NFSD: Avoid calling OPDESC() with ops->opnum == OP_ILLEGAL

OPDESC() simply indexes into nfsd4_ops[] by the op's operation
number, without range checking that value. It assumes callers are
careful to avoid calling it with an out-of-bounds opnum value.

nfsd4_decode_compound() is not so careful, and can invoke OPDESC()
with opnum set to OP_ILLEGAL, which is 10044 -- well beyond the end
of nfsd4_ops[].

Reported-by: Jeff Layton <jlayton@kernel.org>
Fixes: f4f9ef4a1b0a ("nfsd4: opdesc will be useful outside nfs4proc.c")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 97edb32..67bbd2d 100644 (file)
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -2476,10 +2476,12 @@ nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
        for (i = 0; i < argp->opcnt; i++) {
                op = &argp->ops[i];
                op->replay = NULL;
+               op->opdesc = NULL;
 
                if (xdr_stream_decode_u32(argp->xdr, &op->opnum) < 0)
                        return false;
                if (nfsd4_opnum_in_range(argp, op)) {
+                       op->opdesc = OPDESC(op);
                        op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
                        if (op->status != nfs_ok)
                                trace_nfsd_compound_decode_err(argp->rqstp,
@@ -2490,7 +2492,7 @@ nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
                        op->opnum = OP_ILLEGAL;
                        op->status = nfserr_op_illegal;
                }
-               op->opdesc = OPDESC(op);
+
                /*
                 * We'll try to cache the result in the DRC if any one
                 * op in the compound wants to be cached: