __func__, ret);
trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
return ret;
}